Subscript Indices MATLAB Error
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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! :)
回答（1 个）
Walter Roberson
2016-2-16
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).
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2016-2-16
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