pmath - simple command line interface to Math::Cephes
bash> pmath Interactive interface to the Math::Cephes module. TermReadLine enabled. Type 'help' or '?' for help. pmath> setprec 4 display set to 4 decimal places pmath> cos($PI) -1.0000 pmath> acos(%) 3.1416 pmath> q bash>
This script provides a simple command line interface to the Math::Cephes module. If available, it will use the Term::ReadKey and Term::ReadLine::Perl or Term::ReadLine::GNU modules to provide command line history and word completion.
Math::Cephes
Term::ReadKey
Term::ReadLine::Perl
Term::ReadLine::GNU
Typing help or ? alone will provide a list of help topics grouped by major category name. help category will provide a listing and short description of each function within the named category. help function will provide a description and synopsis of the named function.
help
?
help category
help function
Entering an expression that returns a single value, such as sin($x), or one that returns multiple values, such as airy($x), will result in all return values being printed. The last (successful) single value returned is saved as the % symbol (as in Maple), so that one can do
sin($x)
airy($x)
%
pmath> sin($PI/2) 1 pmath> asin(%) 1.570796 pmath>
The number of decimal places displayed can be set to j using setprec j:
j
setprec j
pmath> setprec 8 display set to 8 decimal places pmath> $PI 3.14159265 pmath>
Multiple statements can be entered on a line, such as pmath> $x=1; $y=exp($x); printf("\texp(%5.2f)=%5.2f\n",$x,$y); exp( 1.00)= 2.72 pmath>
or on multiple lines using \ as a continuation signal:
\
pmath> $x = 1; \ $y = exp($x); \ printf("exp(%5.2f)=%5.2f\n", $x, $y); exp( 1.00)= 2.72 pmath>
To quit the program, enter q, quit, or exit.
q
quit
exit
The Math::Cephes module has some support for handling fractions and complex numbers through the Math::Cephes::Fraction and Math::Cephes::Complex modules. For fractions, one can use the fract() function to create a fraction object, and then use these in a fraction routine:
Math::Cephes::Fraction
Math::Cephes::Complex
fract()
pmath> $f=fract(1,3); $g=fract(4,3); $f->radd($g); 5/3 pmath> mixed(%) 1 2/3 pmath>
Similarly, for complex numbers one can use the cmplx() function to create a complex number object, and then use these in a complex number routine:
cmplx()
pmath> $f=cmplx(1,3); $g=cmplx(4,3); $f->cadd($g); 5+6 i pmath>
See Math::Cephes::Polynomial for an interface to some polynomial routines, and Math::Cephes::Matrix for some matrix routines.
Probably. Please report any to Randy Kobes <randy@theoryx5.uwinnipeg.ca>
Math::Cephes, Math::Cephes::Fraction, Math::Cephes::Complex, Math::Cephes::Polynomial and Math::Cephes::Matrix.
This script is copyrighted, 2000, 2002, by Randy Kobes. It may be distributed under the same terms as Perl itself.
To install Math::Cephes, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Math::Cephes
CPAN shell
perl -MCPAN -e shell install Math::Cephes
For more information on module installation, please visit the detailed CPAN module installation guide.