How to extract specific data from a matrix?

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Scott Dallas
Scott Dallas 2015-6-19
编辑： Stephen23 2015-6-19
Hi there,
I have a 100001x7 matrix that contains data, the first column is time and the other columns contain the values of some time-dependent functions at each time point. I would like to disregard the first 50000 rows and only look at the last part of the matrix in order to create a graph analyzing the period of one of the functions in Matlab. Could someone give me advice on how to do this? I know how to use ftt to analyse the period over all time points but not sure how to restrict it to just the last part.
Thanks, Scott.

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Stephen23
Stephen23 2015-6-19
编辑：Stephen23 2015-6-19
You can use indexing to access any subset of an array:
>> X = rand(100001,7); % whole matrix
>> Y = X(50001:end,:); % from row 50001 to the last row
This is covered in MATLAB's introductory tutorials:
http://www.mathworks.com/help/matlab/getting-started-with-matlab.html

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