Maxima plot - SMath

#1 Posted: 1/22/2026 10:52:55 AM

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Hi, i would like to add some points to 3D plot. How can I do that?
And can i somehow make the plot smooth without using smaller steps in vectors?

Kompresibilita_3D.sm (56.04 KiB) downloaded 167 time(s).

Thanks for answers,
Tomas

Edited 1/22/2026 10:54:05 AM

#2 Posted: 1/22/2026 2:08:14 PM

Martin Kraska

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You could try to create a mesh of triangles or quadrilateral objects. Then you are free to use a problem-adjusted surface parametrization.

Martin KraskaPre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx

#3 Posted: 1/27/2026 9:55:32 PM

Tomas Novotny

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Hi,
thanks for your answer. I have another question. I´m trying to make graph of water density, but the axes are not right, what is wrong?

hustota vody.sm (69 KiB) downloaded 82 time(s).

Thanks,
Tomáš

#4 Posted: 1/28/2026 12:09:04 AM

Martin Kraska

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This is probably due to the "visual" indexing in the matrix.

Rows in a matrix are increasing top-down, whereas values in y are increasing bottom-up.

Martin KraskaPre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx

#5 Posted: 1/28/2026 8:23:58 AM

Tomas Novotny

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Thanks you very much! That helped.
But if i want to make axes right i have to switch x and y axes in elevation grid command. I don’t know why.

hustota vody.sm (135.01 KiB) downloaded 83 time(s).

Is there any sheet of something like that, where I can fing all comands for plots? And how can I write them, because commands that I used, I copied from some file I found.

Thanks for answers,
Tomáš

#6 Posted: 1/28/2026 5:30:00 PM

Martin Kraska

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See topic starter https://smath.com/en-US/forum/topic/cnc5Xp/Maxima-Plugin. I added some references there.

Martin KraskaPre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx

#7 Posted: 1/28/2026 7:33:40 PM

Tomas Novotny

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That is awesome!

Thanks,
Tomáš

#8 Posted: 2/6/2026 11:03:04 AM

Tomas Novotny

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Hi,
how can I add point B to plot? When I tried I make point or plot, but not both of them.

kriticky_bod.sm (202.22 KiB) downloaded 14 time(s).

Thanks for answers,
Tomas

#9 Posted: 2/6/2026 1:25:26 PM

Martin Kraska

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Seems to be related to the negative temperature range in the elevation_grid command.

Martin KraskaPre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx

#10 Posted: 2/10/2026 7:29:28 AM

Tomas Novotny

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Thanks for answer,
I tried to fix it and I ended with this. Still can t plot graph and point together.

kriticky_bod.sm (201.86 KiB) downloaded 2 time(s).

What should I do now?

Tomáš

#11 Posted: 2/10/2026 3:54:04 PM

Martin Kraska

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You still have a negative h value (temperature difference). Reverse this (and also reverse the matrix). Then it should work.

Martin KraskaPre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx

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