Error in entropy function

I use the entropy function given belwo for my data, but Matlab gives me an error.

e=entropy(x,'shannon')

Matlab gives me this error:

Error using entropy>ParseInputs (line 58)

Too many input arguments.

Error in entropy (line 38)

I = ParseInputs(varargin{:});

Answer 1

[Walter Roberson]

The entropy function only permits a single parameter.

You are probably thinking of the wentropy function, which does permit 'shannon' as a second parameter.

[Sadiq Akbar]

Thank you dear Walter Roberson for your response.

[Sadiq Akbar]

Dear Walter Roberson my code became now like this:

clear all
clc
load 2sn0_sorted;
fitness2sn0=one;
fitness2sn0=sort(fitness2sn0,'descend');
entropy1=wentropy(fitness2sn0,'shannon')

but it gives me a -ve value. Is it possible?