The print command inside with_stdout will pretty-print the output -
fit1.dat will therefore contain xml code with wxmaxima and latex code
with imaxima. To disable pretty-printer, add display2d:false to
doline:
doline() := block([x,y,r,display2d:false],...
HTH,
Andrej
2008/8/13 tyler <tyler.smith at mail.mcgill.ca>:
> Hi,
>
> I'm new to maxima, trying to learn it by working through "Maxima
> by
> Example". I've run into some strange differences between the
> various
> frontends. I want to run the lsquares_estimates example, which
> starts
> with:
>
> doline() := block ([x, y, r],
> set_random_state(make_random_state (654321)),
> with_stdout("fit1.dat", for i : 1 thru 10 do (
> x:i,
> r: -0.2 + random(0.4),
> y: 1 + x + r,
> print(x,y))))$
>
> doline()$
> datamatrix: read_matrix("fit1.dat");
>
> I've saved this in a file named max.test. Running
>
> batch(<path-to-max.test>);
>
> in maxima running in a shell gives me the expected result, and I
> can
> follow up with the rest of the example:
>
> load(lsquares)$
> lsquares_estimates( datamatrix, [x, y], y = a*x + b, [a, b]);
>
> However, running the same batch command in wxmaxima gives the
> following
> error:
>
> +----------------------------------------------------------------------+
> (%i1) batch("/home/tyler/math.scripts/maxima/max.test")$
> batching #p/home/tyler/math.scripts/maxima/max.test
> Maxima encountered a Lisp error:
> Error in SYMBOL-NAME [or a callee]: "fit1.dat" is not of type
> SYMBOL.
> Automatically continuing.
> To reenable the Lisp debugger set *debugger-hook* to nil.
> +----------------------------------------------------------------------+
>
> Similarly, if I try and run the code from imaxima mode in Emacs, I
> get a
> lot of LaTeX errors:
>
> +----------------------------------------------------------------------+
> (%i1) batch("/home/tyler/math.scripts/maxima/max.test");
>
> batching #p/home/tyler/math.scripts/maxima/max.test
> (%i2)
> doline():=block([x,y,r],set_random_state(make_random_state(654321)),
> with_stdout("fit1.dat",
> for i thru 10 do
> (x:i,r:random(0.4)-0.2,y:r+x+1,print(x,y))))
> (%i3) doline()
> (%i4) datamatrix:read_matrix("fit1.dat")
> \%o4\pmatrix{LaTex error in:
> &\linebreak[0]1&\linebreak[0]\mathrm{linebreak}&\linebreak[0][&\linebreak[0]0&\linebreak[0]]&\linebreak[0]\mathrm{verb}&\linebreak[0]|&\linebreak[0]|&\linebreak[0]\mathrm{linebreak}&\linebreak[0][&\linebreak[0]0&\line
> <similar lines snipped> LaTex error in: \cr }
> (%i5) load(lsquares)$
>
> (%i6) lsquares_estimates( datamatrix, [x, y], y = a*x + b, [a,
> b]);
> \%o6\left[ \left[ a=\mathrm{\%r1},\linebreak[0]b=1-LaTex error in:
> \*\mathrm{\%r1} \right] \right]
> Dependent equations eliminated: (1)
> +----------------------------------------------------------------------+
> xmaxima produces the same (correct) results as when I run maxima
> in a shell. The contents of fit1.dat after running doline() in
> imaxima is: 1\linebreak[0]\verb|
> |\linebreak[0]1.8904297759986988\linebreak[0]\verb|
> | 2\linebreak[0]\verb|
> |\linebreak[0]3.0708006792184199\linebreak[0]\verb|
> | 3\linebreak[0]\verb|
> |\linebreak[0]3.9215499737129562\linebreak[0]\verb|
> | 4\linebreak[0]\verb|
> |\linebreak[0]5.1813105366407903\linebreak[0]\verb|
> | 5\linebreak[0]\verb|
> |\linebreak[0]5.9443320691994819\linebreak[0]\verb|
> | 6\linebreak[0]\verb|
> |\linebreak[0]7.0155581812674983\linebreak[0]\verb|
> | 7\linebreak[0]\verb|
> |\linebreak[0]7.8441238703147151\linebreak[0]\verb|
> | 8\linebreak[0]\verb|
> |\linebreak[0]8.8805527006616263\linebreak[0]\verb|
> | 9\linebreak[0]\verb|
> |\linebreak[0]9.8132057313401884\linebreak[0]\verb|
> | 10\linebreak[0]\verb|
> |\linebreak[0]11.129174792619052\linebreak[0]\verb| | The
> contents of fit1.dat after running doline() in wxmaxima is: Maxima
> encountered a Lisp error: Error in SYMBOL-NAME [or a callee]: " "
> is not of type SYMBOL. Automatically continuing. To reenable
> the Lisp debugger set *debugger-hook* to nil. The contents of
> fit1.dat after running doline() in maxima or xmaxima is: 1
> 1.890429775998699 2 3.07080067921842 3 3.921549973712956 4
> 5.18131053664079 5 5.944332069199482 6 7.015558181267498 7
> 7.844123870314715 8 8.880552700661626 9 9.813205731340188 10
> 11.12917479261905 What I'm I doing wrong here? I like the
> graphical presentation of results in wxmaxima and imaxima, but
> does this interact with the evaluation of commands somehow?
> Thanks, Tyler Maxima 5.15.0 Using GCL 2.6.7 imaxima version 1.0b
> wxMaxima 0.7.1 running on Debian GNU/Linux testing
>
> --
> Power corrupts. PowerPoint corrupts absolutely.
> --Edward Tufte
>
> http://www.wired.com/wired/archive/11.09/ppt2.html
>
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