Re: [R] adding a column to a matrix
Hello,
Please, consider the functions "pmin" and "pmax".
Tuesday, May 1, 2007, 3:29:54 PM, you wrote:
rc> thanks for the previous advice it seems to have worked what about the
following
rc> l have the following dataset and would like to calculate the actual
survival time by
rc> if censoring time > survival time then actual survival time
rc> =survival time else its= censoring time.
rc> treatmentgrp strata censoringTime survivalTime censoring
actualsurvivaltim
rc> [1,] 1 1 1.012159
1137.80922 0
rc> [2,] 2 2 32.971439 247.21786
0
rc> [3,] 2 1 85.758253 797.04949
0
rc> [4,] 1 1 16.999171
78.92309 0
rc> l used matrix to genarate the data
rc> thanks in advance
rc> Vladimir Eremeev <[EMAIL PROTECTED]> wrote:
rc> m<-cbind(m,0)
m[m[,3]>>m[,4],5]<-1
rc> colnames(m)[5]<-"censoring"
rc> raymond chiruka wrote:
>>
>> i would like to add a variable to an existing matrix by manipulating 2
>> previous variables eg for the data
>> m
>> treat strata censti survTime
>> [1,] 1 2 284.684074 690.4961005
>> [2,] 1 1 172.764515 32.3990335
>> [3,] 1 1 2393.195400 24.6145279
>> [4,] 2 1 30.3647718.0272267
>> [5,] 1 1 523.182282 554.7659501
>>
>> l would want to add a new column censoring by comparing ( if censti >
>> survtime then censoring=1) how do l go about it
>> thanks
>>
>> the code l used to generate the data is
>>n=100
>> > m=matrix(nrow=n,ncol=4)
>> > colnames(m)=c("treat", "strata", "censti", "survTime")
>> > for(i in 1:100)
>> m[i,]=c(sample(c(1,2),1,replace=TRUE),sample(c(1,2),1,replace=TRUE),rexp(1,.002),rexp(1,.005))
>> > m
>>
>> l know its ugly but it seems to work
>> any suggestions l still new at this
>> thanks
--
Best regards,
Vladimirmailto:[EMAIL PROTECTED]
--SevinMail--
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Re: [R] adding a column to a matrix
m<-cbind(m,0)
m[m[,3]>m[,4],5]<-1
colnames(m)[5]<-"censoring"
raymond chiruka wrote:
>
> i would like to add a variable to an existing matrix by manipulating 2
> previous variables eg for the data
> m
> treat strata censti survTime
> [1,] 1 2 284.684074 690.4961005
> [2,] 1 1 172.764515 32.3990335
> [3,] 1 1 2393.195400 24.6145279
> [4,] 2 1 30.3647718.0272267
> [5,] 1 1 523.182282 554.7659501
>
> l would want to add a new column censoring by comparing ( if censti >
> survtime then censoring=1) how do l go about it
> thanks
>
> the code l used to generate the data is
>n=100
> > m=matrix(nrow=n,ncol=4)
> > colnames(m)=c("treat", "strata", "censti", "survTime")
> > for(i in 1:100)
> m[i,]=c(sample(c(1,2),1,replace=TRUE),sample(c(1,2),1,replace=TRUE),rexp(1,.002),rexp(1,.005))
> > m
>
> l know its ugly but it seems to work
> any suggestions l still new at this
> thanks
>
>
--
View this message in context:
http://www.nabble.com/adding-a-column-to-a-matrix-tf3650601.html#a10197380
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] adding a column to a matrix
just try:
cbind(m, m[, "censti"] > m[, "survtime"])
I hope it helps.
Best,
Dimitris
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
http://www.student.kuleuven.be/~m0390867/dimitris.htm
- Original Message -
From: "raymond chiruka" <[EMAIL PROTECTED]>
To:
Sent: Thursday, April 26, 2007 11:31 AM
Subject: [R] adding a column to a matrix
>i would like to add a variable to an existing matrix by manipulating
>2 previous variables eg for the data
> m
> treat strata censti survTime
>[1,] 1 2 284.684074 690.4961005
>[2,] 1 1 172.764515 32.3990335
>[3,] 1 1 2393.195400 24.6145279
>[4,] 2 1 30.3647718.0272267
>[5,] 1 1 523.182282 554.7659501
>
> l would want to add a new column censoring by comparing ( if censti
> > survtime then censoring=1) how do l go about it
> thanks
>
> the code l used to generate the data is
> n=100
> > m=matrix(nrow=n,ncol=4)
> > colnames(m)=c("treat", "strata", "censti", "survTime")
> > for(i in 1:100)
> m[i,]=c(sample(c(1,2),1,replace=TRUE),sample(c(1,2),1,replace=TRUE),rexp(1,.002),rexp(1,.005))
> > m
>
> l know its ugly but it seems to work
> any suggestions l still new at this
> thanks
>
>
>
>
> -
>
>
> [[alternative HTML version deleted]]
>
> __
> R-help@stat.math.ethz.ch mailing list
> 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.
>
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
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R-help@stat.math.ethz.ch mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[R] adding a column to a matrix
i would like to add a variable to an existing matrix by manipulating 2 previous
variables eg for the data
m
treat strata censti survTime
[1,] 1 2 284.684074 690.4961005
[2,] 1 1 172.764515 32.3990335
[3,] 1 1 2393.195400 24.6145279
[4,] 2 1 30.3647718.0272267
[5,] 1 1 523.182282 554.7659501
l would want to add a new column censoring by comparing ( if censti >
survtime then censoring=1) how do l go about it
thanks
the code l used to generate the data is
n=100
> m=matrix(nrow=n,ncol=4)
> colnames(m)=c("treat", "strata", "censti", "survTime")
> for(i in 1:100)
m[i,]=c(sample(c(1,2),1,replace=TRUE),sample(c(1,2),1,replace=TRUE),rexp(1,.002),rexp(1,.005))
> m
l know its ugly but it seems to work
any suggestions l still new at this
thanks
-
[[alternative HTML version deleted]]
__
R-help@stat.math.ethz.ch mailing list
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.
