How to plot a probability density function on a histogram?

Hi,

I have a trouble plotting a normal density function with specific parameters on my histogram. I do not want to fit a normale distribution but I want to specify the parameters of the normal distribution myself.

Is this possible? And how?

Thanks in advance!

Answer 1

[Image Analyst]

Use bar() or plot() to plot the actual histogram. Then use "hold on" and use plot() to plot the theoretical distribution.

bar(values, counts);
hold on;
plot(myNormalDistribution, 'r-', 'LineWidth', 3);
grid on;

Answer 2

[Shashank Prasanna]

Do you have the statistics toolbox?

If you do it is straight forward as this:

Plot your regular histogram and then:

hold on
x = -3:0.1:3; 
Y = normpdf(x,0,1);
plot(x,Y)

In the above code, change your random variable x to roughly span +/- 3 sigma of your specified sigma around your mean. If you don't have the statistics toolbox you may have to code the normal pdf yourself or find something on MATLAB central.