complex numbers

Hello,

Iam trying to write a code in shannon fano coding, the M is for representing the probability.This code line is giving me error.So hw do i rectify the error, many thanks. M=zeros(len,len) M=M-1 if (M(j,i)==0|M(j,i)==1)

??? Subscript indices must either be real positive integers or logicals.

Error in ==> p_main at 14 if (M(j,i)==0|M(j,i)==1)

Answer 1

[Arnaud Miege]

You probably want:

if (M(j,i)==0 || M(i,j)==1)

However, I would not recommend testing directly for equality if you're using double data types. Here's why:

http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

Instead compare the abs of the difference to some small tolerance value.

HTH,

Arnaud

[Arnaud Miege]

As Daniel pointed out, it's also likely that your indices i and j are out of bounds. It would help if you posted the code.

Answer 2

[Daniel Shub]

??? Subscript indices must either be real positive integers or logicals.

means that i or j (your subscripts of M) is not a real positive integer. Many MATLAB users avoid using i and j as counters since they initialize as sqrt(-1). It is also possible that when you set i or j, you set it to 0.