# [R] need for help for solving operations in a vector

Bert Gunter bgunter.4567 at gmail.com
Wed Dec 30 15:30:46 CET 2015

```"Maybe you shall spend some time reading R intro manual which can
serve you as an excellent starting point to learn R. Although it has
one hundred pages it is quite readable and you may find it as a best
present you found under Christmas tree."

Fortune nomination!

Cheers,
Bert

Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Tue, Dec 29, 2015 at 11:28 PM, PIKAL Petr <petr.pikal at precheza.cz> wrote:
> Hi
>
> You probably can do also only
>
> Irig.tot <- (Irrig>HM)*6.123
>
> to get desired vector without any further typing around.
>
> Logical vector can be treated as c(0,1) vector. FALSE equals zero and TRUE equals 1 on calculations.
>
> Maybe you shall spend some time reading R intro manual which can serve you as an excellent starting point to learn R. Although it has one hundred pages it is quite readable and you may find it as a best present you found under Christmas tree.
>
> Cheers
> Petr
>
> From: Makram Belhaj Fraj [mailto:belhajfraj.makram at gmail.com]
> Sent: Tuesday, December 29, 2015 9:12 PM
> To: PIKAL Petr
> Cc: r-help at r-project.org
> Subject: RE: [R] need for help for solving operations in a vector
>
>
> Hi Petr
> I do thé calculation left as follows
>
> Irrig=qWC1
> Irrig [Irrig>HM]=-1
> Irrig[Irrig>0]=0
> Irrig.tot=-Irrig*6.123 #6.123 is the hydraulic conductivity at saturation
> And I got the vector needed
> Cheers
> Makram
> Le 28 déc. 2015 12:15, "PIKAL Petr" <petr.pikal at precheza.cz<mailto:petr.pikal at precheza.cz>> a écrit :
> Hi
>
> On top of answers you have got here is some plotting you need to answer yourself
>
> plot(qWC1, col=(c(0, diff(qWC1))>=0 )+1)
>
> Which from those red points you want to be included in irrigation period? All of them? Only part? Which part?
>
> Based on your figures you probably will not get 100% correct answer.
>
> Cheers
> Petr
>
>
>
>> -----Original Message-----
>> From: R-help [mailto:r-help-bounces at r-project.org<mailto:r-help-bounces at r-project.org>] On Behalf Of Makram
>> Belhaj Fraj
>> Sent: Wednesday, December 23, 2015 8:35 AM
>> To: r-help at r-project.org<mailto:r-help at r-project.org>; r-help-owner at r-project.org<mailto:r-help-owner at r-project.org>
>> Subject: [R] need for help for solving operations in a vector
>>
>>  Dear colleagues
>> i need your generous help to solve the following problem
>>
>> I have a  soil moisture time series qWC1 (61 values)
>> > qWC1
>>  75.33336 75.20617 75.20617 74.95275 74.95275 74.70059 74.70059
>> 74.70059
>> 74.57498 74.44968 74.32469 74.07563  85.57237 90.40123 90.73760
>> 90.73760 90.73760 90.73760 90.90648 91.07582 91.24564 90.90648 86.82135
>> 80.69793
>> 79.30393 78.62058 78.21484 77.81226 77.67876 77.41279 77.28032 76.88495
>> 76.75383 76.75383 76.49260 76.36249  76.23270 76.23270 76.10325
>> 75.97412
>> 75.84532 75.71685  75.71685 75.71685 75.71685 75.46087 75.46087
>> 75.46087
>> 75.33336 75.20617 75.20617 75.20617 75.20617 75.20617 75.20617 75.07930
>> 75.07930 75.07930 74.95275 74.95275  74.95275
>>
>> I want to measure consecutive increases corresponding to irrigation and
>> consecutive decreases  corresponding to recharge I wrote the following
>> code and it does not calculate for each increment in i?
>> also note that I choose to not use diff command in time series because
>> I  want also that "plateaux" corresponding to a minimum of 2 equal
>> consecutive values are accounted as positive differences=irrigations so
>> when x[i+1]==x[i] the difference y might be equal to the previous value
>> xi
>>
>> following the code i wrote
>>
>> x<-ts(qWC1,start=1, end=61, frequency=1) x[1] plot(x, type="h", col =
>> "green")
>> y<-rep(0,61)
>> for (i in 1:61) {
>> if (x[i+1] > x[i]){
>>     y[i]==x[i+1]-x[i]
>> } else if (x[i+1]==x[i]){
>>     y[i]=x[i+2]-x[i]
>> } else {
>>     y[i]==x[i+1]-x[i]
>> }
>>
>> }
>> plot(y, type="h", col = "blueviolet")
>>
>> Many thank
>> Makram
>>
>>       [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help at r-project.org<mailto:R-help at r-project.org> mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-
>> guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
>
>
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> ______________________________________________
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