R help - Apr 2009 - How do I loop through strings?

I read in a CSV file with Data <-
read.csv(file="FileName.csv",head=TRUE,sep=",")

the file containts strings in the 2nd and 3rd columns and each has about
1000 rows.  I need to either loop through the strings there looking for
strings that would trigger other logic or remove those rows and put them in
another array and loop through them in the new array.  I can't seem to get
the if statement to work on the Data strings.  it doesn't recognize the
string.  Oh the strings in the CSV file all have "" around them so
Data[1,2]
is "ABC" but...
> if(Data[1,2]=="ABC") tester<-"True" else
tester<-"False"
> tester
[1] "False"


What am I doing wrong?

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Hi dre968.
Take a look at this:
> strings <-
c('ABC','DFC','AWS','','ABC','POK','MKL')
> strings
[1] "ABC" "DFC" "AWS" ""   
"ABC" "POK" "MKL"
> strings=='ABC'
[1]  TRUE FALSE FALSE FALSE  TRUE FALSE FALSE
> sapply(strings, function(x) x=='ABC')
  ABC   DFC   AWS         ABC   POK   MKL
 TRUE FALSE FALSE FALSE  TRUE FALSE FALSE

You can easily use *apply() through your data to get what you want.

HTH,

Jorge


On Wed, Apr 22, 2009 at 3:39 PM, dre968 <alyalko@gmail.com> wrote:
>
> I read in a CSV file with Data <-
> read.csv(file="FileName.csv",head=TRUE,sep=",")
>
> the file containts strings in the 2nd and 3rd columns and each has about
> 1000 rows.  I need to either loop through the strings there looking for
> strings that would trigger other logic or remove those rows and put them in
> another array and loop through them in the new array.  I can't seem to
get
> the if statement to work on the Data strings.  it doesn't recognize the
> string.  Oh the strings in the CSV file all have "" around them
so
> Data[1,2]
> is "ABC" but...
>
> > if(Data[1,2]=="ABC") tester<-"True" else
tester<-"False"
> > tester
> [1] "False"
>
>
> What am I doing wrong?
>
> --
> View this message in context:
>
http://www.nabble.com/How-do-I-loop-through-strings--tp23175824p23175824.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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