joint probability 2 arrays

Hi, I need to find the joint probability between 2 arrays of the same length and plot the 2 arrays togheter with the probability (as the colour) with scatter

Answer 1

[Balaji Udayagiri]

Hi meshesurf

As per my understanding, you want to find the plot for the joint probability density functions.

Here is an example code that you can modify according to your need:

X = [1;2;1;1;2;1;1]; 
Y = [1;1;2;2;1;1;2]; 

%First find all list of values in X and Y seperately 
% In this case I have taken only 1,2 as the possible values, 
x_vals = [1,2]; 
y_vals = [1,2]; 

values={x_vals y_vals}; 
count=hist3([X,Y],'ctrs',values);%first count the values 
p=count/sum(sum(count)); % then divide by the sum on all matrix value to get probability 
%% 
imagesc(p); 

imagesc displays the probability values as differenc tcolour intensities.