How to overlay a curve over histogram?

Question

Chiara Petrillo 2017-4-26

编辑： Andrew Newell 2017-4-26

Hi There,

New to Matlab so sorry if the question is simple!

I have plotted a histogram with the following code:

data = csvread('testformatlab.csv')
col1 = data(:,8); %all rows in column 1 
col2 = data(:,14);
X = (col1)./(col2);
histogram(X);

*I would like to overlay a curve to the histogram, similar to the red one in the attached image. My current histogram is shown in the blue image.

Thankyou!!!

Answer 1

Andrew Newell 2017-4-26

编辑：Andrew Newell 2017-4-26

If you already have the curve, then just type hold on and plot it. An example:

ydata = randn(1000,1);
hist(ydata)
hold on
x = min(ydata):0.1:max(ydata);
y = 500*normpdf(x);
plot(x,y,'r')