# [R] Very strange function() behaviour.

iliketurtles isaacm200 at gmail.com
Sat Dec 31 07:23:58 CET 2011

```Hi, R newb here. I've coded a function that inputs N dimensional array(s) [or
class=numeric if it's dim=1] of coefficients and tstats, where
dim(coef_matrix)=dim(tstat_matrix), it will then output a same dimension
matrix of coefficients pasted to tstats in brackets pasted to significance
stars.

If I go straight to the code INSIDE the function, it works 100% as it's
supposed to. The output matrix has the correct dimensions. However, if I
actually use the function, it'll do something like this.

fun.starpaste(3D matrix tstats,3D matrix coefficients) ::: CORRECT OUTPUT, 3
dimensional array.
fun.starpaste(1D numeric tstats, 1D numeric coefficients) ::: WRONG output,
output is a 3 dimensional array. And it'll keep returning a 3 dimensional
array (it'll be the correct 1 dimensional vector repeated numerous times to
fill 3 dimensions).

Then I'll copy and paste the function code again and again into the R
console, and it'll reset the slate:

fun.starpaste(1D numeric, 1D numeric) ::: CORRECT output, 1 dimensional
vector.
fun.starpaste(2D or 3D matrix, 2D or 3D matrix) ::: WRONG output, gives me a
massive 1 dimensional vector.

What the heck?? The function code is below.

#----------------------------------------------------------------------------------------------

fun.starpaste <-
function(t,co=NULL,tails=2,sig=c(0.9,0.95,0.99))   #handles the pasting of
#coef(tstat)significance_stars

{

if(length(dim(t))>1)t3<-t else fake1<-1
t<-matrix(t)

if(is.null(co)==TRUE)fake<-1 else co<-matrix(co)

if(exists(as.character(substitute(fake1)))==FALSE)fake<-1 else t3<-t

tstat<-as.numeric(t);tstat[is.na(tstat)]<-0

sig.l<-length(sig)
stars<-rawToChar(charToRaw("*********************************************"),multiple=T)

MISC1<-0
for(x in 1:length(sig)){
if(tails==1)cutoff<-qt(sig[x],Inf) else
if(tails==2)cutoff<-qt(sig[x]+0.5*(1-sig[x]),Inf) else fake<-1
MISC1<-cbind(MISC1,cutoff)
}
cutoff<-MISC1[-1]

for(i in 1:length(tstat)){
if(abs(as.numeric(tstat[i]))<=cutoff[1])tstat[i]<-c("") else fake<-1
}
for(i in 1:length(tstat)){
for(x in 1:(sig.l-1)){
if(sum(apply(matrix(1:(sig.l+1),nrow=1),c(1,2),function(N){
if(tstat[i]==cbind(c(""),c("*"),c("**"),c("***"),c("****"),c("*****"),c("******"))[N])1
else 0  } ))==0 && abs(as.numeric(tstat[i]))>cutoff[x] &&
abs(as.numeric(tstat[i]))<cutoff[x+1])
tstat[i]<-paste(stars[1:x],collapse="",sep="") else
fake<-1
if(sum(apply(matrix(1:(sig.l+1),nrow=1),c(1,2),function(N){
if(tstat[i]==cbind(c(""),c("*"),c("**"),c("***"),c("****"),c("*****"),c("******"))[N])1
else 0  } ))==0 && abs(as.numeric(tstat[i]))>=cutoff[sig.l])
tstat[i]<-paste(stars[1:sig.l],collapse="",sep="") else fake<-1
}}
options(warn=-1)
a<-as.numeric(tstat);b<-a[!is.na(a)]
if(sum(b)>0){a<-cbind(1:length(tstat),a);a<-a[!is.na(a[,2]),1];tstat[a]<-c("ERROR")}
else fake<-1

data2<-array(tstat,dim=dim(t))
dimnames(data2)<-dimnames(t)

t2<-format(round(t,tround),nsmall=tround,trim=T)
if(is.null(co)==FALSE){
co<-format(round(co,coefround),nsmall=coefround,trim=T)
t<-paste(co,c("("),t2,c(")"),data2,sep="")
t<-array(t,dim=c(length(t),1))
dimnames(t)<-dimnames(data2)
} else {t<-data2}
if(length(dim(t3))>1 &&
length(dim(t3)[dim(t3)==1])==0)t<-array(t,dim=dim(t3)) else fake<-1
return(t)

}

-----
----

Isaac
Research Assistant
Quantitative Finance Faculty, UTS
--
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