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

Wed Dec 30 15:30:46 CET 2015

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Bert Gunter

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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
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>> guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
>
>
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> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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