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  • Bug fixes for general core bugs in 4.0.x will end 8 May 2023 (12 months).
  • Bug fixes for security issues in 4.0.x will end 13 November 2023 (18 months).
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/lib/phpspreadsheet/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Engineering/ -> BesselI.php (source)

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Differences Between: [Versions 400 and 401] [Versions 400 and 402] [Versions 400 and 403]

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File Size: 137 lines (4 kb)
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Includes or requires: 0 files

Defines 1 class

BesselI:: (5 methods):
  BESSELI()
  calculate()
  besselI0()
  besselI1()
  besselI2()


Class: BesselI  - X-Ref

BESSELI($x, $ord)   X-Ref
BESSELI.

Returns the modified Bessel function In(x), which is equivalent to the Bessel function evaluated
for purely imaginary arguments

Excel Function:
BESSELI(x,ord)

NOTE: The MS Excel implementation of the BESSELI function is still not accurate.
This code provides a more accurate calculation

return: float|string Result, or a string containing an error
param: mixed $x A float value at which to evaluate the function.
param: mixed $ord The integer order of the Bessel function.

calculate(float $x, int $ord)   X-Ref
No description

besselI0(float $x)   X-Ref
No description

besselI1(float $x)   X-Ref
No description

besselI2(float $x, int $ord)   X-Ref
No description