MATLAB: Unbalanced or Unexpected parenthesis or bracket

Question

Hi, I have the following code, in which there is a matrix b, I want to plot the even index values against odd index values once I have done a conversion to 8-bit signed equivalent:

MATLAB gives me an unbalanced or unexpected parentheses or bracket error and I fail to understand why, as I don't see any error in my code, please help, below is my code:

i=1;
for i=1:1000
if i%2~=0
   if b[i]>127 %b is a two dimensional matrix of dimensions 1000 * 1
      b[i]=b[i]-256;
      x[i]=b[i];
   else
      x[i]=b[i];
   end
else 
   if b[i]>127
   b[i]=b[i]-256;
   y[i]=b[i];
   else
      y[i]=b[i];
   end
end
i=i+1;
end 
i=1
for i=1:10000
plot (x[i],y[i]);
end

I get the error at line 5, i.e.

b[i]=b[i]-256;

Answer 1

MATLAB uses round parentheses to indicate array elements, not square brackets. You probably ported that from another language and forgot to convert the brackets.