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Is it possible to define my own functions in some file, and have it loaded automatically each time 'giac' or 'xcas' start?

Yes, add your commands in ~/.xcasrc Linux/Mac or in xcas.rc Windows (note that the file will be overwritten if you change and save your setup).

Thanks for replying.

I checked your solution. It works for 'giac' only (the console app), not for 'xcas' (the GUI app).

For example, I added ";myfunc(x):=x*666;" to ~/.xcasrc. 'giac' then recognizes "myfunc", but 'xcas' doesn't.

Is there a solution that works for 'xcas' as well?

For reference, here's the content of my ~/.xcasrc (note the last line):
(I'm using xcas 1.2.3, which comes with Ubuntu 18.04.)

Indeed, the xcasrc file is executed in the null context, not in the session context.
The best is perhaps to run read("script_filename") in the first level of your xcas session when you start a new file. When you load an existing worksheet, all variables are restored, you don't need to re-parse them.

I did this by using the following:

I modified runxcas.en to:

#! /bin/bash
export LANG=en
export XCAS_ROOT='/cygdrive/C/Programs_OS/xcas'
# export XCAS_HOME='/cygdrive/p'
# export XCAS_AUTOSAVEFOLDER='/cygdrive/p'
export XCAS_LOCALE="$XCAS_ROOT/locale/"
export XCAS_HELP="$XCAS_ROOT/aide_cas"
cp /cygdrive/C/Programs_OS/xcas/eq_funcs_template.xws /cygdrive/C/Programs_OS/xcas/eq_funcs.xws
if [ "$1" == "" ]
then
$XCAS_ROOT/xcas.exe /cygdrive/C/Programs_OS/xcas/eq_funcs.xws
else
$XCAS_ROOT/xcas.exe /cygdrive/C/Programs_OS/xcas/eq_funcs.xws "$1"
fi

Note, I created a template called eq_funcs_template.xws with all my functions loaded in it. That file is in C:\Programs_OS\xcas. That template gets copied into eq_funcs.xws and opened in the last if statement. If I double click a xws file it opens it and the "template file". That way I always have a fresh file to work on that has all my functions.

I also modified xcasen.bat to include C:\Programs_OS\xcas in the PATH:

set PATH=C:\Programs_OS\xcas;%PATH%
bash.exe '/cygdrive/C/Programs_OS/xcas/runxcas.en' %1

hope it works for you. Since you are running Linux, maybe xcasen.bat isn't necessary.

XcasEngGuy a écrit : ↑

lun. juin 03, 2019 10:41 pm

I did this by using the following:

I modified runxcas.en to:

Thanks. I considered this solution, but it's flawed for me: I usually launch xcas from the directory I work in, as I want xcas to save the file to the diretcory I'm in, without me navigating there. But if I load it with a template file, it will default to the template file's direcotry. Besides, I wouldn't be able to save the file just by pressing Control-S but will have to use the mouse (for "save as").

BTW, in your script you can replace the 'if' statement with:

$XCAS_ROOT/xcas.exe /cygdrive/C/Programs_OS/xcas/eq_funcs.xws "$@"

(I.e., use $@ instead of $1 or null).

add:

cd "$(dirname "$@")"
cp /cygdrive/C/Programs_OS/xcas/eq_funcs_template.xws eq_funcs.xws
$XCAS_ROOT/xcas.exe eq_funcs.xws "$@"

puts the template in the same directory as the file you open.