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the fsurf produce incorrect plotting?

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Chuliang Fu
Chuliang Fu on 27 Sep 2019
Edited: Asvin Kumar on 1 Oct 2019
Hi,
When I use [syms]+[fsurf]
it seems not produce correct answer:
syms T P
G=T*log(P);
fsurf(G,[298 500 10^(-10) 10])
20190926210237.png
it can be easily checked that it doesn't produce correct plotting by any analytical calculation
So why is that?

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Accepted Answer

Asvin Kumar
Asvin Kumar on 30 Sep 2019
Edited: Asvin Kumar on 1 Oct 2019
The output by fsurf in the example given is being plotted for P in the range of 298 – 500 and T in the range of 10^(-10) – 10. This behaviour is observed because fsurf maps the values in the xyinterval argument to the symbolic variables in G as listed in:
symvar(G)
One simple workaround for this would be to replace [298 500 10^(-10) 10] with [10^(-10) 10 298 500].
Another approach would be to use symfun as follows:
syms T P
G= symfun(T*log(P),[T P]);
fsurf(G,[298 500 10^(-10) 10]);
For more details have a look at:

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