Why calling the functions works fine in the first run, but causes error after that?

I have a function as below:

function p1 = p1(d,i,N)
    a = 1./(d-i);
    b = ((1+i)./(1+d)).^N;
    
    p1 = a.*(1-b);
end

I called this function in a code like this:

d = 0.05;
i = 0.04;
N = 10;

p1 = p1(d,i,N);

The code runs fine in the first run, but causes error every other time.

The error is as:

Index in position 1 is invalid. Array indices must be positive integers or logical

values.

Error in test2 (line 5)

p1 = p1(d,i,N);

Answer 1

[Steven Lord]

Don't assign the output from the function p1 to a variable named p1. If you do you will not be able to call the function while the variable exists; attempts to do so will be treated as an attempt to index into the variable. Choose a different name for the output.