[R] scoping problem?
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Thu Jan 21 20:24:56 CET 1999
yudi at hermes.ucd.ie writes:
> Dear R-helpers: (this is part of a bigger program)
> the following fails as a function, but runs OK
> if we comment out the fnfn_ function() line.
> Any hint would be appreciated. -Yudi-
>
> R : Copyright 1998, The R Development Core Team
> Version 0.63.0 Beta (Nov 13, 1998) -- on WIndows3.11
>
> fnfn _ function (m=10,n=10,spar=2)
> {
> fn _ function(u,v){
> uc_ u-floor(m/2)-1
> vc_ v-floor(n/2)-1
> exp(-(uc^2 + vc^2)/2/spar^2)
> }
> x1_ 1:m ; x2_ 1:n
> x12 _ outer(x1,x2,FUN='fn')
> filt _ x12/sum(x12)
> image(filt)
> }
>
> > source('fnfn.r')
> > m_10; n_10; spar_2
> > fnfn(m,n,spar)
You want to get rid of the quotes around fn in the outer() call. If
you pass a text string rather than the actual function, outer() will
go looking for a function of that name in its own lexical scope and fail.
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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