How to code a function that calculates the redundancy of a given alphabet

I have a function that calculates the entropy of vector element

function h = alph_entropy(P)
  h = -sum(P .* log2(P));
endfunction

What should i do next? Thanks!

Redundancy of entropy function should use alph_entropy function

[KALYAN ACHARJYA]

Save the function in diffenent MATLAB script as function file, later call the same in main script. Vary P and get different results of h, later plot(P,h);

You may learn Basics from MATLAB Onramp

[Vadim Potorocha]

So is it should be like this?

function r = redundancy_entropy(P)
r =  alph_entoropy(P);
endfunction

Answer 1

[KSSV]

It looks like you are using Octave.

You can call functions in multiple ways.

Option 1:

function h = alph_entropy(P)
  h = -sum(P .* log2(P));
end

Save the above function in a file and name it as alph_entropy.m. MATLAB takes the name default funciton name, but Octave you have to give the name. The name of the function and file name should be same. Then go to the folder where function is present and you can call this function in a file or in command window.

P = rand(100,1) ;   % your P variable
h = alph_entropy(P) ;  % calling function with P as input

Option 2: Annoymous function

h = @(P) -sum(P .* log2(P)) ;  % this is a function handle 
P = rand(100,1) ;
iwant = h(P)