Subscript Indices MATLAB Error

p=1.2;
q=1;
LRainbow=6.1;
y=linspace(0,100000);
h(y)=(p*(y.^2))/(q+(y.^2));

I keep getting this error in regards to the h(y) line:

 Subscript indices must either be real positive integers or logicals.

I don't understand what this means and how to fix it. Can anyone help? Thanks! :)

Answer 1

[Walter Roberson]

In MATLAB, only symbolic functions can be defined using the syntax

NAME(VARIABLE) = EXPRESSION

If you are not defining a symbolic function you would have to use an anonymous function:

h = @(y) (p*(y.^2))./(q+(y.^2));

(Note: I corrected your / to ./ along the way)

As this would be a function, you would need to apply it to a value to get a result, such as

plot(y, h(y))

However, in MATLAB when you already know the value of the variables to apply to, you would typically skip creating a function and would instead just use an expression that calculated the values directly:

h = (p*(y.^2))./(q+(y.^2));
plot(y, h);

You need to learn to distinguish functions (formula that say how a value should be created given inputs) from values (actual results of calculation given inputs).