How can specify interval of variables in fsurf?

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?

[Mathieu NOE]

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')

[Rahul Bhadani]

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]

hello

will do ,

maybe in the future TMW will let you choose a different mesh density for each direction...

Answer 1

[Mathieu NOE]

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')

Answer 2

[KSSV]

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)

[Rahul Bhadani]

I am not looking at surf function but I talked about fsurf that your answer doesn't use.

[KSSV]

I know that...but how it is going to matter surf or fsurf?

[Rahul Bhadani]

Because my question was specifically about using fsurf and not in general about how to make a 3D plot.