Plot imagesc with vector of irregular spacing

Question

Ole 2023-6-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1989323-plot-imagesc-with-vector-of-irregular-spacing

评论： Sulaymon Eshkabilov 2023-6-28

a.txt

在 MATLAB Online 中打开

The code below reads the file.

But the plot is totally wrong in ww vector.

If I set set(gca,'ytick',[1:10:512],'yticklabel',ww(1:10:512))

would be ok. However I would like the labels at whole numbers of ww-> 490 500 510 520...

How can it be done ?

fid = fopen('a.txt','r');                                                 
s = importdata('a.txt');                                                  
fgetl(fid);
fgetl(fid);
dat = textscan(fid,'%f');
fclose(fid);
dat = dat{1};
n1 = s(1,1);
n2 = s(1,2); 
max1 = s(2,2);                                                            
ww = dat(1:n1); 
d = dat(n1+1:(n1+n2)); 
v = reshape(dat((n1+n2)+1:end)',[n1,n2])'; 
figure                                                               
imagesc(d,ww,v/max1); 

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Answer 1

Sulaymon Eshkabilov 2023-6-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1989323-plot-imagesc-with-vector-of-irregular-spacing#answer_1264328

在 MATLAB Online 中打开

a.txt

This is how you can get it:

s = importdata('a.txt');

D = s(3:end, 1);

n1 = s(1,1);

n2 = s(1,2);

max1 = s(2,2);

ww = D(1:n1);

d = D(n1+1:(n1+n2));

v = reshape(D((n1+n2)+1:end)',[n1,n2])';

figure

imagesc(d,ww,v/max1);

ylim([-500, -400])

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Ole 2023-6-28

编辑：Ole 2023-6-28

Thank you. It would look different if each pixel is set to the value ww

set(gca,'ytick',[1:10:512],'yticklabel',ww(1:10:512))

Sulaymon Eshkabilov 2023-6-28

It is wrong to display 1:10:512 for the values of ww(1:10:512). Two different set of values. If one can locate the indexes to the rounded ww matching for the specified range of data and then display them, but it is a bit long story. The suggested way with axis limitations is the shortest and easiest one :)

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