What are the mathematical functions of perl

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Perl mathematical function

Perl mathematical function

Perl Mathematical function name sin

Call syntax retval=sin (value)

The explanation parameter is the arc value.

Perl Mathematical function name cos

Call syntax retval=cos (value)

The explanation parameter is the arc value.

Perl Mathematical function name atan2

Call syntax retval=atan2 (value1,value2)

Explains the operation and returns the arctan value of value1 divided by value2, in radians, in the range of-PI~PI.

Application example:

The angle is converted into a Radian subroutine. Subdegrees_to_radians {

Local ($degrees) = @ _

Local ($radians); 11:

$radians=atan2 (1BI 1) * $degrees/45

}

Perl Mathematical function name sqrt

Call syntax retval=sqrt (value)

Explain the square root function. Value is a nonnegative number.

Perl Mathematical function name exp

Call syntax retval=exp (value)

The explanation returns to the value power of e.

Perl Mathematical function name log

Call syntax retval=log (value)

Explain the natural logarithm with e as the base.

Perl Mathematical function name abs

Call syntax retval=abs (value)

Explains the absolute value function. (not in Perl4)

Perl Mathematical function name rand

Call syntax retval=rand (num)

Explains the random number function and returns a floating-point number between 0 and the integer num.

Perl Mathematical function name srand

Call syntax srand (value)

Commentary initializes the random number generator. Make sure that each call to rand is truly random.

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