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how to multiply each row in a column by different numbers

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Passband Modulation
say, a file consists of a single column with 10000 rows
load file.txt
a = file;
k=1:10000;
s = a(k,1).*cosd(3.6*k);
k=0:10000;
plot(k,s)
xlabel('k');
it does work at all, could anyone help?
  2 个评论
Image Analyst
Image Analyst 2012-10-5
Do you know how to use the debugger to step though your code? This would be easily solved if you did that.
Passband Modulation
Passband Modulation 2012-10-5
it says:
Error in ==> Untitled3 at 5 s = a(k,1)-56.97*cosd(3.6*k)-31.98*sind(3.6*k);
how to fix it, i really have no any idea.

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采纳的回答

John
John 2012-10-5
Try this if a is a column vector:
load file.txt
a = file;
k = [1:size(a,1)]';
s = a.*(cosd(3.6*k));
plot(k,s)
xlabel('k');
Alternatively, k can be any column vector you wish to perform element-by-element multiplication with a. Just make sure a and k are of the same size.

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