MATLAB: How to change the ksdensity transparency

graphksdensityplot

I want to calculate ~10 kernel density estimates and overlay them on top of each other with varying transparency such that all X_f are on the same plot.

figure;
ksdensity(X_f(:,1)); hold on 
alpha(1)
ksdensity(X_f(:,2)); hold on
alpha(0.8)
ksdensity(X_f(:,3)); hold on
alpha(0.6)
ksdensity(X_f(:,4)); hold on
alpha(0.4)

Is it possible to change the transparency of kernel density estimates in a similar way/or else how can this be done?

Best Answer

ksdensity produces a line object. Line objects have no transparency (alpha) property in Matlab. So no, you can't do what you ask in native Matlab.

That being said, you could always look in the file exchange:

http://www.mathworks.com/matlabcentral/fileexchange/36953-patchline/content/patchline.m

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MATLAB: How to plot a probability distribution object

Use the pdf function:

pd = makedist('Normal','mu',75,'sigma',10);
x = 25:125;
y = pdf(pd, x);
figure
plot(x,y)
grid

MATLAB: Scale ksdensity

The output of ksdensity() is scaled so that the area under the curve is equal to 1, which is conventional for a probability density function. Using your notation, this means that

sum(xi.*diff([0,f]))

will be approximately 1.

If you want your red lines to be about the same height as the curve, you will need to multiply one or the other before plotting. For example, use the following line to use shorter red lines. (I also commented out your manual rescaling.)

plot(f,xi);line(repmat(X,2,1),repmat([0;0.01],1,length(X)),'color','r' );%axis([a b 0 40]);

If you really want to use two different scales, then you can use the plotyy() command.

Best Answer

Related Solutions

MATLAB: How to plot a probability distribution object

MATLAB: Scale ksdensity

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