# Re: [R] How to best divide table by table

From: Martin Maechler <maechler_at_stat.math.ethz.ch>
Date: Mon 30 Oct 2006 - 09:08:31 GMT

But *please* do learn from Peter Dalgaard's answer that this has nothing to do with "table"s (Petr, I agree you have "helped" Serguei, but...)

Using vague language is not helpful in such contexts. And hence, calling data frames 'tab1' is probably not a good idea.
{Calling them 'data' is not much better though:

> fortune("dog")

Firstly, don't call your matrix 'matrix'. Would you call your dog 'dog'?   Anyway, it might clash with the function 'matrix'.

• Barry Rowlingson R-help (October 2004) }

Martin Maechler

>>>>> "Petr" == Petr Pikal <petr.pikal@precheza.cz> >>>>> on Mon, 30 Oct 2006 08:12:57 +0100 writes:

```    Petr> Hi Assuming the same order in both tables divide only
Petr> columns you wont and then add column of names. You
Petr> need to work with data frame, as working with matrices
Petr> cannot use mixed types columns.

Petr> tab1<-data.frame(letters[1:3], 1:3)
Petr> tab2<-data.frame(letters[1:3], 10)
Petr> data.frame(tab1[,1],tab1[,-1]/tab2[,-1])
```
Petr> tab1...1. tab1....1..tab2....1. 1 a 0.1 2 b 0.2 3 c     Petr> 0.3

Petr> How to set appropriate column names you can find in     Petr> help page ?data.frame

Petr> HTH Petr

Petr> On 27 Oct 2006 at 18:42, Serguei Kaniovski wrote:

```    Petr> Date sent: Fri, 27 Oct 2006 18:42:36 +0200 (CEST)
Petr> From: Serguei Kaniovski <kaniovsk@wsr.ac.at> To:
Petr> r-help@stat.math.ethz.ch Organization: WIFO Subject:
Petr> [R] How to best divide table by table

```

>> Hi all,
>>
>> how can I divide two tables of the same dimension so that
>> all names are preserved, ie do not become NA? I have
>> "tab1" and "tab2", each having names in the first
>> column. I want "tab3" with the same names and values
>> "tab1/tab2".
>>
>> Thanks, Serguei

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