[Rd] Request: kronecker to get a sep= argument

[Charles C. Berry]

On Thu, 25 Nov 2010, Michael Friendly wrote:

> kronecker, with make.dimnames=TRUE uses a hardwired sep=":" in the line
>
>            tmp <- outer(dnx[[i]], dny[[i]], FUN = "paste", sep = ":")
>
> For an application in which dimnames arise from an n-way array, where 
> different dimensions have
> different roles, and I would like to be able to use kronecker in the form
>
> kronecker(A, B, make.dimnames=TRUE, sep='/')
>
> All this requires is to change the following two lines:
>
> kronecker <- function (X, Y, FUN = "*", make.dimnames = FALSE, sep=":" ...)
> {
>  ...
>            tmp <- outer(dnx[[i]], dny[[i]], FUN = "paste", sep = sep)
> }
>
>
> Otherwise, I have to reproduce the logic inside kronecker() in my application 
> function.

Or add one line of code:

res <- kronecker(m1,m3,make.dimnames=T)
dimnames(res) <-
 	lapply( dimnames(res), sub, pattern=":", replacement="/" )

HTH,

Chuck

p.s. your suggestion could break code that others may have written like

 	kronecker( letters[1:3], diag(LETTERS[1:2]), paste, sep='*' )


>
> -Michael
>
> -- 
> Michael Friendly     Email: friendly AT yorku DOT ca
> Professor, Psychology Dept.
> York University      Voice: 416 736-5115 x66249 Fax: 416 736-5814
> 4700 Keele Street    Web:   http://www.datavis.ca
> Toronto, ONT  M3J 1P3 CANADA
>
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>

Charles C. Berry                            Dept of Family/Preventive Medicine
cberry at tajo.ucsd.edu			    UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901