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match - returns a vector of the positions of (first) matches - looking for All positions.

8 messages · Kehl Dániel, PIKAL Petr, Witold E Wolski +1 more

Original
Witold E Wolski
# 
Looking for a build in function which returns a vector of the
positions of _ALL_ matches.
Kehl Dániel
# 
Dear Witold,

as a first hint: read posting guide please! People are answering in their free time, so please try to be polite!

For your first problem: what are you expecting? You have a dataset where most of the values is missing, the others all 0's most of the time, and some Inf values as well...

For the second problem: give a reproducible example, please.

daniel
________________________________________
Felad?: r-help-bounces at r-project.org [r-help-bounces at r-project.org] ; meghatalmazó: Witold E Wolski [wewolski at gmail.com]
K?ldve: 2014. febru?r 3. 11:18
To: r-help at r-project.org
T?rgy: [R] match - returns a vector of the positions of (first) matches - looking for All positions.

Looking for a build in function which returns a vector of the
positions of _ALL_ matches.




--
Witold Eryk Wolski

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and provide commented, minimal, self-contained, reproducible code.
PIKAL Petr
# 
Hi

which(table == match)

or

which(table %in% match)

Petr
________________________________
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- odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen? zn?m?.

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Witold E Wolski
# 
Hi Petr,

I was actually citing the match (%in%) docu -
match returns the positions of (first) matches.

I am looking for something returning ALL matches (sure it's
easy to write a function which does it ...
my intuition however is, that there is already such a function in R - is there
something which isn't already implemented in R? Not that I know of. )

regarding :

which(table == match)

in case table is a vector the output produced is going to be:

Warning message:
In table == match :
  longer object length is not a multiple of shorter object length



regards
On 3 February 2014 11:36, PIKAL Petr <petr.pikal at precheza.cz> wrote:

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      PIKAL Petr
    

    

      
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Hi

Posting questions without context may result in answers unrelated to your problem.

Anyway it works for me without problem

table<-sample(letters[1:5], 20, replace=T)
which(table %in% "a")
[1]  1  2 19

            

      
      
      
    

        
_
platform       i386-w64-mingw32
arch           i386
os             mingw32
system         i386, mingw32
status         Under development (unstable)
major          3
minor          1.0
year           2013
month          12
day            19
svn rev        64488
language       R
version.string R Under development (unstable) (2013-12-19 r64488)
nickname       Unsuffered Consequences

Regards
Petr

            

      
      
      
    

        

      
      
    

            

      
      
      
    

        

      
      
    

            

      
      
      
    

        
________________________________
Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou ur?eny pouze jeho adres?t?m.
Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie vyma?te ze sv?ho syst?mu.
Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat.
Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou modifikacemi ?i zpo?d?n?m p?enosu e-mailu.

V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?:
- vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? smlouvy, a to z jak?hokoliv d?vodu i bez uveden? d?vodu.
- a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze strany p??jemce s dodatkem ?i odchylkou.
- trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve v?slovn?m dosa?en?m shody na v?ech jej?ch n?le?itostech.
- odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen? zn?m?.

This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients.
If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system.
If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner.
The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email.

In case that this e-mail forms part of business dealings:
- the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning.
- if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation.
- the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects.
- the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient.

  
  


  


      

    

    

      
      

        


  

        

      Witold E Wolski
    

    

      
      #
    

  


  

      
Thank you. That's what I was looking for.

I am  wondering what does the documentation means by (first) than?

match {base}
match returns a vector of the positions of (first) matches of its
first argument in its second.

        
On 3 February 2014 15:02, PIKAL Petr <petr.pikal at precheza.cz> wrote:

            

      
      
      
    

        

      
      
    

            

      
      
      
    

        

      
      
    

            

      
      
      
    

        

      
      
    

        

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      PIKAL Petr
    

    

      
      #
    

  


  

      
Hi

If you are in doubt, try it. It is usually easy and does not do any harm.

test<-sample(letters[1:5], 20, replace=T)

match(test,"c")
 [1] NA NA NA  1  1 NA  1  1 NA NA NA  1  1 NA NA NA NA NA NA NA
match("c", test)
[1] 4

First occurence of "c" is at 4th position of test vector. There are others but only the first is returned.

Regards
Petr

            

      
      
      
    

        

      
      
    

            

      
      
      
    

        

      
      
    

            

      
      
      
    

        

      
      
    

            

      
      
      
    

        

      
      
    

            

      
      
      
    

        
________________________________
Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou ur?eny pouze jeho adres?t?m.
Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie vyma?te ze sv?ho syst?mu.
Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat.
Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou modifikacemi ?i zpo?d?n?m p?enosu e-mailu.

V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?:
- vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? smlouvy, a to z jak?hokoliv d?vodu i bez uveden? d?vodu.
- a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze strany p??jemce s dodatkem ?i odchylkou.
- trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve v?slovn?m dosa?en?m shody na v?ech jej?ch n?le?itostech.
- odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen? zn?m?.

This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients.
If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system.
If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner.
The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email.

In case that this e-mail forms part of business dealings:
- the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning.
- if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation.
- the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects.
- the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient.

  
  


  


      

    

    

      
      

        


  

        

      William Dunlap
    

    

      
      #
    

  


  

          

      
      
      
    

        
How is this different than
   which( table == "a")
?  The latter is probably a tad faster.

I thought the OP had 2 vectors, x and table, and wanted a list the length
of x, such that the i'th element of the list gave the positions of the elements
of the table that matched x[i].  I don't know why this would be useful, but a
naive implementation would be
    f <- function(x, table)lapply(structure(x, names=x), function(xi)which(table == xi))
 used as
   > t1 <- c("a", "b", "a", "c", "b")
   > t2 <- c("b", "b", "c", "d", "c")
   > f(t1, t2)
   $a
   integer(0)

   $b
   [1] 1 2

   $a
   integer(0)
   
   $c
   [1] 3 5
   
   $b
   [1] 1 2

Bill Dunlap
TIBCO Software
wdunlap tibco.com