numeric index of a matrix column name ?

probably you need

match(colname0, colnames(M))


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://www.med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm



----- Original Message ----- 
From: <vincent at 7d4.com>
To: <r-help at stat.math.ethz.ch>
Sent: Friday, October 28, 2005 4:50 PM
Subject: [R] numeric index of a matrix column name ?

Dear All,

I have written the following small code in order to return
the numeric index of a given matrix column ascii name.
It works, but there is perhaps/probably a predefined function
which does that ?
If yes, thanks for pointing me to it.

# input  : a matrix M and a column ascii name
# output : the numeric index of the column
colnameindex = function(M , colname0)
{
colsnames = names(M[1,]);
theindex  = which(colsnames==colname0);
return(theindex);
}

Thanks
Vincent

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Dimitris Rizopoulos a ??crit :

probably you need
match(colname0, colnames(M))
I hope it helps.
Best,
Dimitris

yes. (why do simple ...)
Thanks Dimitris.
Have a good we.
Vincent