visualizer
/
vendor
/
phpoffice
/
phpspreadsheet
/
src
/
PhpSpreadsheet
/
Calculation
/
Database.php
Database.php in Visualizer – Tables & Charts Manager with Built-in AI Generator 3.10.8, at vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Database.php
| 1 | <?php |
| 2 | |
| 3 | namespace PhpOffice\PhpSpreadsheet\Calculation; |
| 4 | |
| 5 | class Database |
| 6 | { |
| 7 | /** |
| 8 | * fieldExtract. |
| 9 | * |
| 10 | * Extracts the column ID to use for the data field. |
| 11 | * |
| 12 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 13 | * A database is a list of related data in which rows of related |
| 14 | * information are records, and columns of data are fields. The |
| 15 | * first row of the list contains labels for each column. |
| 16 | * @param mixed $field Indicates which column is used in the function. Enter the |
| 17 | * column label enclosed between double quotation marks, such as |
| 18 | * "Age" or "Yield," or a number (without quotation marks) that |
| 19 | * represents the position of the column within the list: 1 for |
| 20 | * the first column, 2 for the second column, and so on. |
| 21 | * |
| 22 | * @return null|string |
| 23 | */ |
| 24 | private static function fieldExtract($database, $field) |
| 25 | { |
| 26 | $field = strtoupper(Functions::flattenSingleValue($field)); |
| 27 | $fieldNames = array_map('strtoupper', array_shift($database)); |
| 28 | |
| 29 | if (is_numeric($field)) { |
| 30 | $keys = array_keys($fieldNames); |
| 31 | |
| 32 | return $keys[$field - 1]; |
| 33 | } |
| 34 | $key = array_search($field, $fieldNames); |
| 35 | |
| 36 | return ($key) ? $key : null; |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * filter. |
| 41 | * |
| 42 | * Parses the selection criteria, extracts the database rows that match those criteria, and |
| 43 | * returns that subset of rows. |
| 44 | * |
| 45 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 46 | * A database is a list of related data in which rows of related |
| 47 | * information are records, and columns of data are fields. The |
| 48 | * first row of the list contains labels for each column. |
| 49 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 50 | * You can use any range for the criteria argument, as long as it |
| 51 | * includes at least one column label and at least one cell below |
| 52 | * the column label in which you specify a condition for the |
| 53 | * column. |
| 54 | * |
| 55 | * @return array of mixed |
| 56 | */ |
| 57 | private static function filter($database, $criteria) |
| 58 | { |
| 59 | $fieldNames = array_shift($database); |
| 60 | $criteriaNames = array_shift($criteria); |
| 61 | |
| 62 | // Convert the criteria into a set of AND/OR conditions with [:placeholders] |
| 63 | $testConditions = $testValues = []; |
| 64 | $testConditionsCount = 0; |
| 65 | foreach ($criteriaNames as $key => $criteriaName) { |
| 66 | $testCondition = []; |
| 67 | $testConditionCount = 0; |
| 68 | foreach ($criteria as $row => $criterion) { |
| 69 | if ($criterion[$key] > '') { |
| 70 | $testCondition[] = '[:' . $criteriaName . ']' . Functions::ifCondition($criterion[$key]); |
| 71 | ++$testConditionCount; |
| 72 | } |
| 73 | } |
| 74 | if ($testConditionCount > 1) { |
| 75 | $testConditions[] = 'OR(' . implode(',', $testCondition) . ')'; |
| 76 | ++$testConditionsCount; |
| 77 | } elseif ($testConditionCount == 1) { |
| 78 | $testConditions[] = $testCondition[0]; |
| 79 | ++$testConditionsCount; |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | if ($testConditionsCount > 1) { |
| 84 | $testConditionSet = 'AND(' . implode(',', $testConditions) . ')'; |
| 85 | } elseif ($testConditionsCount == 1) { |
| 86 | $testConditionSet = $testConditions[0]; |
| 87 | } |
| 88 | |
| 89 | // Loop through each row of the database |
| 90 | foreach ($database as $dataRow => $dataValues) { |
| 91 | // Substitute actual values from the database row for our [:placeholders] |
| 92 | $testConditionList = $testConditionSet; |
| 93 | foreach ($criteriaNames as $key => $criteriaName) { |
| 94 | $k = array_search($criteriaName, $fieldNames); |
| 95 | if (isset($dataValues[$k])) { |
| 96 | $dataValue = $dataValues[$k]; |
| 97 | $dataValue = (is_string($dataValue)) ? Calculation::wrapResult(strtoupper($dataValue)) : $dataValue; |
| 98 | $testConditionList = str_replace('[:' . $criteriaName . ']', $dataValue, $testConditionList); |
| 99 | } |
| 100 | } |
| 101 | // evaluate the criteria against the row data |
| 102 | $result = Calculation::getInstance()->_calculateFormulaValue('=' . $testConditionList); |
| 103 | // If the row failed to meet the criteria, remove it from the database |
| 104 | if (!$result) { |
| 105 | unset($database[$dataRow]); |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | return $database; |
| 110 | } |
| 111 | |
| 112 | private static function getFilteredColumn($database, $field, $criteria) |
| 113 | { |
| 114 | // reduce the database to a set of rows that match all the criteria |
| 115 | $database = self::filter($database, $criteria); |
| 116 | // extract an array of values for the requested column |
| 117 | $colData = []; |
| 118 | foreach ($database as $row) { |
| 119 | $colData[] = $row[$field]; |
| 120 | } |
| 121 | |
| 122 | return $colData; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * DAVERAGE. |
| 127 | * |
| 128 | * Averages the values in a column of a list or database that match conditions you specify. |
| 129 | * |
| 130 | * Excel Function: |
| 131 | * DAVERAGE(database,field,criteria) |
| 132 | * |
| 133 | * @category Database Functions |
| 134 | * |
| 135 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 136 | * A database is a list of related data in which rows of related |
| 137 | * information are records, and columns of data are fields. The |
| 138 | * first row of the list contains labels for each column. |
| 139 | * @param int|string $field Indicates which column is used in the function. Enter the |
| 140 | * column label enclosed between double quotation marks, such as |
| 141 | * "Age" or "Yield," or a number (without quotation marks) that |
| 142 | * represents the position of the column within the list: 1 for |
| 143 | * the first column, 2 for the second column, and so on. |
| 144 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 145 | * You can use any range for the criteria argument, as long as it |
| 146 | * includes at least one column label and at least one cell below |
| 147 | * the column label in which you specify a condition for the |
| 148 | * column. |
| 149 | * |
| 150 | * @return float |
| 151 | */ |
| 152 | public static function DAVERAGE($database, $field, $criteria) |
| 153 | { |
| 154 | $field = self::fieldExtract($database, $field); |
| 155 | if ($field === null) { |
| 156 | return null; |
| 157 | } |
| 158 | |
| 159 | // Return |
| 160 | return Statistical::AVERAGE( |
| 161 | self::getFilteredColumn($database, $field, $criteria) |
| 162 | ); |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * DCOUNT. |
| 167 | * |
| 168 | * Counts the cells that contain numbers in a column of a list or database that match conditions |
| 169 | * that you specify. |
| 170 | * |
| 171 | * Excel Function: |
| 172 | * DCOUNT(database,[field],criteria) |
| 173 | * |
| 174 | * Excel Function: |
| 175 | * DAVERAGE(database,field,criteria) |
| 176 | * |
| 177 | * @category Database Functions |
| 178 | * |
| 179 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 180 | * A database is a list of related data in which rows of related |
| 181 | * information are records, and columns of data are fields. The |
| 182 | * first row of the list contains labels for each column. |
| 183 | * @param int|string $field Indicates which column is used in the function. Enter the |
| 184 | * column label enclosed between double quotation marks, such as |
| 185 | * "Age" or "Yield," or a number (without quotation marks) that |
| 186 | * represents the position of the column within the list: 1 for |
| 187 | * the first column, 2 for the second column, and so on. |
| 188 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 189 | * You can use any range for the criteria argument, as long as it |
| 190 | * includes at least one column label and at least one cell below |
| 191 | * the column label in which you specify a condition for the |
| 192 | * column. |
| 193 | * |
| 194 | * @return int |
| 195 | * |
| 196 | * @TODO The field argument is optional. If field is omitted, DCOUNT counts all records in the |
| 197 | * database that match the criteria. |
| 198 | */ |
| 199 | public static function DCOUNT($database, $field, $criteria) |
| 200 | { |
| 201 | $field = self::fieldExtract($database, $field); |
| 202 | if ($field === null) { |
| 203 | return null; |
| 204 | } |
| 205 | |
| 206 | // Return |
| 207 | return Statistical::COUNT( |
| 208 | self::getFilteredColumn($database, $field, $criteria) |
| 209 | ); |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * DCOUNTA. |
| 214 | * |
| 215 | * Counts the nonblank cells in a column of a list or database that match conditions that you specify. |
| 216 | * |
| 217 | * Excel Function: |
| 218 | * DCOUNTA(database,[field],criteria) |
| 219 | * |
| 220 | * @category Database Functions |
| 221 | * |
| 222 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 223 | * A database is a list of related data in which rows of related |
| 224 | * information are records, and columns of data are fields. The |
| 225 | * first row of the list contains labels for each column. |
| 226 | * @param int|string $field Indicates which column is used in the function. Enter the |
| 227 | * column label enclosed between double quotation marks, such as |
| 228 | * "Age" or "Yield," or a number (without quotation marks) that |
| 229 | * represents the position of the column within the list: 1 for |
| 230 | * the first column, 2 for the second column, and so on. |
| 231 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 232 | * You can use any range for the criteria argument, as long as it |
| 233 | * includes at least one column label and at least one cell below |
| 234 | * the column label in which you specify a condition for the |
| 235 | * column. |
| 236 | * |
| 237 | * @return int |
| 238 | * |
| 239 | * @TODO The field argument is optional. If field is omitted, DCOUNTA counts all records in the |
| 240 | * database that match the criteria. |
| 241 | */ |
| 242 | public static function DCOUNTA($database, $field, $criteria) |
| 243 | { |
| 244 | $field = self::fieldExtract($database, $field); |
| 245 | if ($field === null) { |
| 246 | return null; |
| 247 | } |
| 248 | |
| 249 | // reduce the database to a set of rows that match all the criteria |
| 250 | $database = self::filter($database, $criteria); |
| 251 | // extract an array of values for the requested column |
| 252 | $colData = []; |
| 253 | foreach ($database as $row) { |
| 254 | $colData[] = $row[$field]; |
| 255 | } |
| 256 | |
| 257 | // Return |
| 258 | return Statistical::COUNTA( |
| 259 | self::getFilteredColumn($database, $field, $criteria) |
| 260 | ); |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * DGET. |
| 265 | * |
| 266 | * Extracts a single value from a column of a list or database that matches conditions that you |
| 267 | * specify. |
| 268 | * |
| 269 | * Excel Function: |
| 270 | * DGET(database,field,criteria) |
| 271 | * |
| 272 | * @category Database Functions |
| 273 | * |
| 274 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 275 | * A database is a list of related data in which rows of related |
| 276 | * information are records, and columns of data are fields. The |
| 277 | * first row of the list contains labels for each column. |
| 278 | * @param int|string $field Indicates which column is used in the function. Enter the |
| 279 | * column label enclosed between double quotation marks, such as |
| 280 | * "Age" or "Yield," or a number (without quotation marks) that |
| 281 | * represents the position of the column within the list: 1 for |
| 282 | * the first column, 2 for the second column, and so on. |
| 283 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 284 | * You can use any range for the criteria argument, as long as it |
| 285 | * includes at least one column label and at least one cell below |
| 286 | * the column label in which you specify a condition for the |
| 287 | * column. |
| 288 | * |
| 289 | * @return mixed |
| 290 | */ |
| 291 | public static function DGET($database, $field, $criteria) |
| 292 | { |
| 293 | $field = self::fieldExtract($database, $field); |
| 294 | if ($field === null) { |
| 295 | return null; |
| 296 | } |
| 297 | |
| 298 | // Return |
| 299 | $colData = self::getFilteredColumn($database, $field, $criteria); |
| 300 | if (count($colData) > 1) { |
| 301 | return Functions::NAN(); |
| 302 | } |
| 303 | |
| 304 | return $colData[0]; |
| 305 | } |
| 306 | |
| 307 | /** |
| 308 | * DMAX. |
| 309 | * |
| 310 | * Returns the largest number in a column of a list or database that matches conditions you that |
| 311 | * specify. |
| 312 | * |
| 313 | * Excel Function: |
| 314 | * DMAX(database,field,criteria) |
| 315 | * |
| 316 | * @category Database Functions |
| 317 | * |
| 318 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 319 | * A database is a list of related data in which rows of related |
| 320 | * information are records, and columns of data are fields. The |
| 321 | * first row of the list contains labels for each column. |
| 322 | * @param int|string $field Indicates which column is used in the function. Enter the |
| 323 | * column label enclosed between double quotation marks, such as |
| 324 | * "Age" or "Yield," or a number (without quotation marks) that |
| 325 | * represents the position of the column within the list: 1 for |
| 326 | * the first column, 2 for the second column, and so on. |
| 327 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 328 | * You can use any range for the criteria argument, as long as it |
| 329 | * includes at least one column label and at least one cell below |
| 330 | * the column label in which you specify a condition for the |
| 331 | * column. |
| 332 | * |
| 333 | * @return float |
| 334 | */ |
| 335 | public static function DMAX($database, $field, $criteria) |
| 336 | { |
| 337 | $field = self::fieldExtract($database, $field); |
| 338 | if ($field === null) { |
| 339 | return null; |
| 340 | } |
| 341 | |
| 342 | // Return |
| 343 | return Statistical::MAX( |
| 344 | self::getFilteredColumn($database, $field, $criteria) |
| 345 | ); |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * DMIN. |
| 350 | * |
| 351 | * Returns the smallest number in a column of a list or database that matches conditions you that |
| 352 | * specify. |
| 353 | * |
| 354 | * Excel Function: |
| 355 | * DMIN(database,field,criteria) |
| 356 | * |
| 357 | * @category Database Functions |
| 358 | * |
| 359 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 360 | * A database is a list of related data in which rows of related |
| 361 | * information are records, and columns of data are fields. The |
| 362 | * first row of the list contains labels for each column. |
| 363 | * @param int|string $field Indicates which column is used in the function. Enter the |
| 364 | * column label enclosed between double quotation marks, such as |
| 365 | * "Age" or "Yield," or a number (without quotation marks) that |
| 366 | * represents the position of the column within the list: 1 for |
| 367 | * the first column, 2 for the second column, and so on. |
| 368 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 369 | * You can use any range for the criteria argument, as long as it |
| 370 | * includes at least one column label and at least one cell below |
| 371 | * the column label in which you specify a condition for the |
| 372 | * column. |
| 373 | * |
| 374 | * @return float |
| 375 | */ |
| 376 | public static function DMIN($database, $field, $criteria) |
| 377 | { |
| 378 | $field = self::fieldExtract($database, $field); |
| 379 | if ($field === null) { |
| 380 | return null; |
| 381 | } |
| 382 | |
| 383 | // Return |
| 384 | return Statistical::MIN( |
| 385 | self::getFilteredColumn($database, $field, $criteria) |
| 386 | ); |
| 387 | } |
| 388 | |
| 389 | /** |
| 390 | * DPRODUCT. |
| 391 | * |
| 392 | * Multiplies the values in a column of a list or database that match conditions that you specify. |
| 393 | * |
| 394 | * Excel Function: |
| 395 | * DPRODUCT(database,field,criteria) |
| 396 | * |
| 397 | * @category Database Functions |
| 398 | * |
| 399 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 400 | * A database is a list of related data in which rows of related |
| 401 | * information are records, and columns of data are fields. The |
| 402 | * first row of the list contains labels for each column. |
| 403 | * @param int|string $field Indicates which column is used in the function. Enter the |
| 404 | * column label enclosed between double quotation marks, such as |
| 405 | * "Age" or "Yield," or a number (without quotation marks) that |
| 406 | * represents the position of the column within the list: 1 for |
| 407 | * the first column, 2 for the second column, and so on. |
| 408 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 409 | * You can use any range for the criteria argument, as long as it |
| 410 | * includes at least one column label and at least one cell below |
| 411 | * the column label in which you specify a condition for the |
| 412 | * column. |
| 413 | * |
| 414 | * @return float |
| 415 | */ |
| 416 | public static function DPRODUCT($database, $field, $criteria) |
| 417 | { |
| 418 | $field = self::fieldExtract($database, $field); |
| 419 | if ($field === null) { |
| 420 | return null; |
| 421 | } |
| 422 | |
| 423 | // Return |
| 424 | return MathTrig::PRODUCT( |
| 425 | self::getFilteredColumn($database, $field, $criteria) |
| 426 | ); |
| 427 | } |
| 428 | |
| 429 | /** |
| 430 | * DSTDEV. |
| 431 | * |
| 432 | * Estimates the standard deviation of a population based on a sample by using the numbers in a |
| 433 | * column of a list or database that match conditions that you specify. |
| 434 | * |
| 435 | * Excel Function: |
| 436 | * DSTDEV(database,field,criteria) |
| 437 | * |
| 438 | * @category Database Functions |
| 439 | * |
| 440 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 441 | * A database is a list of related data in which rows of related |
| 442 | * information are records, and columns of data are fields. The |
| 443 | * first row of the list contains labels for each column. |
| 444 | * @param int|string $field Indicates which column is used in the function. Enter the |
| 445 | * column label enclosed between double quotation marks, such as |
| 446 | * "Age" or "Yield," or a number (without quotation marks) that |
| 447 | * represents the position of the column within the list: 1 for |
| 448 | * the first column, 2 for the second column, and so on. |
| 449 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 450 | * You can use any range for the criteria argument, as long as it |
| 451 | * includes at least one column label and at least one cell below |
| 452 | * the column label in which you specify a condition for the |
| 453 | * column. |
| 454 | * |
| 455 | * @return float |
| 456 | */ |
| 457 | public static function DSTDEV($database, $field, $criteria) |
| 458 | { |
| 459 | $field = self::fieldExtract($database, $field); |
| 460 | if ($field === null) { |
| 461 | return null; |
| 462 | } |
| 463 | |
| 464 | // Return |
| 465 | return Statistical::STDEV( |
| 466 | self::getFilteredColumn($database, $field, $criteria) |
| 467 | ); |
| 468 | } |
| 469 | |
| 470 | /** |
| 471 | * DSTDEVP. |
| 472 | * |
| 473 | * Calculates the standard deviation of a population based on the entire population by using the |
| 474 | * numbers in a column of a list or database that match conditions that you specify. |
| 475 | * |
| 476 | * Excel Function: |
| 477 | * DSTDEVP(database,field,criteria) |
| 478 | * |
| 479 | * @category Database Functions |
| 480 | * |
| 481 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 482 | * A database is a list of related data in which rows of related |
| 483 | * information are records, and columns of data are fields. The |
| 484 | * first row of the list contains labels for each column. |
| 485 | * @param int|string $field Indicates which column is used in the function. Enter the |
| 486 | * column label enclosed between double quotation marks, such as |
| 487 | * "Age" or "Yield," or a number (without quotation marks) that |
| 488 | * represents the position of the column within the list: 1 for |
| 489 | * the first column, 2 for the second column, and so on. |
| 490 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 491 | * You can use any range for the criteria argument, as long as it |
| 492 | * includes at least one column label and at least one cell below |
| 493 | * the column label in which you specify a condition for the |
| 494 | * column. |
| 495 | * |
| 496 | * @return float |
| 497 | */ |
| 498 | public static function DSTDEVP($database, $field, $criteria) |
| 499 | { |
| 500 | $field = self::fieldExtract($database, $field); |
| 501 | if ($field === null) { |
| 502 | return null; |
| 503 | } |
| 504 | |
| 505 | // Return |
| 506 | return Statistical::STDEVP( |
| 507 | self::getFilteredColumn($database, $field, $criteria) |
| 508 | ); |
| 509 | } |
| 510 | |
| 511 | /** |
| 512 | * DSUM. |
| 513 | * |
| 514 | * Adds the numbers in a column of a list or database that match conditions that you specify. |
| 515 | * |
| 516 | * Excel Function: |
| 517 | * DSUM(database,field,criteria) |
| 518 | * |
| 519 | * @category Database Functions |
| 520 | * |
| 521 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 522 | * A database is a list of related data in which rows of related |
| 523 | * information are records, and columns of data are fields. The |
| 524 | * first row of the list contains labels for each column. |
| 525 | * @param int|string $field Indicates which column is used in the function. Enter the |
| 526 | * column label enclosed between double quotation marks, such as |
| 527 | * "Age" or "Yield," or a number (without quotation marks) that |
| 528 | * represents the position of the column within the list: 1 for |
| 529 | * the first column, 2 for the second column, and so on. |
| 530 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 531 | * You can use any range for the criteria argument, as long as it |
| 532 | * includes at least one column label and at least one cell below |
| 533 | * the column label in which you specify a condition for the |
| 534 | * column. |
| 535 | * |
| 536 | * @return float |
| 537 | */ |
| 538 | public static function DSUM($database, $field, $criteria) |
| 539 | { |
| 540 | $field = self::fieldExtract($database, $field); |
| 541 | if ($field === null) { |
| 542 | return null; |
| 543 | } |
| 544 | |
| 545 | // Return |
| 546 | return MathTrig::SUM( |
| 547 | self::getFilteredColumn($database, $field, $criteria) |
| 548 | ); |
| 549 | } |
| 550 | |
| 551 | /** |
| 552 | * DVAR. |
| 553 | * |
| 554 | * Estimates the variance of a population based on a sample by using the numbers in a column |
| 555 | * of a list or database that match conditions that you specify. |
| 556 | * |
| 557 | * Excel Function: |
| 558 | * DVAR(database,field,criteria) |
| 559 | * |
| 560 | * @category Database Functions |
| 561 | * |
| 562 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 563 | * A database is a list of related data in which rows of related |
| 564 | * information are records, and columns of data are fields. The |
| 565 | * first row of the list contains labels for each column. |
| 566 | * @param int|string $field Indicates which column is used in the function. Enter the |
| 567 | * column label enclosed between double quotation marks, such as |
| 568 | * "Age" or "Yield," or a number (without quotation marks) that |
| 569 | * represents the position of the column within the list: 1 for |
| 570 | * the first column, 2 for the second column, and so on. |
| 571 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 572 | * You can use any range for the criteria argument, as long as it |
| 573 | * includes at least one column label and at least one cell below |
| 574 | * the column label in which you specify a condition for the |
| 575 | * column. |
| 576 | * |
| 577 | * @return float |
| 578 | */ |
| 579 | public static function DVAR($database, $field, $criteria) |
| 580 | { |
| 581 | $field = self::fieldExtract($database, $field); |
| 582 | if ($field === null) { |
| 583 | return null; |
| 584 | } |
| 585 | |
| 586 | // Return |
| 587 | return Statistical::VARFunc( |
| 588 | self::getFilteredColumn($database, $field, $criteria) |
| 589 | ); |
| 590 | } |
| 591 | |
| 592 | /** |
| 593 | * DVARP. |
| 594 | * |
| 595 | * Calculates the variance of a population based on the entire population by using the numbers |
| 596 | * in a column of a list or database that match conditions that you specify. |
| 597 | * |
| 598 | * Excel Function: |
| 599 | * DVARP(database,field,criteria) |
| 600 | * |
| 601 | * @category Database Functions |
| 602 | * |
| 603 | * @param mixed[] $database The range of cells that makes up the list or database. |
| 604 | * A database is a list of related data in which rows of related |
| 605 | * information are records, and columns of data are fields. The |
| 606 | * first row of the list contains labels for each column. |
| 607 | * @param int|string $field Indicates which column is used in the function. Enter the |
| 608 | * column label enclosed between double quotation marks, such as |
| 609 | * "Age" or "Yield," or a number (without quotation marks) that |
| 610 | * represents the position of the column within the list: 1 for |
| 611 | * the first column, 2 for the second column, and so on. |
| 612 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
| 613 | * You can use any range for the criteria argument, as long as it |
| 614 | * includes at least one column label and at least one cell below |
| 615 | * the column label in which you specify a condition for the |
| 616 | * column. |
| 617 | * |
| 618 | * @return float |
| 619 | */ |
| 620 | public static function DVARP($database, $field, $criteria) |
| 621 | { |
| 622 | $field = self::fieldExtract($database, $field); |
| 623 | if ($field === null) { |
| 624 | return null; |
| 625 | } |
| 626 | |
| 627 | // Return |
| 628 | return Statistical::VARP( |
| 629 | self::getFilteredColumn($database, $field, $criteria) |
| 630 | ); |
| 631 | } |
| 632 | } |
| 633 |