function call returns "index (1.2): subscripts must be either integers 1 to (2^63)-1"

I have the following function:

u_1 = @(y)   2(1+y)/(4 + (1+y)^2);

I call it:

u_1(0.2)

I get the following error:

index (1.2): subscripts must be either integers 1 to (2^63)-1 or logicals

error: called from

@<anonymous> at line 1 column 20

Any help would be greatly appriciated. Thank you.

Answer 1

[danielle sisserman]

changed

2(1+y)/(4 + (1+y)^2);

to

2*(1+y)/(4 + (1+y)^2);

and it works.

Answer 2

[James Tursa]

You are missing a multiply operator. There is no implied multiplication in MATLAB with the 2( combination. E.g.,

u_1 = @(y)   2*(1+y)./(4 + (1+y).^2);

I have also changed your operations slightly to make the function vectorized.