index must be a positive integer or logical.

Im trying to plot data points and i keep getting "Attempted to access w(1.79867e-06); index must be a positive integer or logical."

I have no idea how to fix it. Any help would be great.

CODE:

r = 1.798*10^-3; c = 0.001*10^-6; l = 3.234*10^-9; f = logspace(6,9,4000); w = 2*pi*f; h = 1/(1+i*(w(l/r)-(1/(w*r*c))));

semilogx(f,20*log(abs(h)))

Answer 1

[Azzi Abdelmalek]

Use ./ instead of / and also you a missed a multiplication operator *

h = 1./(1+i*(w*(l/r)-(1./(w*r*c))));

Answer 2

[John BG]

the main problem comes from

w(l/r)
Subscript indices must either be real positive integers or logicals.

You are trying to reach element 0, because from your script, l=0, r=0, and here MATLAB assumes 0/0=0 but in MATLAB vectors start with index 1, not 0, regardless of the size and amount of dimensions of the matrix.

If you find this answer of any help solving your question,

please click on the thumbs-up vote link,

thanks in advance

John

[e-mail]