# [R] Margins to fill matrix

David L Carlson dcarlson at tamu.edu
Thu Sep 11 21:20:26 CEST 2014

```You want r2dtable():

> ?r2dtable
> set.seed(42)
> a <- r2dtable(1, seats, mandates)
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9]
[1,]    2    3    1    0    6    2    1    2   17
[2,]    8    0    1    1   11    0    2    1   24
[3,]    8    0    5    2    7    1    1    4   28
[4,]   10    5    3    1    6    3    0    2   30
[5,]   13    4    1    4    9    0    2    1   34
[6,]    8    2    2    0   17    3    4    0   36
[7,]   13    0    2    6    9    2    3    5   40
[8,]   12    4    4    3   12    3    3    3   44
[9,]   14    3    3    2   18    0    4    2   46
[10,]   19    2    2    0   17    5    5    0   50
[11,]  107   23   24   19  112   19   25   20  349

-------------------------------------
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77840-4352

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Stefan Petersson
Sent: Thursday, September 11, 2014 7:13 AM
To: Charles Determan Jr
Cc: r-help at r-project.org
Subject: Re: [R] Margins to fill matrix

I have :

rs <- c(3, 2, 3, 4)
cs <- c(4, 5, 3)

And want:

> matrix
[,1] [,2] [,3]
[1,] 1    2    0
[2,] 1    0    1
[3,] 1    1    1
[4,] 1    2    1

The rowSums in the above matrix is equal to sum(rs) and colSums is
equal to sum(cs). It's sort of a matrix expansion where the margins
are known beforehand...

I hope I make sense.

2014-09-11 14:09 GMT+02:00 Charles Determan Jr <deter088 at umn.edu>:
> Do you have an example of what you would like your output to look like?  It
> is a little difficult to fully understand what you are looking for.  You
> only have 18 values but are looking to fill at 10x8 matrix (i.e. 80 values).
> If you can clarify better we may be better able to help you.
>
> Charles
>
>
> On Thu, Sep 11, 2014 at 3:47 AM, Stefan Petersson <stefan at inizio.se> wrote:
>>
>> Hi,
>>
>> I have two vector of margins. Now I want to create "fill" matrix that
>> reflects the margins.
>>
>>  seats <- c(17,24,28,30,34,36,40,44,46,50)
>>  mandates <- c(107,23,24,19,112,19,25,20)
>>
>> Both vectors adds up to 349. So I want a 10x8 matrix with row sums
>> corresponding to "seats" and column sums corresponding to "mandates".
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
>
>
>
> --
> Dr. Charles Determan, PhD
> Integrated Biosciences

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