On 02/23/2013 11:34 AM, Prew, Paul wrote:
Hello, I’m trying to follow the syntax of a script from a journal website.
In order to create a regression formula used later in the script, the
regression matrix must have column names “X1�, “X2�, etc. I have tried
to assign these column names to my matrix ScoutRSM.mat using a for loop, but I
don’t know how to interpret the error message. Suggestions? Thanks, Paul
====================================================
====== instructions about dimnames(X)[[2]] = "X1","X2",... =======
====================================================
function(binstr)
{
# makes formula for regression
# must make sure dimnames(X)[[2]] = "X1","X2",...
ind<-which(binstr==1)
rht<- paste("X", ind, sep="", collapse="+")
ans<-paste("y ~ ", rht)
return(as.formula(ans))
}
#######################################
############## my for loop ##############
#######################################
for (i in 1:dim(ScoutRSM.mat)[2] {
colnames(ScoutRSM.mat)[i]<- paste("X", i, sep = “�))
}
for(i in 1:dim(ScoutRSM.mat)[2]) {
+ colnames(ScoutRSM.mat)[i]<- paste("X",i, sep = "")
+ }
Error in `colnames<-`(`*tmp*`, value = "X1") :
length of 'dimnames' [2] not equal to array extent
Hi Paul,
You don't really need the loop, try:
colnames(ScoutRSM.mat)<-paste("X",1:dim(ScoutRSM.mat)[2],sep="")
Jim
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