problem in command window : "Subscript indices must either be real positive integers or logicals"

how do i resolve this??

function [ x] = zignrinv(c )
v=9.91256303526217e-3;
r=3.442619855899;
 x(0)=(v/(nrmlpdf( r )));
x(1)=r;
x(c)=0;
for i=2:c
    x(i)=sqrt(-2*log((v/x(i-1))+nrmlpdf(x(i))))
end
for i=0:c
    zigr(i) =(x(i+1)/x(i));
end 
    
end
and the function "nrmlpdf" is as folows;
function [ y ] = nrmlpdf( x )
y=exp(-x^2/2);

end

Answer 1

[Steven Lord]

There's no such thing as element 0 of an array in MATLAB. The first element of an array is element 1. Therefore line 4 of your function cannot work.

Modify your code so it uses 1-based indexing not 0-based indexing.

[ad lyn]

thank you

[ad lyn]

how do i fix ?

[Steven Lord]

The last element of x to which your first for loop assigns is x(c). Your second for loop tries to access x(c+1) which doesn't exist. As written the last element you could create in the vector zigr is element zigr(c-1).

If x was a 5 element vector:

x = 1:5;

what would you expect zigr(5) to be and why? zigr(4) would be 5/4.