Plotting certain columns from a .dat file

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Jesse
Jesse 2011-9-20
Greetings all,
It's been quite some time since I've used MATLAB, and embarrasingly I've been struggling with this all day. Needless to say I am a bit rusty! I have a data file that has 8 columns of data (and has headers at the top). Right now I'm trying to just plot column 2 of the data on the x-axis and plot the 4th and 8th columns as two line plots along the y-axis.
I imagine you use fopen and textscan, but there's so many to choose from. Maybe importdata?
Any help would be appreciated. Thanks!

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Fangjun Jiang
Fangjun Jiang 2011-9-20
If your data file format is consistent, try
data=importdata('MyFile.data');
For plotting, if you have a matrix A, A(:,2) is all the data in the second column so you can do:
plot(A(:,2),A(:,4),'r',A(:,2),A(:,8),'b');
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Fangjun Jiang
Fangjun Jiang 2011-9-21
data is a structure, type data in Command Window to see what it contains. You need to do A=data.data.
You've used MATLAB long time ago so maybe going through the "Getting Started" in MATLAB document is beneficial.
Jesse
Jesse 2011-9-21
Fangjun,
Ah yes! I forgot about the . operator to make the matrices agree!
Thanks - that worked!

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