Maxima plot - How to add point in maxima plot - Сообщения
#1 Опубликовано: 22.01.2026 10:52:55
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
Thanks for answers,
Tomas
And can i somehow make the plot smooth without using smaller steps in vectors?
Kompresibilita_3D.sm
Thanks for answers,
Tomas
Отредактировано 22.01.2026 10:54:05
#2 Опубликовано: 22.01.2026 14:08:14
You could try to create a mesh of triangles or quadrilateral objects. Then you are free to use a problem-adjusted surface parametrization.
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
#3 Опубликовано: 27.01.2026 21:55:32
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
Thanks,
Tomáš
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
Thanks,
Tomáš
#4 Опубликовано: 28.01.2026 00:09:04
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.
Rows in a matrix are increasing top-down, whereas values in y are increasing bottom-up.
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
#5 Опубликовано: 28.01.2026 08:23:58
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
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
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
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 Опубликовано: 28.01.2026 17:30:00
See topic starter https://smath.com/en-US/forum/topic/cnc5Xp/Maxima-Plugin. I added some references there.
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
#7 Опубликовано: 28.01.2026 19:33:40
That is awesome!
Thanks,
Tomáš
Thanks,
Tomáš
#8 Опубликовано: 06.02.2026 11:03:04
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
Thanks for answers,
Tomas
how can I add point B to plot? When I tried I make point or plot, but not both of them.
kriticky_bod.sm
Thanks for answers,
Tomas
#9 Опубликовано: 06.02.2026 13:25:26
Seems to be related to the negative temperature range in the elevation_grid command.
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
#10 Опубликовано: 10.02.2026 07:29:28
Thanks for answer,
I tried to fix it and I ended with this. Still can t plot graph and point together.
kriticky_bod.sm
What should I do now?
Tomáš
I tried to fix it and I ended with this. Still can t plot graph and point together.
kriticky_bod.sm
What should I do now?
Tomáš
#11 Опубликовано: 10.02.2026 15:54:04
You still have a negative h value (temperature difference). Reverse this (and also reverse the matrix). Then it should work.
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
#12 Опубликовано: 19.02.2026 08:34:45
Thank you very much! It works.
Tomáš
Tomáš
#13 Опубликовано: 19.02.2026 10:12:49
Good to see. You also might display the z values in MJ/kg to get nicer tick labels and play around with the view parameters in the settings menu to avoid interference between axis label and tick labels.
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
#14 Опубликовано: 19.02.2026 11:38:12
Now I would like to add saturation curve. Is it better to go with matrix or function? And how can I do that?
I tried parametric function, but plot did not work.
krit_bod_2.sm
Thanks for answers!
Tomáš
I tried parametric function, but plot did not work.
krit_bod_2.sm
Thanks for answers!
Tomáš
Отредактировано 19.02.2026 12:05:07
#15 Опубликовано: 19.02.2026 13:01:39
I guess it is best to use the points object just like for the single point. Set points_joined to true, point_type to something convenient. Using a function will work only if that function is supported by the interface to Maxima, which probably doesn't apply to coolprop functions or interpolated functions.
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
#16 Опубликовано: 22.02.2026 18:05:46
Hi,
I’m back. I tried to create line of points by maxima handbook. Handbook is really great, but I couldn’t figure it out. What am I doing wrong? Matrix seems right.
And i have another question. When I created plot of enthalpy I just wrote name of the "plot function". But in the manual, there is Draw3D("plot function"). Why is that?
saturation_curve.sm
Thanks for your help and patient, I really appriciate it.
Tomáš
I’m back. I tried to create line of points by maxima handbook. Handbook is really great, but I couldn’t figure it out. What am I doing wrong? Matrix seems right.
And i have another question. When I created plot of enthalpy I just wrote name of the "plot function". But in the manual, there is Draw3D("plot function"). Why is that?
saturation_curve.sm
Thanks for your help and patient, I really appriciate it.
Tomáš
#17 Опубликовано: 23.02.2026 10:20:19
Your data matrix isn't in the correct format. It is a one-column matrix of row vectors. Make it a real n x 3 matrix, then try again.
Also, you use different units when filling the data matrix (J/kg) and for the axis limits (kJ/kg).
As to the Draw3D command, see intro text to Chapter 3.
Also, you use different units when filling the data matrix (J/kg) and for the axis limits (kJ/kg).
As to the Draw3D command, see intro text to Chapter 3.
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
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