How to normalize a matrix such that the maximum value is 1?

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hithere 2014-12-31

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https://ww2.mathworks.cn/matlabcentral/answers/168587-how-to-normalize-a-matrix-such-that-the-maximum-value-is-1

评论： Thamires Lima 2017-10-5

采纳的回答： Azzi Abdelmalek

I have 2 matrices. I plot them against a common x-axis

.

Now I like to normalize both signal such that the largest peak of each signal is 1 so that I can compare the signals.

How should I go about doing it?

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Answer 1

Azzi Abdelmalek 2014-12-31

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If you have Image Processing Toolbox

new_y1=mat2gray(y1); 
new_y2=mat2gray(y2);
% new_y1 and new_y2  have both the same minimum equal to 0  and maximum equal to 1

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Azzi Abdelmalek 2015-1-1

在 MATLAB Online 中打开

out=cell2mat(arrayfun(@(x) mat2gray(A(x,:)),(1:size(A,1))','un',0))

Thamires Lima 2017-10-5

And, If, do I have an errorbar (y2) associated to y1 how should I write this new errrorbar (new_y2), after normalizing y1 to new_y1?

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Answer 2

Matt J 2014-12-31

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编辑：Matt J 2014-12-31

在 MATLAB Online 中打开

signal = signal/norm(signal,inf) ;

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Answer 3

Image Analyst 2014-12-31

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What about the min? Do you want that to be mapped to 0, or whatever it ends up being? If it's whatever, then (untested):

y1Normalized = y1 / max(y1);
p1 = subplot(1, 2, 1);
plot(x1, y1Normalized );
% Find what it picked as the nice ranges for the y axis:
yAxis1 = ylim();
y2Normalized = y2 / max(y2);
p2 = subplot(1, 2, 2);
plot(x2, y2Normalized);
% Find what it picked as the nice ranges for the y axis:
yAxis2 = ylim();
% Figure out what the y axis range needs to be to accomodate both plots.
yMin = min([yAxis1, yAxis2]);
yMax = max([yAxis1, yAxis2]);
% Set a common y axis range for both of them.
ylim(p1, [yMin, yMax]);
ylim(p2, [yMin, yMax]);