Error:Subscript indices must either be real positive integers or logicals.

[EDIT: Thu May 26 14:57:40 UTC 2011 - Reformat - MKF]

My code

w=[-1000:1:1000]*(4*pi/2000);
x=exp(-i*w/2).*sin(3*w);
mag=abs(x);
arg=angle(x);
realX=real(x);
imaginaryX=imag(x);

error

baitap_1_15 at 5
real_x=real(x);

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

Can you help me?

Answer 1

[Laura Proctor]

Try the command

which real

I suspect that you have a variable defined in your workspace that is named real when you are really trying to call the function real. If this is the case, clear real and then try the code.

clear real

[Matt Fig]

To give an example,

real = 9; % Masks the MATLAB function!

x = 7+6i;

real(x) % This is an index into the variable real, not a func call!