replacing values in a vector with new value?

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Leslie Paul
Leslie Paul 2016-8-27
评论： Azzi Abdelmalek 2016-8-27
Basically, I have a large vector and want to add 180 to all the negative values and subtract 180 to all positive values in the vector. Finally, I should have the same size vector with the changes. Appreciate a helping hand

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回答（2 个）

James Tursa
James Tursa 2016-8-27
编辑：James Tursa 2016-8-27
v = your vector
n = v < 0; % the negative indexes (logical)
p = v > 0; % the positive indexes (logical)
v(n) = v(n) + 180;
v(p) = v(p) - 180;
Note: This doesn't change any exact 0 values, per your description.
Image Analyst
Image Analyst 2016-8-27
Try this:
v = v - sign(v) * 180
where v is your vector. It will do what you asked for.

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