## Not Sure How I'm Getting "Subscript indices must either be real positive integers or logicals"

on 17 Apr 2013

### per isakson (view profile)

Here is my code, it is an iterative solution to an equation, and I keep getting the error which occurs in the denom(i) line: Subscript indices must either be real positive integers or logicals

g1=1.4;

g4=1.4;

T1=300;

T4=300;

p4p1=5;

R=287;

a1=sqrt(g1*R*T1);

a4=sqrt(g4*R*T4);

ratio= [1.01:.0001:10];

exponent=-2*g4/(g4-1);

numer=ratio;

denom=numer;

temp=denom;

for i=1:length(ratio)

```   numer(i)=(g4-1)*(a1/a4)*(ratio(i)-1);
denom(i)=sqrt(2*g1((2*g1)+(g1+1)*((ratio(i)-1))));
temp(i)=ratio(i)*((1-(numer(i)/denom(i)))^(exponent));
if abs(temp(i)-p4p1)<.01
p2p1=ratio(i);
break;
end
end```

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### per isakson (view profile)

on 17 Apr 2013

`    denom(i)=sqrt(2*g1*((2*g1)+(g1+1)*((ratio(i)-1))));`

Cory Stack

### Cory Stack (view profile)

on 18 Apr 2013

Wow I feel dumb lol but thanks for the help!

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