R help - May 2008 - Max consecutive increase in sequence

Hi all R helpers,

I'm trying to comeup with nice and elegant way of "detecting"
consecutive
increases/decreases in the sequence of numbers. I'm trying with combination
of which() and diff() functions but unsuccesifuly.

For example:

sq <- c(1, 2, 3, 4, 4, 4, 5, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1);

I'd like to find way to calculate

a) maximum consecutive increase = 3 (from 1 to 4)
b) maximum consecutive decrease = 5 (from 6 to 1)

All ideas are highly welcomed!





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rle(diff(sq)) could be helpful here,
best, Ingmar

On May 13, 2008, at 11:19 PM, Marko Milicic wrote:
> Hi all R helpers,
>
> I'm trying to comeup with nice and elegant way of "detecting"
> consecutive
> increases/decreases in the sequence of numbers. I'm trying with  
> combination
> of which() and diff() functions but unsuccesifuly.
>
> For example:
>
> sq <- c(1, 2, 3, 4, 4, 4, 5, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1);
>
> I'd like to find way to calculate
>
> a) maximum consecutive increase = 3 (from 1 to 4)
> b) maximum consecutive decrease = 5 (from 6 to 1)
>
> All ideas are highly welcomed!
>
>
>
>
>
> -- 
> This e-mail and any files transmitted with it are confid... 
> {{dropped:14}}
>
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> PLEASE do read the posting guide http://www.R-project.org/posting- 
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> and provide commented, minimal, self-contained, reproducible code.

Hi Erik,

If you look at first 4 numbers, you will se that there was one increase
between first and second number (1 and 2), immediatly after that increase,
there is an increase between second and third number (2 and 3) and finaly
third consecutive increse between third and fourth number (3 and 4).

If you follow similar logic, you will identify that from 7th to 8th number
sequence decreased (from 6 to 5)...followed by 4 consecutive decreases
(until 12th and 13th number - from 2 to 1)...

Thanks for your time





On Tue, May 13, 2008 at 10:25 PM, Erik Iverson <iverson@biostat.wisc.edu>
wrote:
> Are you sure you gave us the right 'sq'?  I don't understand
what you want
> if so.
>
>
> How does 1 to 4 come from sq ?
>
>
> Marko Milicic wrote:
>
> > Hi all R helpers,
> >
> > I'm trying to comeup with nice and elegant way of
"detecting"
> > consecutive
> > increases/decreases in the sequence of numbers. I'm trying with
> > combination
> > of which() and diff() functions but unsuccesifuly.
> >
> > For example:
> >
> > sq <- c(1, 2, 3, 4, 4, 4, 5, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1);
> >
> > I'd like to find way to calculate
> >
> > a) maximum consecutive increase = 3 (from 1 to 4)
> > b) maximum consecutive decrease = 5 (from 6 to 1)
> >
> > All ideas are highly welcomed!
> >
> >
> >
> >
> >
> >

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