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

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danielle sisserman
danielle sisserman 2020-12-26
编辑： James Tursa 2020-12-26
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.

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采纳的回答

danielle sisserman
danielle sisserman 2020-12-26
changed
2(1+y)/(4 + (1+y)^2);
to
2*(1+y)/(4 + (1+y)^2);
and it works.

更多回答（1 个）

James Tursa
James Tursa 2020-12-26
编辑：James Tursa 2020-12-26
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.

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