how to flip and combine two spectra for comparison

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aneps 2017-8-7

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评论： aneps 2017-8-16

I want to compare two spectra. What I do is multiply the Y axis of one of the spectra with -1 and then plot both the spectra on the same figure. It is good to compare but look bad while I present. Because the intensity axis of one spectra appear negative values. Is there any other way to code so that I can get spectra look like the one in the attached image?

This example I downloaded from internet. Here Y axis of both the spectra shows the real intensity.

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Walter Roberson 2017-8-7

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在 MATLAB Online 中打开

You could normalize each spectrum perhaps.

plot(time, spectrum1 ./ max(spectrum1), time, -spectrum2 ./ max(spectrum2))

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Walter Roberson 2017-8-12

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Oh, this is all about the labeling of the second plot?

In that case, use plotyy(), or the more modern yyaxis(), and set the bottom one to have 'YDir', 'reverse'. For example,

ax1 = subplot(2,1,1); plot(x,y1)
ax2 = subplot(2,1,2); plot(x,y2)
linkaxes([ax1,ax2],'x')
set(ax2,'YDir','reverse')
pos1 = get(ax1,'Position');
set(ax2,'Position', [pos1(1) pos1(2)-pos1(4), pos1(3), pos1(4)])
set(ax1,'XTick',[])