truncating a long for loop

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Talaria on 30 Nov 2012
i wrote a program and it includes a for loop, on running this program matlab says the "for loop is too long, truncating to..."
what does this mean and how does it affect my program?

Answers (1)

Jos (10584)
Jos (10584) on 30 Nov 2012
Edited: Jos (10584) on 30 Nov 2012
Similar to this?
N = Inf ;
for k=1:N,
if k > 10, break ; end
which will get you a warning: Warning: FOR loop index is too large. Truncating to 9223372036854775807.
So, check your N!
Jan on 30 Nov 2012
Here truncating mean, that the FOR loop cannot "carry" such a large index vector. This is a problem of the internal representation of numbers.
Imagine the processing of a loop iteration takes 1e-3 seconds (a fair assumption). How long will it take to perform 2^41 iterations?

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