Matlab Data: Remove negative values in a column?

Question

I have a set of data columns extracted using textscan from code shown below:

fid = fopen('wam1.txt','r');
C = textscan(fid,'%f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f','headerlines',4,'commentstyle','--');
fclose(fid);
x = C{1}; y1 = C{5}; y2 = C{3};

For major part of the column y1 & y2, I have negative value of -1, where no reading was taken. My task is to substitute these -1 values in the columns with 0.

I tried using changem but I can't seem to get it working.

Can someone help please.

ClojureMostly · Accepted Answer · 2013-03-02 16:19:49Z

3

You can get a boolean vector of all elements that are -1 by y1==-1 and substitute them for 0:

y2( y2 == -1 ) = 0

answered Mar 2, 2013 at 16:19

ClojureMostly

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