# [R] Information Frequency problem calculation

jim holtman jholtman at gmail.com
Mon Oct 7 18:38:34 CEST 2013

```does 'table' do the job for you?

> input <- read.table(text = "Name1 Name2 category
+
+ mauro francesco E234
+ luca   giuseppe  E5578
+ luca   franco  E5569
+ maria luca E4556", header = TRUE, as.is = TRUE)
> input
Name1     Name2 category
1 mauro francesco     E234
2  luca  giuseppe    E5578
3  luca    franco    E5569
4 maria      luca    E4556
> table(input\$Name1, input\$Name2)

francesco franco giuseppe luca
luca          0      1        1    0
maria         0      0        0    1
mauro         1      0        0    0
>

Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.

On Mon, Oct 7, 2013 at 12:09 PM, jarod_v6 at libero.it <jarod_v6 at libero.it> wrote:
> Dear All,
>
> I Have a dataframe like that:
>
> Name1 Name2 category
>
> mauro francesco E234
> luca   giuseppe  E5578
> luca   franco  E5569
> maria luca E4556
> ...
> I would like to calculate the frequency of many time in my data I found  in
> the list name:
>
> name1<-as.character(a[,1])
> name2<-as.character(a[,2])
> category<-as.character(a[,3])
>
> for(i in 1:lenght(name1)){
>  re <-which(name1 == name2)
>
> }
>
> So how can create a table of frequncy of many times I found a name in column
> one respect to the second ?