non uniform data using imagesc is wrong

Hi

I have a matrix of values (see attached), with spaced frequencies.

than i use the command

imagesc(1:step_number, frequencies, 10*log10(Spectra));

and it seems to work nice.

But when I need to plot it as wavelengths it doesn't work, and by that the data presented is wrong. (even arounf the center wavelength)

imagesc(1:step_number, 3e8./frequencies, 10*log10(Spectra));

How can I still plot this?

Answer 1

[KSSV]

How about

h = pcolor(0:step_number, 3e8./frequencies, 10*log10(Spectra)); ;
>> h.EdgeColor = 'none';

[elis02]

seems to work.

Thanks!