hi does anyone know how to create a graph with a logarithmic scale on the "Y" axis? I want to make an enthalpy vs pressure diagram, has anyone already made a Mollier diagram? constant entropy lines are costing me a lot of work. Thanks for your attention

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You can do with the Zedgraph plugin

sergio

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Maxima plug-in should work too.

Integrated 2D plot should work too.
Same can be said for XY-Plot plugin.
With a little trick of course.

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Wrote

You can do with the Zedgraph plugin

sergio

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Sergio, thank you very much for answering

The logarithmic scale worked perfectly, however, the lines that it draws are somewhat wavy, as if there is noise and they are separated,
is there any way that the line is smoother and more united? Also, when I use ZG, how can I name the lines? I entered all the tempperature
and entropy data manually

thank you very much for your attention :d
My English is not very good, I hope you can understand me





file
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Wrote

Integrated 2D plot should work too.
Same can be said for XY-Plot plugin.
With a little trick of course.

logarithmic_plot.sm (13 КиБ) скачан 78 раз(а).

Thanks for answering, your method is very helpful.
Do you know how I can enter text for the graph lines? I entered all the temperature and entropy values manually,
I would like the text to be on the lines or on one side of the line without having to enter them as a text region.

thanks for your attention
I don't write in English, I hope you understand me



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You can view all at once on collected Mollier.

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Wrote

Thanks for answering, your method is very helpful.
Do you know how I can enter text for the graph lines? I entered all the temperature and entropy values manually,
I would like the text to be on the lines or on one side of the line without having to enter them as a text region.

thanks for your attention
I don't write in English, I hope you understand me

In 2D-plot and XY-plot there is a method to enter text or some marks into the graph.
Don't have any idea if this works with Zed graph.
I don't have it and I have no intention to install it.
Below you can see a simple demonstrated answer to your question.
There is also a lot of detailed information for plotting in Reference book.

Regards

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Wrote

has anyone already made a Mollier diagram? constant entropy lines are costing me a lot of work. Thanks for your attention

An horrible task for the first model from you data.
The principle is quite involved but works.
M8, M9, M10 do NOT cinterp ... confirmed Mathcad
Quadratic acceptable M9 ... M8 poor ... M10 OK
More work to conclude is needed ... as is reconciliation.
the FREAK is not done
Cheers ... Jean

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The all difficulty results from poor/unwisely collected data.