Create a matrix with a text file- how to specify data I want in the matrix?

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Marian 2013-10-4

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评论： Marian 2013-10-7

I would like to specify which data I want read in from a large textfile. The first bit of data is a string, such as "2011-02-03 05:28:10" (quotations included). How would I read in and create a matrix using only bits of data that begin with 2011-02 (ie data from Feb 2011)? The data is in chronological order in the text file, so if there is some beginning and ending parameterization I could use, that would work as well.

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Answer 1

Walter Roberson 2013-10-5

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fgetl() a line. strcmp() the target date to the beginning of the line. If it is there, use the line; otherwise skip the line if you have not had any successful lines yet. If you have had successful lines and the new line does not match, stop reading because no further records can be in range.