[SciPy-user] Array Bounds

Robert Kern robert.kern@gmail....
Fri Mar 9 12:07:27 CST 2007


Lorenzo Isella wrote:
> Dear All,
> Again a newbie question: I noticed that Python (or at least
> Numpy/Scipy) follows the C convention of labeling as zero the first
> element in an array.
> I can live with this, but I do not find very intuitive the loop behavior:
> 
> for i in range (1,5 )
> 
> means that i actually takes values 1,2,3,4 and not 5!
> Why this choice? Is it a consequence of the array labeling?

It is a consequence of *Python* using zero-indexing everywhere. numpy simply
follows suit. It means that range(len(sequence)) gives you all of the indices
into sequence.

Just give it some time. You will grow used to it.

> In case
> one should not like it, can it be changed by the user?

No.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
  -- Umberto Eco


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