Re: Loops (was Re: do { quit; } else { })

On 4/16/25 11:18, Michael S wrote:

On Wed, 16 Apr 2025 10:47:56 -0400
James Kuyper <jameskuyper@alumni.caltech.edu> wrote:
 

bart <bc@freeuk.com> writes:

On 16/04/2025 06:35, Janis Papanagnou wrote: 

>

>
So here, 0% of such loops have a step other than 1. THAT's what I
mean by 'unusual'. 

>
The files easily accessible to me contain 13965 for statements, of
which 596 used a step other than 1.
>

 
In quoted statement "1" was meant to cover both +1 and -1.

Most of that code was part of packages I installed rather than code that
I myself wrote. I naively assumed that any for loop where someone used
+=, it would be for a stride other than 1 - why use "+=1" rather than
"++"? However, 37 of those cases did in fact use "+= 1". None of them
used "-= 1". Indeed, I didn't find any cases of for statements using -=.

I would be surprised to find out that non-units strides are relatively
common (say, above 0.1%)

559/13965 is about 4%.

 outside of several specialized fields, like

linear algebra and image processing.

No, for most of them it was some other reason, such as putting tab stops
after ever 4 characters.