Re: [R] How to apply calculations in "formula" to "data frame"

[Sören Vogel]

`model.matrix` was what I was looking for.

Thanks,
Sören

> On 28.03.2017, at 16:57, peter dalgaard  wrote:
> 
> 
>> On 28 Mar 2017, at 16:14 , Sören Vogel  wrote:
>> 
>> Hello
>> 
>> Ho can I apply a formula to a data frame?
> 
> 
> That would depend on whether the formula has any special interpretation.
> 
> If if is just an elementary expression, then it would be like 
> 
> eval(For1[[3]], Data, environment(For1))
> 
> but you are using "." to represent... what exactly?
> 
> One possibility is model.matrix(For1, Data)
> 
> but I'm not at all sure that that is what you want.
> 
> -pd
> 
>> 
>> library("formula.tools")
>> Data <- data.frame("v1" = rnorm(31), "v2" = runif(31), "v3" = sample(1:7, 
>> 31, repl=T), "v4" = rlnorm(31))
>> For1 <- as.formula(v1 ~ .^3)
>> Lhs <- Data[, formula.tools::lhs.vars(formula)]
>> Rhs <- apply_formula_to_data_frame_and_return_result(data, formula) # ???
>> 
>> Thank you,
>> Sören
>> 
>> __
>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
> 
> -- 
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Office: A 4.23
> Email: pd@cbs.dk  Priv: pda...@gmail.com
> 
> 
> 
> 
> 
> 
> 
> 
> 

__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Re: [R] How to apply calculations in "formula" to "data frame"

[peter dalgaard]

> On 28 Mar 2017, at 16:14 , Sören Vogel  wrote:
> 
> Hello
> 
> Ho can I apply a formula to a data frame?


That would depend on whether the formula has any special interpretation.

If if is just an elementary expression, then it would be like 

eval(For1[[3]], Data, environment(For1))

but you are using "." to represent... what exactly?

One possibility is model.matrix(For1, Data)

but I'm not at all sure that that is what you want.

-pd

> 
> library("formula.tools")
> Data <- data.frame("v1" = rnorm(31), "v2" = runif(31), "v3" = sample(1:7, 31, 
> repl=T), "v4" = rlnorm(31))
> For1 <- as.formula(v1 ~ .^3)
> Lhs <- Data[, formula.tools::lhs.vars(formula)]
> Rhs <- apply_formula_to_data_frame_and_return_result(data, formula) # ???
> 
> Thank you,
> Sören
> 
> __
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd@cbs.dk  Priv: pda...@gmail.com

__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

[R] How to apply calculations in "formula" to "data frame"

[Sören Vogel]

Hello

Ho can I apply a formula to a data frame?

library("formula.tools")
Data <- data.frame("v1" = rnorm(31), "v2" = runif(31), "v3" = sample(1:7, 31, 
repl=T), "v4" = rlnorm(31))
For1 <- as.formula(v1 ~ .^3)
Lhs <- Data[, formula.tools::lhs.vars(formula)]
Rhs <- apply_formula_to_data_frame_and_return_result(data, formula) # ???

Thank you,
Sören

__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.