truncating a long for loop

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Talaria
Talaria 2012-11-30
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?

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回答（1 个）

Jos (10584)
Jos (10584) 2012-11-30
编辑：Jos (10584) 2012-11-30
Similar to this?
N = Inf ;
for k=1:N,
if k > 10, break ; end
end
which will get you a warning: Warning: FOR loop index is too large. Truncating to 9223372036854775807.
So, check your N!
  2 个评论
Talaria
Talaria 2012-11-30
编辑：Talaria 2012-11-30
i know my N is big, actually my N=2^41 my question is whether the loop will complete to N or it will terminate early, is that what truncating means? if not then what does it mean? And does that depend on my computer??
Jan
Jan 2012-11-30
编辑：Jan 2012-11-30
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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