subscript indices must either be real positive integers or logicals

Hello,

I have a following function

    % BER.m
    function probability = BER(Sin, Sout, MTrans)

    rate = 0;
    for k = 1: MTrans
        if Sin(k) == Sout(k)
            rate = rate+1;
        end
    end
    probability = rate/MTrans;

And I use this function in the Main.m file

BER = BER(DataGenOut, DataRx_Out , MTrans);

The rest of the code in Main.m is compiled correctly. Thank you in advance for your help.

[Jan]

And which line causes the error?

Answer 1

[Walter Roberson]

Do not use a variable that is named the same thing as your function. After the first execution of such a line, BER would no longer refer to the function and would refer to the variable you had created.

Note: you can simplify your function to the line

probability = mean(Sin(1:MTrans) == Sout(1:MTrans));

Answer 2

[Jan]

In the line:

BER = BER(DataGenOut, DataRx_Out , MTrans);

the function "BER" is overwritten by the local variable with the same name. If you call "BER" afterwards again, the following arguments are treated as indices.

Btw. your function can be simplified:

   function probability = BER(Sin, Sout, MTrans)
   probability = sum(Sin(1:MTrans) == Sout(1:MTrans)) / MTrans;