dear all,
i've looked at the r-intro (chapter 10, writing your own functions) and searched the r-help archives but am still stuck at the following.
i have a simple function, something like:
myhist<-function(yvar) {
y<-subset(myframe,yvar>1 & yvar<=150000,select=yvar)
attach(y)
hist(yvar)
}
calling it as follows:
myhist(x1)
gives the following error:
Error in attach(y) : attempt to set an attribute on NULL
what am i doing wrong here?
thanks in advance, edwin
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