How can I plot spectral data from 2 different day to compare 2 variables?

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Claudio Ignacio Fernandez
评论： Pieter Hamming 2018-6-22
Hi I have a matrix with spectral data (attached the excel in zip format because is not uploading the excel) the first line is the wavelengths (variables) the first column is the day 1 and 2. the code I'm using is [d1 d2]=xlsread('path ... filename.xls'); then variable=d1(1,1:end); data=d1(2:end,:); day1=d2(1:6,1); day2=d2(7:18,:);
How can I plot or scatter, column 76 (for example) in the axe X against the column 100 in the axe Y of each day in the same plot? I'm trying to see both data groups in the same plot.

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Pieter Hamming
Pieter Hamming 2018-6-21
Does this do what you need? If not, can you clarify the question?
[d1 d2]=xlsread('data2days.xlsx');
col1=76; %first column to be compared
col2=100; %second column to be compared
figure(1);clf(1);
scatter(d1(2:7,col1),d1(2:7,col2))
hold on
scatter(d1(8:end,col1),d1(8:end,col2))
legend('D1','D2')
  2 个评论
Claudio Ignacio Fernandez
Claudio Ignacio Fernandez 2018-6-21
Thanks, it really looks like what I'm looking for. I've been using Matlab for a week and only know how to plot things like plot (x,y). This kind of code is available in any tutorial? I really appreciate. Regards.
Pieter Hamming
Pieter Hamming 2018-6-22
I wouldn't know of a specific tutorial, but if you want some general matlab skills there's tons of tutorials around.
Whenever I need something specific I tend to Google "Matlab [something]" and more often than not, there's a Matlab function which does exactly what I need. I then use the awesome documentation ("doc ...") to figure out how to use it.
Hope this helps

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