Calculate e raise to the power in awk

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Top Forums UNIX for Beginners Questions & Answers Calculate e raise to the power in awk | UNIX Post 303041159 by wisecracker on Friday 15th of November 2019 05:11:58 PM

11-15-2019

Registered User

Assuming your formula is correct, checked longhand in Python 3.8.0 using the math library:

Code:

Last login: Fri Nov 15 17:16:16 on ttys000
AMIGA:amiga~> python3.8
Python 3.8.0rc1 (v3.8.0rc1:34214de6ab, Oct  1 2019, 12:56:49) 
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import math
>>> 
>>> math.exp((0.5-0.013)*0.5)/(1.0+math.exp((0.5-0.013)*0.5))
0.5605759881403045
>>> math.exp((0.5-0.01125)*0.5)/(1.0+math.exp((0.5-0.01125)*0.5))
0.5607915159336736
>>> math.exp((0.5-0.3581)*0.5)/(1.0+math.exp((0.5-0.3581)*0.5))
0.5177300630065548
>>> math.exp((1.0-0.005268)*25)/(1.0+math.exp((1.0-0.005268)*25))
0.9999999999841571
>>> _

So your rounded values seem OK.
Again this assumes that your formula is correct.

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LEARN ABOUT NETBSD

expf

EXP(3)							   BSD Library Functions Manual 						    EXP(3)

NAME

     exp, expf, exp2, exp2f, expm1, expm1f, -- exponential functions

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     exp(double x);

     float
     expf(float x);

     double
     exp2(double x);

     float
     exp2f(float x);

     double
     expm1(double x);

     float
     expm1f(float x);

DESCRIPTION

     The exp() and the expf() functions compute the base e exponential value of the given argument x.

     The exp2(), and exp2f() functions compute the base 2 exponential of the given argument x.

     The expm1() and the expm1f() functions computes the value exp(x)-1 accurately even for tiny argument x.

RETURN VALUES

     These functions will return the appropriate computation unless an error occurs or an argument is out of range.  The functions exp() and
     expm1() detect if the computed value will overflow, set the global variable errno to ERANGE and cause a reserved operand fault on a VAX.

SEE ALSO

     math(3)

STANDARDS

     The exp() functions conform to ANSI X3.159-1989 (``ANSI C89'').  The exp2(), exp2f(), expf(), expm1(), and expm1f() functions conform to
     ISO/IEC 9899:1999 (``ISO C99'').

HISTORY

     The exp() functions appeared in Version 6 AT&T UNIX.  The expm1() function appeared in 4.3BSD.

BSD
								September 13, 2011							       BSD