Re: [Maxima-lang-fr] make a file

[Robert D. <rob...@ya...>]

Hello Pierre,

I apologize, but I don't speak French (despite my name).
So I'll respond in English.

> I want to create a file of datas with maxima to produce an histogramm
> with gnuplot.
> How must I order the datas? In a list? or in a matrix(n,2) ? or in
> sequence [[.,.][.,.]......]?
> How can I produce the file xxx.dat ?

If you have already computed the data and you only want
to write the data to a file --

The function write_data in the package numericalio
writes data to a file. For example,

M : matrix ([1, 2], [11, 22], [111, 222]);
write_data (M, "/tmp/tmp.out");
printfile ("/tmp/tmp.out");
 =>
1 2
11 22
111 222

To see information about write_data,

? write_data


If you have not already computed the data --

The functions barsplot and histogram in the descriptive package
make histograms, for discrete and continuous data, respectively.

load (descriptive);

loads the package.

? barsplot
? histogram

should display information about them. Note: The descriptive
package is new in Maxima 5.9.3, and older versions of Maxima
do not have it.

Both barsplot and histogram assume the input is a list of
values, which are counted to find relative frequencies.
So you don't need to count them before calling barsplot or histogram.


Hope this helps,
Robert Dodier

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