[R] A logical comparison between two character strings in R

2003-08-21 Thread Lun Li 
Dear All,

Does anyone know how to compare two character strings in R?  For eample, how 
to compare A-1-B with cc-1 in logical ?

Cheers,


Lun Li

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Re: [R] A logical comparison between two character strings in R

2003-08-21 Thread Peter Dalgaard BSA 
Lun Li [EMAIL PROTECTED] writes:

 Dear All,
 
 Does anyone know how to compare two character strings in R?  For eample, how 
 to compare A-1-B with cc-1 in logical ?

Ehhh... Is it this that you want?

  A-1-B == cc-1
[1] FALSE
  A-1-B = cc-1
[1] TRUE
  A-1-B  cc-1
[1] FALSE
  d-1-B  cc-1
[1] TRUE


-- 
   O__   Peter Dalgaard Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics 2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark  Ph: (+45) 35327918
~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907

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[R] A logical comparison between two character strings in R

2003-08-21 Thread Lun Li 
Dear All,

Can anyone know how to compare two character strings in R?  For eample, how to 
compare A-1-B with cc-1 in logical ?

Cheers,


Lun Li

__
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https://www.stat.math.ethz.ch/mailman/listinfo/r-help

Re: [R] A logical comparison between two character strings in R

2003-08-21 Thread Peter Dalgaard BSA 
Lun Li [EMAIL PROTECTED] writes:

 Thanks.
 
 But, my question is:
 
  pro.name[1]
V1
 1 B-29BT3
  temp.name[1]
 V1
 1 A-1H
  if(tem.name[1]==pro.name[1]){cat(ok)}
 
 Error in Ops.factor(left, right) : Level sets of factors are different
 
 How to compare them?

Then they are factors, not character variables. Use as.character on both
sides. 

-- 
   O__   Peter Dalgaard Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics 2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark  Ph: (+45) 35327918
~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907

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Re: [R] A logical comparison between two character strings in R

2003-08-21 Thread Lun Li 
Thanks.

But, my question is:

 pro.name[1]
   V1
1 B-29BT3
 temp.name[1]
V1
1 A-1H
 if(tem.name[1]==pro.name[1]){cat(ok)}

Error in Ops.factor(left, right) : Level sets of factors are different

How to compare them?


Lun



Quoting Peter Dalgaard BSA [EMAIL PROTECTED]:

 Lun Li [EMAIL PROTECTED] writes:
 
  Dear All,
  
  Does anyone know how to compare two character strings in R?  For
 eample, how 
  to compare A-1-B with cc-1 in logical ?
 
 Ehhh... Is it this that you want?
 
   A-1-B == cc-1
 [1] FALSE
   A-1-B = cc-1
 [1] TRUE
   A-1-B  cc-1
 [1] FALSE
   d-1-B  cc-1
 [1] TRUE
 
 
 -- 
O__   Peter Dalgaard Blegdamsvej 3  
   c/ /'_ --- Dept. of Biostatistics 2200 Cph. N   
  (*) \(*) -- University of Copenhagen   Denmark  Ph: (+45) 35327918
 ~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907


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Re: [R] A logical comparison between two character strings in R

2003-08-21 Thread Petr Pikal 


On 21 Aug 2003 at 15:49, Lun Li wrote:

 Thanks.
 
 But, my question is:
 
  pro.name[1]
V1
 1 B-29BT3
  temp.name[1]
 V1
 1 A-1H
  if(tem.name[1]==pro.name[1]){cat(ok)}
 
 Error in Ops.factor(left, right) : Level sets of factors are different

I suppose your variables are actually factors not characer vectors.

see

 temp.name
[1] B-29BT3   ccc-29BT3
Levels: B-29BT3 ccc-29BT3
 pro.name
[1] B-29BT3 B-29BT3
Levels: B-29BT3
 if(temp.name[1]==pro.name[1]){cat(ok)}
Error in Ops.factor(temp.name[1], pro.name[1]) : 
Level sets of factors are different


but

 pro.name.ch
[1] B-29BT3 B-29BT3
 temp.name.ch
[1] B-29BT3   ccc-29BT3
 if(temp.name.ch[1]==pro.name.ch[1]){cat(ok)}
ok
 

 
 How to compare them?

make them character, see ?as.character
 
 
 Lun
 
 
 
 Quoting Peter Dalgaard BSA [EMAIL PROTECTED]:
 
  Lun Li [EMAIL PROTECTED] writes:
  
   Dear All,
   
   Does anyone know how to compare two character strings in R?  For
  eample, how 
   to compare A-1-B with cc-1 in logical ?
  
  Ehhh... Is it this that you want?
  
A-1-B == cc-1
  [1] FALSE
A-1-B = cc-1
  [1] TRUE
A-1-B  cc-1
  [1] FALSE
d-1-B  cc-1
  [1] TRUE
  
  
  -- 
 O__   Peter Dalgaard Blegdamsvej 3  
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N   
   (*) \(*) -- University of Copenhagen   Denmark  Ph: (+45)
   35327918
  ~~ - ([EMAIL PROTECTED]) FAX: (+45)
  35327907
 
 
 __
 [EMAIL PROTECTED] mailing list
 https://www.stat.math.ethz.ch/mailman/listinfo/r-help

Petr Pikal
[EMAIL PROTECTED]

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Re: [R] A logical comparison between two character strings in R

2003-08-21 Thread Spencer Graves 
Did you check any documentation on R, e.g., help(Comparison) or 
www.r-project.org - Manuals - An Introdunction to R?  In Section 
2.4 on Logical vectors, I find, The logical operators are , =, , 
=, == for exact equality ... .  Consider the following:

 A-1-B == cc-1
[1] FALSE
hope this helps.  spencer graves



Lun Li wrote:
Dear All,

Does anyone know how to compare two character strings in R?  For eample, how 
to compare A-1-B with cc-1 in logical ?

Cheers,

Lun Li

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