How can specify interval of variables in fsurf?

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Rahul Bhadani
Rahul Bhadani 2021-4-7
回答： Mathieu NOE 2021-4-7
I am following the documentation for fsurf:
https://www.mathworks.com/help/matlab/ref/fsurf.html
There, I see an example:
f1 = @(x,y) erf(x)+cos(y);
fsurf(f1,[-5 0 -5 5])
However, I do not know what is the granularity of x and y. Let's say I am interested in x for -5 < x < 0 but interval should be 0.1, i.e. in MATLAB language it should be x= -5:0.1:0. Similarly, let say Y has -5:0.2:5
How should I accomplish that?
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Rahul Bhadani
Rahul Bhadani 2021-4-7
编辑：Rahul Bhadani 2021-4-7
Thank you. This is what I was looking for. You can post it as an answer so that I can accept it.
However, there may still be a room for improvement, since meshdensity may not separatelyc control granularity in two directions.
Mathieu NOE
Mathieu NOE 2021-4-7
hello
will do ,
maybe in the future TMW will let you choose a different mesh density for each direction...

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采纳的回答

Mathieu NOE
Mathieu NOE 2021-4-7
hi
see 'MeshDensity' — Number of evaluation points per direction
Control Resolution of Surface Plot
Control the resolution of a surface plot using the 'MeshDensity' option. Increasing 'MeshDensity' can make smoother, more accurate plots while decreasing it can increase plotting speed.
Create two plots in a tiled chart layout. In the first plot, display the parametric surface x=sin(s), y=cos(s), z=(t/10)sin(1/s). The surface has a large gap. Fix this issue by increasing the 'MeshDensity' to 40 in the second plot. fsurf fills the gap, showing that by increasing 'MeshDensity' you increased the resolution.
tiledlayout(2,1)
nexttile
fsurf(@(s,t) sin(s), @(s,t) cos(s), @(s,t) t/10.*sin(1./s))
view(-172,25)
title('Default MeshDensity = 35')
nexttile
fsurf(@(s,t) sin(s), @(s,t) cos(s), @(s,t) t/10.*sin(1./s),'MeshDensity',40)
view(-172,25)
title('Increased MeshDensity = 40')

更多回答（1 个）

KSSV
KSSV 2021-4-7
Ran in:
f1 = @(x,y) erf(x)+cos(y);
x = -5:0.1:0 ;
y = -5:0.2:5 ;
[X,Y] = meshgrid(x,y) ;
Z = f1(X,Y) ;
surf(X,Y,Z)
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KSSV
KSSV 2021-4-7
I know that...but how it is going to matter surf or fsurf?
Rahul Bhadani
Rahul Bhadani 2021-4-7
Because my question was specifically about using fsurf and not in general about how to make a 3D plot.

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