Invert Y data (Y axis)

Hi,

I have this script that will take data from 31 files, and make a colormap. I wanted to invert the y axis so that the 400 nm show up on the top (its of higher energy). How can I do that?

Thank you!

filenames={'000.mat','007.mat','013.mat','020.mat','027.mat','033.mat','040.mat','047.mat','053.mat','060.mat','067.mat','073.mat','080.mat','087.mat','093.mat','100.mat','107.mat','113.mat','120.mat','127.mat','133.mat','140.mat','147.mat','153.mat','160.mat','167.mat','173.mat','180.mat','187.mat','193.mat','200.mat'};

for i=1:numel(filenames)

load(filenames{i});

%print(filenames{i});

t_data(:,i) = lum.y0

end

angle = linspace(0,0.2,21);

wav_leng = lum.x0.';

figure;

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

xlabel('kx')

ylabel('Wavelegnth (nm)')

colorbar

Answer 1

[Voss]

Do this:

set(gca(),'YDir','reverse')

at the end (or anywhere after imagesc).

[Chalisa Mawla]

Thank you! It's exactly what I needed

[Voss]

You're welcome!

[Hasan Masud Khan]

I get error when i used this function. why ????

[DGM]

y is a numeric array, not an axes object. It has no 'dir' property. Axes objects don't have a 'dir' property either.

The first argument to set() should be an axes handle like Voss's example shows. The second argument should be a valid property name for the axes object ('ydir', not 'dir'). The set() command should be issued after the call to imagesc().

imagesc(x,y,z)
set(gca,'ydir','reverse') % or use 'normal' depending on ydata