Hello Total newbie here... I hope I read the guide properly I have the following data.frame (I read it from a CSV file I cannot change) names val 1 Mandy 1 2 2 3 John 2 4 2 I want to read the row number 2, but I want the first column to be ?Mandy? and not null print (frame[2,]) 2 Mandy 2 I can manipulate the data.frame once loaded How can I fill all cell in column ?names? with the previous value ? Or is there a function that will get me the row and fill the ?names? column ? NOTA BENE: I do not want the answer, I want to find it myself but I need guidance If there is a function, tell me the library and I will search If this is an algorithm, tell me generally how you would do and let me scratch my head first ? Thanks Chris
Fill in empty cell in data.frame from previous value
9 messages · Jim Lemon, Bert Gunter, Boris Steipe +3 more
Hi Chris, You may know about the *apply family of functions. These slice various data structures and "apply" a specified function to each slice, usually returning a list of return values. As far as I am aware, you can't access adjacent rows unless you reformat the data structure. There is a way to do this particular job. It requires the sequence operator (:), the ifelse function and indexing. What you do is to create a sequence of all the values in the element "names", then subtract 1 for all the NA (or any other specified value) values and use the resulting vector to index the original element "names". It won't work if the first value is NA, nor will it work for more than one NA in a row. I realize that this is pretty obscure, but you said that you didn't just want the solution. It's a one-liner. Jim On Sun, Jun 25, 2017 at 3:49 AM, Christophe Elek
<christophe.elek at gmail.com> wrote:
Hello Total newbie here... I hope I read the guide properly
I have the following data.frame (I read it from a CSV file I cannot change)
names val
1 Mandy 1
2 2
3 John 2
4 2
I want to read the row number 2, but I want the first column to be ?Mandy? and not null
print (frame[2,])
2 Mandy 2
I can manipulate the data.frame once loaded
How can I fill all cell in column ?names? with the previous value ?
Or is there a function that will get me the row and fill the ?names? column ?
NOTA BENE: I do not want the answer, I want to find it myself but I need guidance
If there is a function, tell me the library and I will search
If this is an algorithm, tell me generally how you would do and let me scratch my head first ?
Thanks Chris
[[alternative HTML version deleted]]
______________________________________________ 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.
You need to go through some tutorials, not expect us to tutor you here. That is not the purpose of this list (although we do some of this indirectly of course). There are many good online tutorials -- search or see here: https://www.rstudio.com/online-learning/#R . Or start by going through the Intro to R tutorial that ships with R. 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 Sun, Jun 25, 2017 at 12:11 AM, Jim Lemon <drjimlemon at gmail.com> wrote:
Hi Chris, You may know about the *apply family of functions. These slice various data structures and "apply" a specified function to each slice, usually returning a list of return values. As far as I am aware, you can't access adjacent rows unless you reformat the data structure. There is a way to do this particular job. It requires the sequence operator (:), the ifelse function and indexing. What you do is to create a sequence of all the values in the element "names", then subtract 1 for all the NA (or any other specified value) values and use the resulting vector to index the original element "names". It won't work if the first value is NA, nor will it work for more than one NA in a row. I realize that this is pretty obscure, but you said that you didn't just want the solution. It's a one-liner. Jim On Sun, Jun 25, 2017 at 3:49 AM, Christophe Elek <christophe.elek at gmail.com> wrote:
Hello Total newbie here... I hope I read the guide properly
I have the following data.frame (I read it from a CSV file I cannot change)
names val
1 Mandy 1
2 2
3 John 2
4 2
I want to read the row number 2, but I want the first column to be ?Mandy? and not null
print (frame[2,])
2 Mandy 2
I can manipulate the data.frame once loaded
How can I fill all cell in column ?names? with the previous value ?
Or is there a function that will get me the row and fill the ?names? column ?
NOTA BENE: I do not want the answer, I want to find it myself but I need guidance
If there is a function, tell me the library and I will search
If this is an algorithm, tell me generally how you would do and let me scratch my head first ?
Thanks Chris
[[alternative HTML version deleted]]
______________________________________________ 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.
______________________________________________ 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.
Run it through a loop. I assume the cell contents is NA (Not Available). Test for it with is.na(). Whenever that returns TRUE, replace the NA value with the value from the previous row. Cheers, B.
On Jun 24, 2017, at 1:49 PM, Christophe Elek <christophe.elek at gmail.com> wrote: Hello Total newbie here... I hope I read the guide properly I have the following data.frame (I read it from a CSV file I cannot change) names val 1 Mandy 1 2 2 3 John 2 4 2 I want to read the row number 2, but I want the first column to be ?Mandy? and not null print (frame[2,]) 2 Mandy 2 I can manipulate the data.frame once loaded How can I fill all cell in column ?names? with the previous value ? Or is there a function that will get me the row and fill the ?names? column ? NOTA BENE: I do not want the answer, I want to find it myself but I need guidance If there is a function, tell me the library and I will search If this is an algorithm, tell me generally how you would do and let me scratch my head first ? Thanks Chris [[alternative HTML version deleted]]
______________________________________________ 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.
Perfect Jim, that Is exactly what I needed ? let me check that ... Cheers From: Jim Lemon Sent: June 25, 2017 3:11 AM To: Christophe Elek Cc: r-help at r-project.org Subject: Re: [R] Fill in empty cell in data.frame from previous value Hi Chris, You may know about the *apply family of functions. These slice various data structures and "apply" a specified function to each slice, usually returning a list of return values. As far as I am aware, you can't access adjacent rows unless you reformat the data structure. There is a way to do this particular job. It requires the sequence operator (:), the ifelse function and indexing. What you do is to create a sequence of all the values in the element "names", then subtract 1 for all the NA (or any other specified value) values and use the resulting vector to index the original element "names". It won't work if the first value is NA, nor will it work for more than one NA in a row. I realize that this is pretty obscure, but you said that you didn't just want the solution. It's a one-liner. Jim On Sun, Jun 25, 2017 at 3:49 AM, Christophe Elek
<christophe.elek at gmail.com> wrote:
Hello Total newbie here... I hope I read the guide properly
I have the following data.frame (I read it from a CSV file I cannot change)
names val
1 Mandy 1
2 2
3 John 2
4 2
I want to read the row number 2, but I want the first column to be ?Mandy? and not null
print (frame[2,])
2 Mandy 2
I can manipulate the data.frame once loaded
How can I fill all cell in column ?names? with the previous value ?
Or is there a function that will get me the row and fill the ?names? column ?
NOTA BENE: I do not want the answer, I want to find it myself but I need guidance
If there is a function, tell me the library and I will search
If this is an algorithm, tell me generally how you would do and let me scratch my head first ?
Thanks Chris
[[alternative HTML version deleted]]
______________________________________________ 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.
Excellent Boris, thx ? this helps From: Boris Steipe Sent: June 25, 2017 11:23 AM To: Christophe Elek Cc: r-help at r-project.org Subject: Re: [R] Fill in empty cell in data.frame from previous value Run it through a loop. I assume the cell contents is NA (Not Available). Test for it with is.na(). Whenever that returns TRUE, replace the NA value with the value from the previous row. Cheers, B.
On Jun 24, 2017, at 1:49 PM, Christophe Elek <christophe.elek at gmail.com> wrote: Hello Total newbie here... I hope I read the guide properly I have the following data.frame (I read it from a CSV file I cannot change) names val 1 Mandy 1 2 2 3 John 2 4 2 I want to read the row number 2, but I want the first column to be ?Mandy? and not null print (frame[2,]) 2 Mandy 2 I can manipulate the data.frame once loaded How can I fill all cell in column ?names? with the previous value ? Or is there a function that will get me the row and fill the ?names? column ? NOTA BENE: I do not want the answer, I want to find it myself but I need guidance If there is a function, tell me the library and I will search If this is an algorithm, tell me generally how you would do and let me scratch my head first ? Thanks Chris [[alternative HTML version deleted]]
______________________________________________ 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.
library(tidyr)
> ?fill G?ran
On 2017-06-24 19:49, Christophe Elek wrote:
Hello Total newbie here... I hope I read the guide properly I have the following data.frame (I read it from a CSV file I cannot change) names val 1 Mandy 1 2 2 3 John 2 4 2 I want to read the row number 2, but I want the first column to be ?Mandy? and not null print (frame[2,]) 2 Mandy 2 I can manipulate the data.frame once loaded How can I fill all cell in column ?names? with the previous value ? Or is there a function that will get me the row and fill the ?names? column ? NOTA BENE: I do not want the answer, I want to find it myself but I need guidance If there is a function, tell me the library and I will search If this is an algorithm, tell me generally how you would do and let me scratch my head first ? Thanks Chris [[alternative HTML version deleted]]
______________________________________________ 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.
That's the kind of help that we like to provide. And for extra marks, you can write a small function that will deal with consecutive NA values. Jim On Mon, Jun 26, 2017 at 1:25 AM, Christophe Elek <christophe.elek at gmail.com> wrote:
Perfect Jim, that Is exactly what I needed ? let me check that ... Cheers *From: *Jim Lemon <drjimlemon at gmail.com> *Sent: *June 25, 2017 3:11 AM *To: *Christophe Elek <christophe.elek at gmail.com> *Cc: *r-help at r-project.org *Subject: *Re: [R] Fill in empty cell in data.frame from previous value Hi Chris, You may know about the *apply family of functions. These slice various data structures and "apply" a specified function to each slice, usually returning a list of return values. As far as I am aware, you can't access adjacent rows unless you reformat the data structure. There is a way to do this particular job. It requires the sequence operator (:), the ifelse function and indexing. What you do is to create a sequence of all the values in the element "names", then subtract 1 for all the NA (or any other specified value) values and use the resulting vector to index the original element "names". It won't work if the first value is NA, nor will it work for more than one NA in a row. I realize that this is pretty obscure, but you said that you didn't just want the solution. It's a one-liner. Jim On Sun, Jun 25, 2017 at 3:49 AM, Christophe Elek <christophe.elek at gmail.com> wrote:
Hello Total newbie here... I hope I read the guide properly
I have the following data.frame (I read it from a CSV file I cannot
change)
names val
1 Mandy 1
2 2
3 John 2
4 2
I want to read the row number 2, but I want the first column to be
?Mandy? and not null
print (frame[2,])
2 Mandy 2
I can manipulate the data.frame once loaded
How can I fill all cell in column ?names? with the previous value ?
Or is there a function that will get me the row and fill the ?names?
column ?
NOTA BENE: I do not want the answer, I want to find it myself but I need
guidance
If there is a function, tell me the library and I will search
If this is an algorithm, tell me generally how you would do and let me
scratch my head first ?
Thanks Chris
[[alternative HTML version deleted]]
______________________________________________
R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
PLEASE do read the posting guide http://www.R-project.org/
posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Hi
Maybe I am missing something but in package "zoo" is function "na.locf", which fills empty cells with previous value.
So when you read your file
dat<-read.table("....", na="")
you can use
library(zoo)
sapply(dat, na.locf)
the only problem is that it changes factors to numeric representation. It is solved here
https://stackoverflow.com/questions/22771260/na-locf-converts-data-from-numeric-to-character
Cheers
Petr
-----Original Message----- From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Christophe Elek Sent: Sunday, June 25, 2017 5:26 PM To: Boris Steipe <boris.steipe at utoronto.ca> Cc: r-help at r-project.org Subject: Re: [R] Fill in empty cell in data.frame from previous value Excellent Boris, thx ? this helps From: Boris Steipe Sent: June 25, 2017 11:23 AM To: Christophe Elek Cc: r-help at r-project.org Subject: Re: [R] Fill in empty cell in data.frame from previous value Run it through a loop. I assume the cell contents is NA (Not Available). Test for it with is.na(). Whenever that returns TRUE, replace the NA value with the value from the previous row. Cheers, B.
On Jun 24, 2017, at 1:49 PM, Christophe Elek <christophe.elek at gmail.com>
wrote:
Hello Total newbie here... I hope I read the guide properly
I have the following data.frame (I read it from a CSV file I cannot
change)
names val
1 Mandy 1
2 2
3 John 2
4 2
I want to read the row number 2, but I want the first column to be
?Mandy? and not null
print (frame[2,])
2 Mandy 2
I can manipulate the data.frame once loaded How can I fill all cell in
column ?names? with the previous value ?
Or is there a function that will get me the row and fill the ?names? column ?
NOTA BENE: I do not want the answer, I want to find it myself but I
need guidance If there is a function, tell me the library and I will
search If this is an algorithm, tell me generally how you would do and
let me scratch my head first ?
Thanks Chris
[[alternative HTML version deleted]]
______________________________________________ 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.
[[alternative HTML version deleted]]
______________________________________________ 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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