getting error Subscript indices must either be real positive integers or logicals.

Dear all

i write a code when i run this i got error "Subscript indices must either be real positive integers or logicals." code is as follows

function z=aa(p,a,q)

t=0;

z=((p(t)-1200+150)*(-d)*(0.45+0.75*log10(abs(a(t)))+0.1*2)*(100-2)*exp(-.004*p(t))*exp(.4*q(t))...
+(0.45+0.75*log10(abs(a(t)))+0.1*2)*(100-2)*exp(-.004*p(t))*exp(.4*q(t)))^(2);

any one please tell me the solution

Thank you

Answer 1

[Nathaniel]

I'm assuming that you are intending p to operate as a function, but maybe you are not passing in a function handle?

Matlab appears to be interpreting it as a matrix, and so p(t) evaluates to p(0), i.e., the 0th element of p, rather than "p of 0" which is what I suspect you want. Since Matlab indices are 1-based, p(0) throws the "...real positive integers or logicals" error.

[MD NASAR]

Actually i want the value of p(0),P(1) etc

[Nathaniel]

What are p a and q?