Based on Column 3 values how to get specific column 1 values?

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raghavendra kandukuri
评论： jonas 2018-10-24
I have 3 columns of data coming from excel, Please find attached txt file, for instance in the attached txt file when column C is '0', i would like to get the value of column A at that point and the two more values above it i.e 2301,2300,2244 in the attached file.

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jonas
jonas 2018-10-23
编辑：jonas 2018-10-24
fid = fopen('sample.txt')
out = textscan(fid,'%f%f%f','headerlines',1);
fclose(fid)
A = cell2mat(out);
id0 = find(A(:,3) == 0);
idc = [id0,id0-1,id0-2];
idc = unique(idc)
idc(idc<1) = [];
A(idc, 1)
ans =
2244 2300 2301
works for multiple zeros as well
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