Re: [R] inplace assignment: solution
I worked this out over the weekend. I appreciate that using temporary
variables would be simpler but I think this makes for quite readable
code:
# in RProfile.site
inplace - function (f, arg=1)
eval.parent(call(-,substitute(f)[[arg+1]], f),2)
# examples in code
inplace(foo[bar,baz] *2)
# or
inplace(paste(foo[bar,baz], 1:10))
# or
inplace(sub(blah, bleh, foo[bar,baz]), 3)
cheers
Dave
On 16/06/06, David Hugh-Jones [EMAIL PROTECTED] wrote:
It's more a general point about having to write things out twice when
you do assignments. I could also have written:
data.frame[some.condition another.condition, big.list.of.columns] -
data.frame[some.condition another.condition, big.list.of.columns] * 2 + 55
or anything else. Equally, there could be any method of subsetting, or
any expression that can be an assignment target, on the left hand
side:
data.frame[[some.complex.expression.for.columnames]]
-data.frame[[some.complex.expression.for.columnames]] * 333 + foo *
56
rownames(matrix)[45:53] - paste(rownames(matrix)[45:53], blah)
David
On 16/06/06, Adaikalavan Ramasamy [EMAIL PROTECTED] wrote:
I do not fully understand your question but how about :
inplace - function( df, cond1, cond2, cols, suffix ){
w - which( cond1 cond2 )
df - df[ w, cols ]
paste(df, suffix)
return(df)
}
BTW, did you mean colnames(df) - paste(colnames(df), suffix) instead
of paste(df, suffix) ?
Regards, Adai
On Fri, 2006-06-16 at 10:23 +0100, David Hugh-Jones wrote:
I get tired of writing, e.g.
data.frame[some.condition another.condition, big.list.of.columns] -
paste(data.frame[some.condition another.condition,
big.list.of.columns], foobar)
I would a function like:
inplace(paste(data.frame[some.condition another.condition,
big.list.of.columns], foobar))
which would take the first argument of the inner function and assign
the function's result to it.
Has anyone done something like this? Are there simple alternative
solutions that I'm missing?
Cheers
David
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[R] inplace assignment
I get tired of writing, e.g. data.frame[some.condition another.condition, big.list.of.columns] - paste(data.frame[some.condition another.condition, big.list.of.columns], foobar) I would a function like: inplace(paste(data.frame[some.condition another.condition, big.list.of.columns], foobar)) which would take the first argument of the inner function and assign the function's result to it. Has anyone done something like this? Are there simple alternative solutions that I'm missing? Cheers David __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] inplace assignment
I do not fully understand your question but how about :
inplace - function( df, cond1, cond2, cols, suffix ){
w - which( cond1 cond2 )
df - df[ w, cols ]
paste(df, suffix)
return(df)
}
BTW, did you mean colnames(df) - paste(colnames(df), suffix) instead
of paste(df, suffix) ?
Regards, Adai
On Fri, 2006-06-16 at 10:23 +0100, David Hugh-Jones wrote:
I get tired of writing, e.g.
data.frame[some.condition another.condition, big.list.of.columns] -
paste(data.frame[some.condition another.condition,
big.list.of.columns], foobar)
I would a function like:
inplace(paste(data.frame[some.condition another.condition,
big.list.of.columns], foobar))
which would take the first argument of the inner function and assign
the function's result to it.
Has anyone done something like this? Are there simple alternative
solutions that I'm missing?
Cheers
David
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] inplace assignment
It's more a general point about having to write things out twice when
you do assignments. I could also have written:
data.frame[some.condition another.condition, big.list.of.columns] -
data.frame[some.condition another.condition, big.list.of.columns] * 2 + 55
or anything else. Equally, there could be any method of subsetting, or
any expression that can be an assignment target, on the left hand
side:
data.frame[[some.complex.expression.for.columnames]]
-data.frame[[some.complex.expression.for.columnames]] * 333 + foo *
56
rownames(matrix)[45:53] - paste(rownames(matrix)[45:53], blah)
David
On 16/06/06, Adaikalavan Ramasamy [EMAIL PROTECTED] wrote:
I do not fully understand your question but how about :
inplace - function( df, cond1, cond2, cols, suffix ){
w - which( cond1 cond2 )
df - df[ w, cols ]
paste(df, suffix)
return(df)
}
BTW, did you mean colnames(df) - paste(colnames(df), suffix) instead
of paste(df, suffix) ?
Regards, Adai
On Fri, 2006-06-16 at 10:23 +0100, David Hugh-Jones wrote:
I get tired of writing, e.g.
data.frame[some.condition another.condition, big.list.of.columns] -
paste(data.frame[some.condition another.condition,
big.list.of.columns], foobar)
I would a function like:
inplace(paste(data.frame[some.condition another.condition,
big.list.of.columns], foobar))
which would take the first argument of the inner function and assign
the function's result to it.
Has anyone done something like this? Are there simple alternative
solutions that I'm missing?
Cheers
David
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
