Plotting a heat map using surf function
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I have a 2D matrix and I want to plot a heat map. I use the following codes:
fig = surf(X,Y,F);
set(fig,'linestyle','none')
view(2)
But it displays just a plan entirely blue despite the large difference between Z values as shown in image below. How can I fix this issue?
6 个评论
Dyuman Joshi
2023-9-29
Please attach the data you are working with.
Hi Dyuman,
I attached the image I am working on and here is my code:
clc
clear
f = imread('img.jpg');
f = im2gray(f);
f = rescale(f);
F = fft2(f);
F = abs(F);
x = (0 : size(f,2) - 1)';
y = (0 : size(f,1) - 1)';
[X, Y] = meshgrid(x,y);
fig = surf(X,Y,log(F+1));
set(fig,'linestyle','none')
view(2)
@Roohollah, The plot obtained here is different compared to the one you have attached above.
clc
clear
f = imread('img.jpg');
f = im2gray(f);
f = rescale(f);
F = fft2(f);
F = abs(F);
x = (0 : size(f,2) - 1)';
y = (0 : size(f,1) - 1)';
[X, Y] = meshgrid(x,y);
fig = surf(X,Y,log(F+1));
set(fig,'linestyle','none')
view(2)
Roohollah
2023-10-2
Dyuman Joshi
2023-10-2
I ran the code again and plotted some data tips, and the output is still different from what you got.
Check the image attached.
Roohollah
2023-10-3
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