[Maxima] Use of erf(x); read text file; command to display available functions
biomates at telefonica.net
Fri Aug 17 04:27:27 CDT 2007
Harald Geyer escribió:
>> It would be good to make plotting work with any data type in
> I don't think there is a canonical meaning of plotting a matrix.
> I'm not sure what you are proposing.
These are some interpretations:
a) two-column and two-row matrices: consider paired numbers as point
coordinates and plot them.
b) one-column and one-row matrices: consider numbers as y values and
assign abscissas automatically from 1 to n, then plot the pairs.
c) three-column and three-row matrices: as in a), but in 3d.
d) arbitrary dimension matrix: consider m[i,j] as the pixel value of an
image and render it. These values can be interpreted as gray levels or
as entries in a color palette.
Present state in Maxima:
a) and c): dataplot in package descriptive should do the job. (I have
not checked this function for a long time.)
a), b): as Richard suggested, with some pre-processing, both plot2d and
draw2d could be used.
c): with some pre-processing, you can make use of draw3d.
d): this is already implemented by the image object of the draw package.
Next Maxima release:
All four interpretations will be implemented in the draw package. I'll
commit to cvs the new version in the next days.
Mario Rodriguez Riotorto
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