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Acordding to the documentation of maxima, with_stdout is a function that evaluates some expressions and writes the output according to this expressions to a file f. I tried to use this function with a simple example:

with_stdout ("data.txt", for x:0 thru 10 do print (x, x^2, x^3))$

But the output look like this:

<mth><n>0</n><st> </st><n>0</n><st> </st><n>0</n><st> </st></mth><mth><n>1</n><st> </st><n>1</n><st> </st><n>1</n><st> </st></mth><mth><n>2</n><st> </st><n>4</n><st> </st><n>8</n><st> </st></mth><mth><n>3</n><st> </st><n>9</n><st> </st><n>27</n><st> </st></mth><mth><n>4</n><st> </st><n>16</n><st> </st><n>64</n><st> </st></mth><mth><n>5</n><st> </st><n>25</n><st> </st><n>125</n><st> </st></mth><mth><n>6</n><st> </st><n>36</n><st> </st><n>216</n><st> </st></mth><mth><n>7</n><st> </st><n>49</n><st> </st><n>343</n><st> </st></mth><mth><n>8</n><st> </st><n>64</n><st> </st><n>512</n><st> </st></mth><mth><n>9</n><st> </st><n>81</n><st> </st><n>729</n><st> </st></mth><mth><n>10</n><st> </st><n>100</n><st> </st><n>1000</n><st> </st></mth>

instead of writting a table with three columns as it is supposed to do.

I don't even understand the first output. What I am missunderstanding or missing here?

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It seems there is a bug triggered by Wxmaxima, I don't know if it is on maxima aswell.

Regards.

Odestheory12
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NotAkuno
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  • On plain maxima you get the expected results, this does indeed look like a bug in wxmaxima – Thor Apr 17 '19 at 09:34

1 Answers1

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Apparently wxMaxima overrides the default print function to generate XML tags (stuff like <foo> ... </foo>) which wxMaxima uses to indicate how stuff is displayed. I don't know if it's possible to directly call the default print function in wxMaxima; maybe, maybe not.

I can see a few options. (1) Call grind instead, which outputs the so-called 1-dimensional output. That's probably more suitable for file output anyway.

(2) Call printf, e.g. printf(true, "~a, ~a, ~a~%", x, x^2, x^3). printf recognizes many output options, as described by ? printf. It's possible printf calls are also intercepted by wxMaxima, I haven't tried it.

(3) Use the plain text, console Maxima interface, then print is sure to be the default.

Robert Dodier
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