how to plot gaussian filter using meshgrid Function

9 visualizzazioni (ultimi 30 giorni)
Khalid Khan il 22 Lug 2017
Commentato: Sonny Revell il 21 Feb 2021
To plot a function of two variables, you need to generate u and v matrices consisting of repeated rows and columns, respectively, over the domain of the function H and D. Use Matlab documentation to learn about the meshgrid function, and then use it to define u and v.
2 CommentiMostra NessunoNascondi Nessuno
Jan il 24 Lug 2017
Modificato: Jan il 24 Lug 2017
This looks like a homework question. If this is true, please mention this, because the another type of answers is required. 1. Submitting a solution given by someone else might be treated as cheating in your university. 2. The question contains " Use Matlab documentation to learn", and providing a solution will not support this.
Note that the reputation of this forum suffers, if the members post solutions of homeworks. Then no serious teacher will recommend to use this forum anymore. But it is another story, if you post, what you have tried so far and ask a specific question. Then the forum can assist you to solve your problem by your own.
Sonny Revell il 21 Feb 2021
I feel differently. Often times the instructors are not clear or understandable and we have to "learn on our own" from examples. The obscure lecture topic became clear from the examples from this forum. You Jan have "filled in the blanks" many times for me. Perhaps you should ask the instructors to be clear on the topics. Thanks Jan.

Accedi per commentare.

Risposta accettata

John BG il 23 Lug 2017
Hi Khalid
1.
generating U and V with meshgrid
N=4;M=4;dN=.01;dM=.01;
[U,V]=meshgrid([-N:dN:N],[-M:dM:M]);
2.
the signal
s=10;
H=exp(-1/s^2*((U-N/2).^2+(V-M/2).^2));
2.
plotting
hs=surf(U,V,H);hs.EdgeColor='none'
.
note I have extended the plot limits to [-N N] and [-M M], since the question reads [1 N] [1 M] the plot would be just a quarter 'chunk' of the cake, not including the peak
.
John BG
2 CommentiMostra NessunoNascondi Nessuno
Khalid Khan il 24 Lug 2017
thanks for helping me but there is one more problem. how and text on plot
Evaluate the function H and generate a mesh surface in Matlab and use the Matlab command text, place a string ‘H(u,v)’ above the peak location specified by the point (N/2,M/2,1.25).
How to evaluate H
Here Is My code for the text arrow
text(N/2,M/2,1.25,'\uparrow H(u,v)');
Help me out.
Jan il 24 Lug 2017
@Khalid Khan: You draw the text at z=1.25, but the Z-axis limit is at 1.0. You can use the zlim commadn to adjust this, but it looks strange that "the peak location specified by the point (N/2,M/2,1.25)" does not seem to match the current value.

Accedi per commentare.

Categorie

Scopri di più su Axis Labels in Help Center e File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by