In addition to what has already been suggested, you can use debug (and
subsequently undebug) to browse a function step by step to see what each
step of the function is doing.
For your specific query about match.call(), I suspect that your
'puzzlement' is that you don't know what a function call is
y and z look like
> rbind(x,y,z)
>
> # run formula y~x
> JD <- doit(y~x)
> JD
>
> # run formula y~x+z
> JD2 <- doit(y~x+z)
> JD2
>
>
>
> ____________________
> From: R-help on behalf of Rasmus Liland
>
> Sent: Thursday, March 16, 2023 8:42 AM
> To: r-help
> Subj
В Thu, 16 Mar 2023 14:53:33 +
"Sorkin, John" пишет:
> I am trying to run the lm function on two different formulae:
> 1) y~x,
> 2) y~x+z
A formula is already an unevaluated object that doesn't need further
quoting; thus it can be passed around like a normal variable. It
consists of a call t
G'day John,
For these snippets to produce what I think you want them to produce it
is just necessary to define doit() as follows:
doit <- function(x){
lm(formula=x)
}
R> # run formula y~x
R> JD <- doit(y~x)
R> JD
Call:
lm(formula = x)
Coefficients:
(Intercept)x
0.8403
The first thing to understand is that despite similarity in names,
`match` and `match.call` are doing very different things, which should
not be confused with each other.
For understanding what a function is doing, it is helpful to watch
what it does at each step. With functions like `lm` that ar
t x, y and z look like
rbind(x,y,z)
# run formula y~x
JD <- doit(y~x)
JD
# run formula y~x+z
JD2 <- doit(y~x+z)
JD2
From: R-help on behalf of Rasmus Liland
Sent: Thursday, March 16, 2023 8:42 AM
To: r-help
Subject: Re: [R] Trying to learn how to wr
On 2023-03-16 12:11 +, Sorkin, John wrote:
> (1) can someone point me to an
> explanation of match.call or match
> that can be understood by the
> uninitiated?
Dear John,
the man page ?match tells us that match
matches the first vector against the
second, and returns a vector of indecie
В Thu, 16 Mar 2023 12:11:35 +
"Sorkin, John" пишет:
> (1) can someone point me to an explanation of match.call or match
> that can be understood by the uninitiated? (2) can someone point me
> to a document that will help me learn how to write an "advanced"
> function?
By "advanced" functions
I am trying to understand how to write an "advanced" function. To do so, I am
examining the lm fucnction, a portion of which is pasted below. I am unable to
understand what match.call or match does, and several other parts of lm, even
when I read the help page for match.call or match.
(1) can
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