MATLAB: Array indices must be positive integers or logical values.

Question

price=25000
dp=1000
r=1.06
rm=r/12
loan=24000
n=[2:1:10];
payment=loan*((rm(1+rm)^n)/(((1+rm)^n)-1))

Answer 1

Add some multiplication and element-wise operators:

payment=loan*((rm*(1+rm).^n)./(((1+rm).^n)-1));
                 ↑      ↑   ↑         ↑   ← AS INDICATED BY THE ARROWS

and your code works.

The error had to do with:

rm(1+rm)

since MATLAB interpreted ‘(1+rm)’ as a subscript reference to ‘rm’.