[R] loop for a large database

[Petr PIKAL]

Hi
> 
> SORRY!
> 
> The data in MyTable are tagsets of photos,  like this:
> 
>       V1         V2       V3      V4      V5       V6        V7   V8
> 230    green nailpolish   barrym       0       0        0         0    0
> 231       ny      green brooklyn cleanup   clean  gowanus volunteer  gcc
> 232    green       saul  lecture       0       0        0         0    0
> 233    green     colors    cores  market colores marakesh   mercado malu
> 234       ny      green brooklyn cleanup   clean  gowanus volunteer  gcc
> 235    green       saul  lecture       0       0        0         0    0
> 236 portrait        pet    white   green     cat    canon    square  eos
> 
>                          V9   V10  V11      V12 V13 V14 V15
> 230                       0     0    0        0   0   0   0
> 231 gowanuscanalconservancy     0    0        0   0   0   0
> 232                       0     0    0        0   0   0   0
> 233               malugreen maroc souk marrocos   0   0   0
> 234 gowanuscanalconservancy     0    0        0   0   0   0
> 235                       0     0    0        0   0   0   0
> 236                      is  eyes mark   taiwan  ii mk2  5d
> 
> 
> while data of MyVector is a list of tags (none of the columns in 
particular)
> whose frequency in MyTable has to be computed. Like this:
> 
> [1] "life"  "wood"  "pink"  "house" "green" "fall" 

What about changing your data frame to matrix and use table

set.seed(111)
x<-sample(letters, 200, replace=T)
y<-letters[3:6]
dim(x)<-c(20,10)
dd<-data.frame(x)
tt<-table(as.matrix(dd))
tt[names(tt) %in% y]

 
 c  d  e  f 
13  5  8  3 

Regards
Petr 

> 
> 
> 
> Thanks!!
> 
> Marianna
> 
> 
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> large-database-tp4422052p4422776.html
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