* Extract Percentile-type functions from Statistics (e.g. PERCENTILE(), PERCENTRANK(), QUARTILE(), and RANK())
* Unit test for PERCENTILE() with an empty (of numbers) dataset
* Difference in variance calculations between Excel/Gnumeric and Open/LibreOffice
* Simplify STDEV() function logic by remembering that STDEV() is simply the square root of VAR(), so we can simply use the VAR() calculaion rather than duplicating the basic logic... and also allow for the differences between Excel/Gnumeric and Open/LibreOffice
* Start implementing Newton-Raphson for the inverse of Statistical Distributions, starting with the two-tailed Student-T
* Additional unit tests and validations
* Use the new Newton Raphson class for calculating the Inverse of ChiSquared
* Extract Weibull distribution, and provide unit tests
* First steps toward refactoring Statistical Distributions into smaller classes: BETA() and GAMMA() (and related functions) to start with... they all need a lot of tidying up, and more testing; but it's a start
* Add basic datatype validations to Beta and Gamma Excel function implementations
* Switch to using a trait with the validation methods to provide easier sharing between distribution classes
* Additional unit tests for Beta and Gamma functions, including unhappy path for validations
* Extract ChiSquared functions
* Additional argument validation checks with unit tests for Chi Squared functions
* Extract Fisher
* Move MEDIAN() and MODE() to the Averages class
* Extract filters for Median and Mode for common usage
- Move TREND() functions into the Statistical Trends class
- Unit tests for TREND()
- Create Confidence class for Statistical Confidence functions, and the CONFIDENCE() method
* Start splitting some of the basic Statistical functions out into separate classes containing just a few similar functions
* Splitting some of the basic Statistical functions out into separate classes containing just a few similar functions - MAX(), MAXA(), MIN() and MINA()
* Splitting some more of the basic Statistical functions out into separate classes containing just a few similar functions - StandardDeviations and Variances
- Refactoring of the Statistical Conditional functions (`AVERAGEIF()`, `AVERAGEIFS()`, `COUNTIF()`, `COUNTIFS()`, `MAXIFS()` and `MINIFS()` to use the new Database functions codebase.
- Extended unit testing
- Fix handling for null values
- Fixes to wildcard text searches
There's still scope for further improvements to memory usage and performance; but for now the code is stable with all unit tests passing
* Extract Permutation functions from the Statistical class into a dedicated Permutations class
Retain the original methods in the Statistical class as stubs for BC, but deprecate them. They will be removed for PHPSpreadsheet v2
Note that unit tests still point to the Statistical class stubs; these should be modified to use the Permutations class directly when the stubs are removed
Also provided a basic implementationof the PERMUTATIONA() Function
* `GAUSS()` and `GAMMA()`, `NORM.S.DIST()`, `LOGNORM.DIST()` and `F.DIST()` function implementations, and further unit tests for a number of the statistical functions
Co-authored-by: Adrien Crivelli <adrien.crivelli@gmail.com>
For functions introduced in Excel 2010 and beyond, Excel saves them
in formulas with the xlfn_ prefix. PhpSpreadsheet does not do this;
as a result, when a spreadsheet so created is opened, the cells
which use the new functions display a #NAME? error.
This the cause of bug report 1246:
https://github.com/PHPOffice/PhpSpreadsheet/issues/1246
This change corrects that problem when the Xlsx writer encounters
a 2010+ formula for a cell or a conditional style. A new class
Writer/Xlsx/Xlfn, with 2 static methods,
is introduced to facilitate this change.
As part of the testing for this, I found some additional problems.
When an unknown function name is used, Excel generates a #NAME? error.
However, when an unknown function is used in PhpSpreadsheet:
- if there are no parameters, it returns #VALUE!, which is wrong
- if there are parameters, it throws an exception, which is horrible
Both of these situations will now return #NAME?
Tests have been added for these situations.
The MODE (and MODE.SNGL) function is not quite in alignment with Excel.
MODE(3, 3, 4, 4) returns 3 in both Excel and PhpSpreadsheet.
However, MODE(4, 3, 3, 4) returns 4 in Excel, but 3 in PhpSpreadsheet.
Both situations will now match Excel's result.
Also, Excel allows its parameters for MODE to be an array,
but PhpSpreadsheet did not; it now will.
There had not been any tests for MODE. Now there are.
The SHEET and SHEETS functions were introduced in Excel 2013,
but were not introduced in PhpSpreadsheet. They are now introduced
as DUMMY functions so that they can be parsed appropriately.
Finally, in common with the "rate" changes for which I am
creating a pull request at the same time as this one:
samples/Basic/13_CalculationCyclicFormulae
PhpUnit started reporting an error like "too much regression".
The test deals with an infinite cyclic formula, and allowed
the calculation engine to run for 100 cycles. The actual number of cycles
seems irrelevant for the purpose of this test. I changed it to 15,
and PhpUnit no longer complains.
* Merge branch 'master' of C:\Projects\PHPOffice\PHPSpreadsheet\develop with conflicts.
* New statistical tests
* Sniffs
* Additional statistical function unit tests
* Additional statistical function unit tests
* Fix case-sensitivity
* Fix HARMEAN code logic
* Unit tests refactored into individual files for all logical functions
Implemented IFNA()
* Fix silly typo
* NOT needs ...args to allow for test when no argument passed
* Codestyle
* Use instance asserts
* Merge branch 'master' of C:\Projects\PHPOffice\PHPSpreadsheet\develop with conflicts.
* Further statistical tests
* Additional BINOMDIST tests
Extract boolean and string checking for Average and Count functions into separate methods
* Appease the great god PHPCS
* Yet more appeasement of the great god PHPCS
* Beginning to get really cheesed off with PHPCS, pulling me up over full stops in comments... I want to see this completed before going to bed; but it's nearly half past one in the morning, and phpcs has been pulling me up over trivialities for the past f***ing hour
* And a spurious line
* Further work on statistical tests
* Merge branch 'master' of C:\Projects\PHPOffice\PHPSpreadsheet\develop with conflicts.
* Adjusted logic for COUNT() function to handle differences in EXCEL, GNUMERIC and OPENOFFICE modes for cells and for literal values
* Fix case-sensitivity in filenames
* Appeasing Codesniffer
* Resolve COUNTA() differences between cell values and literals
* Style fixes
* Start refactoring statistical function tests into individual tests rather than having a single, giant test for all statistical functions.... first step toward doing this for all tests
* More refactoring into separate tests
If all functions have their own individual test files, it should be a lot easier to identify which functions aren't covered by tests yet
* Missing last lines in files
* Merge branch 'master' of C:\Projects\PHPOffice\PHPSpreadsheet\develop with conflicts.
* More trend function unit tests
* Yet more trend function unit tests
* Merge branch 'master' of C:\Projects\PHPOffice\PHPSpreadsheet\develop with conflicts.
* More statistical tests
* Further statistical tests
* Unit tests for some of the trend functions
* resolve scrutiniser objections
* Fix order of @return types :-(
* Merge branch 'master' of C:\Projects\PHPOffice\PHPSpreadsheet\develop with conflicts.
* Additional unit tests for average functions, and fix to AVERAGEIF() function if third argument is passed
* Update change log
* Stricter typed comparisons in AVERAGEIF() conditions
* Unit tests for BETADIST() and BETAINV()
Mark Baker
Adrien Crivelli
Owen Leibman
Zdeněk Drahoš