How to loop over the columns?

2016 10 28
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更新时间：2016 10 29
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I have a matrix 101x19, I want to flip each column upside down to turn peaks in valley:
How I can do a loop?
for i=1:length(data);
Flipdata(i,:) = 1.001*max(data,i-1)-(data,i);
end

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Walter Roberson
Walter Roberson 2016-10-28

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for i=1:size(data,2)
Flipdata(:,i) = 1.001 * max(data(:,i)) - data(:,i);
end
or, with no loop,
Flipdata = repmat(1.001 * max(data), size(data,1), 1) - data;
and if you have R2016b or later
Flipdata = 1.001 * max(data) - data;

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