How can specify interval of variables in fsurf?

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Rahul Bhadani 2021-4-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/794782-how-can-specify-interval-of-variables-in-fsurf

回答： Mathieu NOE 2021-4-7

采纳的回答： Mathieu NOE

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 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 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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Answer 1

Mathieu NOE 2021-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/794782-how-can-specify-interval-of-variables-in-fsurf#answer_669047

在 MATLAB Online 中打开

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')