'Array indices must be positive integers or logical values' error
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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
1 个评论
David Hill
2019-9-28
Should your for-loop be:
for i=1:l
回答（1 个）
Raunak Gupta
2019-10-1
0 个投票
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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2019-9-28
2019-10-1
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