'Array indices must be positive integers or logical values' error

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Emily Gallagher
Emily Gallagher 2019-9-28
回答： Raunak Gupta 2019-10-1
I keep getting the 'Array indices must be positive integers or logical values' error specifically n=f(i).
f = (2000:100:3000);
l = length(f);
tt = zeros(1,1);
y = 4;
for i = i:l
n = f(i);
A = randn(n,n);
b = rand(n,1);
tic()
for j = 1:y %repeat nrep times for more precise timing
[L,U] = lu(A);
y = forwardsub(L,b);
x = backsub(U,y);
end
tt(i) = toc()/y %average recorded time
end

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回答（1 个）

Raunak Gupta
Raunak Gupta 2019-10-1
Hi,
The value of i is not initialized and you may start with some numerical value greater than zero at first. Otherwise n = f(i) return error because i is assigned as zero by default and in MATLAB, array indexing starts from 1. Even using logical value ‘true’ and ‘false’, the ‘false’ value will return an empty array instead of throwing an error. So you may try to initialize the looping variable.

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