R help - Feb 2010 - Storing processed results in a loop

Dear R Helpers
 
I have an 'instrument.csv' file with 3 instrument names and 5 rates each
i.e. it has 7 columns and 6 rows (including row names).
 
'instrument.csv'
 
instrument1      instrument2           instrument3
12                         5                        14
11                         7                          7
14                       11                          3
  8                       21                        10
11                         3                          5
 
 
Following is my R code.
 
ONS = read.csv('Instrument.csv')
n = length(ONS)
 
Y = NULL
B = NULL
 
for (i in 1 : n)
 
 {
 
 Y[i] = ONS[i]
 
  for (j in 1 : length(Y[[i]])) 
   {
   B[j] = (Y[[i]][j])^2
   } 
 
 }
 
Problem is when I type B, I get the processed result only for the last column
i.e. Y[7]. It doesn't store results for Y[1] to Y[7].
 
I need B[1], B[2].......upto B[7]. 
 
Please guide me how do I store individual column processed results?
 
Thanking you all in advance
 
Regards
 
Madhavi
 
 


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On 15.02.2010 12:47, Madhavi Bhave wrote:
> Dear R Helpers
>
> I have an 'instrument.csv' file with 3 instrument names and 5 rates
each i.e. it has 7 columns and 6 rows (including row names).
>
> 'instrument.csv'
>
> instrument1      instrument2           instrument3
> 12                         5                        14
> 11                         7                          7
> 14                       11                          3
>    8                       21                        10
> 11                         3                          5
>
>
> Following is my R code.
>
> ONS = read.csv('Instrument.csv')
> n = length(ONS)
>
> Y = NULL
> B = NULL
>
> for (i in 1 : n)
>
>   {
>
>   Y[i] = ONS[i]
>
>    for (j in 1 : length(Y[[i]]))
>     {
>     B[j] = (Y[[i]][j])^2
>     }
>
>   }
>
> Problem is when I type B, I get the processed result only for the last
column i.e. Y[7]. It doesn't store results for Y[1] to Y[7].
>
> I need B[1], B[2].......upto B[7].
>
> Please guide me how do I store individual column processed results?
>
I guess all you want is

  B <- ONS^2

and for indexing, please read basic documentation of R!
If this is homework: You do not learn by asking questions on R-help, but 
by solving the tasks yourself!

Uwe Ligges



> Thanking you all in advance
>
> Regards
>
> Madhavi
>
>
>
>
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>
>
>
>
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