2D color map change the input of y axis

Question

Chalisa Mawla 2022-5-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1710145-2d-color-map-change-the-input-of-y-axis

评论： Chalisa Mawla 2022-5-3

采纳的回答： Constantino Carlos Reyes-Aldasoro

I have this script that will compile the data in each file into a 2D color map.

I wanted to change the value of the y axis so that I have the wave number (k) in y axis, instead of wavelength. k=2pi/wavelength

How I might be able to do this?

,filenames={'000.mat','013.mat','025.mat','038.mat','050.mat','063.mat','075.mat','088.mat','100.mat','113.mat','125.mat','138.mat','150.mat','163.mat','175.mat','188.mat','213.mat','225.mat','238.mat','250.mat','263.mat','275.mat','288.mat','300.mat','313.mat','325.mat','338.mat','350.mat','363.mat','375.mat','388.mat','400.mat','413.mat','425.mat','438.mat','450.mat','463.mat','475.mat','488.mat','500.mat'}

for i=1:numel(filenames)

load(filenames{i});

%print(filenames{i});

t_data(:,i) = lum.y0

end

angle = linspace(0,0.5,51);

wav_leng = lum.x0.';

figure;

imagesc(angle,wav_leng,t_data); colormap turbo; axis xy;

xlabel('kx')

ylabel('Wavelegnth (nm)')

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Answer 1

Constantino Carlos Reyes-Aldasoro 2022-5-3

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https://ww2.mathworks.cn/matlabcentral/answers/1710145-2d-color-map-change-the-input-of-y-axis#answer_956235

Hello

There are 2 ways to change the values of the y axis, first is to change the values when you plot. I do not have your files so I will use random numbers instead:

imagesc([0:0.01:0.2],[400:900],rand(numel(0:0.01:0.2),numel(400:900)))

axis xy

This simulates your figure, now instead of using [400:900], which is your wav_leng, change it like this:

imagesc([0:0.01:0.2],2*pi./[400:900],rand(numel(0:0.01:0.2),numel(400:900)))

axis xy

The second would be to change the tick values once you plot. Let me know if this works or if you need the second option.