3.5.10 The configuration file: widget_size cas_setup xcas_mode xyztrange
When you save changes to your configuration, this is stored in a
configuration file, which will be .xcasrc in your home
directory in Unix and xcas.rc in Windows. This file will
have four functions – widget_size, cas_setup,
xcas_mode and xyztrange – which determine the
configuration and which are evaluated when Xcas starts.
The widget_size function has between 1 and 12 arguments.
The arguments (in order) are:
The first argument is a postive integer specifying the font
size. Optionally, this can be a bracketed list whose first number
indicates the font and the second the font size.
- The second and third arguments are horizontal and vertical
distances in pixels from the upper left hand corner of the screen.
They specify where the upper left corner of the Xcas
window is when it opens.
- The fourth and fifth arguments specify the width and height of the
Xcas window when it opens.
- The sixth argument is either 0 or 1; a 1 indicates that the
on-screen keyboard should be open when Xcas starts, a 0
indicates that the keyboard should be hidden.
- The seventh argument is either 0 or 1; a 1 indicates that the
browser should be automatically opened to display help for the
selected command in the menu or index, a 0 indicates that the
browser should not be automatically opened.
- The eighth argument is either 0 or 1; a 1 indicates that
Xcas should open with the message window, a 0 indicates that
Xcas should open without the message window.
- The ninth argument is currently not used.
- The tenth argument is a string with the name of the browser to
use to read the help pages. A value of "builtin" means
that Xcas should use a small browser built into
- The eleventh argument indicates what level Xcas
should start at; a 0 means command line, a 1 means program editor, a
2 means spreadsheet, and a 3 means a 2-d geometry screen.
- The twelfth argument is a string with the name of a program
for postscript previews; for example, "gv".
The cas_setup function has nine arguments.
The arguments (in order) are:
approx. A 1 means Xcas works in
approximate mode, a 0 means numeric mode.
- complex_var. A 1 means work with complex
variables, a 0 means real variables.
- complex. A 1 means work with in complex
mode, a 0 means real mode.
- radian. A 1 means work in radians, a
0 means work in degrees.
- display_format. A 0 means use the standard
format to display numbers, a 1 means use scientific format,
a 2 means use engineering format, and a 3 means use floating
hexademical format (which is standardized with a non-zero first
- epsilon. This is the value of epsilon used
- Digits. This is the number of digits to use to
display a float.
- tasks. This will be used in the future for
- increasing_power. This is 0 to display polynomials
in increasing power, 1 to display polynomials in decreasing powers.
The xcas_mode function has one argument; a 0 to work in
Xcas mode, a 1 to work in Maple mode, a 2 to work in
MuPAD mode, and a 3 to work in TI89 mode.
The xyztrange function inserts or removes the axes of a
geometric screen; it has 15 parameters, which are the parameters which
can be set with the graphics configuration screen (see section
xyztrange (-5.5, -5.2, -10.10, -1.6, -5.5, -1.2384,2,1,0,1)
(or enter the information in the configuration screen) will result in
a visible graphics window of [-5,5] by [-1.2384,2]. Note that the
visible window is not the same as the calculation window; if the
calculation window is larger than the visible window, then you can
scroll to bring other parts of the calculation window into view.