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

normalize

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?

Best Answer

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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MATLAB: How to add custom Yaxis option for UIAxes via Editfield(Numeric) while plotting in matlab appdesigner (Ver 2020a)

ymin = app.YAxisMinValueEditField.Value;
ymax = app.YAxisMaxValueEditField.Value; % I'm guessing this handle 
ylim(app.UIAxes, [ymin, ymax])

MATLAB: How to put stacked plots in the same graph

Alan,

To plot the data all in the same plot, do something like the following.

x1 = 0:.01:1;
y1 = x1.^2;
x2 = .5:.1:1;
y2 = -1*x2 + 10;
fHand1 = figure;
aHand1 = axes('parent', fHand1);
hold(aHand1, 'on')
plot(x1, y1, 'parent', aHand1);
plot(x2, y2, 'parent', aHand1);

To make the plots scale independent - so the min of the plot is at the bottom and the max is at the top - you need to normalize the y values before plotting. In this case, it helps to remove the y axis labels to avoid confusion. Here is how I did it.

y1 = (y1 - min(y1)) / (max(y1) - min(y1));
y2 = (y2 - min(y2)) / (max(y2) - min(y2));
fHand2 = figure;
aHand2 = axes('parent', fHand2);
hold(aHand2, 'on')
plot(x1, y1, 'parent', aHand2);
plot(x2, y2, 'parent', aHand2);
set(aHand2, 'YTickLabel', [])

Let me know if this solves your problem.

~Jonathan

Best Answer

Related Solutions

MATLAB: How to add custom Yaxis option for UIAxes via Editfield(Numeric) while plotting in matlab appdesigner (Ver 2020a)

MATLAB: How to put stacked plots in the same graph

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