Relative frequency y-axis using the histfit function

Dear,

I am trying to plot two histograms with weibull probability density curves on the same figure.

However, I am having difficulty changing the y axis from absolute frequency to relative frequency.

If it was just a histogram, I could easily recalculate the y-axis values and change the yticklabel values. However I need to plot two histograms on the same figure, and the two datasets do not have the same length.

Below is a reproducible example of how I am currently doing.

data1 = wblrnd(0.4,2,[1000,1]); data1 = data1(data1 <= 1); 
data2 = wblrnd(0.4,2,[900,1]); data2 = data2(data2 <= 1); 

h1 = histfit(data1, 10, 'weibull')
hold on
h2 = histfit(data2, 10, 'weibull')

h1(2).Color = [.5843 .8157 .9882]
h2(2).Color = [.9100 .4100 .1700]

alpha(h1(1),.5)
alpha(h2(1),.5)
uistack(h1(2),'top')

Below is the picture I am currently generating. I want the y axis to be the relative frequency, not the absolute frequency or probability density.

Could someone help me with this?

Thank you very much in advance.

Answer 1

[dpb]

IIUC,

N1=sum(h1(1).YData);
N2=sum(h2(1).YData);
h1(1).YData=h1(1).YData/N1;
h1(2).YData=h1(2).YData/N1;
h2(1).YData=h2(1).YData/N2;
h2(2).YData=h2(2).YData/N2;

should do it...obviously, can clean it up a little...

[Robson Passos]

Thank you very much.