[R] Errors or warnings for non-existent data
Good Evening Is there a setting that I can change in R so that I get either a warning or an error message if I reference non-existent data in a data frame? For example I get no warning or error message with the following: > set.seed(2013) > df0=data.frame(cbind(x=rnorm(1000),y=rnorm(1000))) > df0$z=df0$w > head(df0) x y 1 -0.09202453 1.51179695 2 0.78901912 -0.60084547 3 -0.66744232 -0.02180077 4 1.36061149 -0.74909011 5 1.50768816 -2.25128946 6 -2.60754997 0.43708800 Thanks Joe [[alternative HTML version deleted]] __ R-help@r-project.org mailing list 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] A question with respect to capturing output from a shell command
Good Evening
I have a set of fortran code that prints results to the screen when executed
from the dos shell under windows.
I want to capture the screen output directly into R when the code is executed
via a shell command. I find that we can do this when the code is compiled
with Lahey's 32 bit compiler but can not do this when the code is compiled with
gfortran. Both .exe objects display the results properly when executed from
the dos shell. Can anyone explain why this is happening. The following
demonstrates:
Fortran code
!*
program writetest
!*
write(*,*) 'Hello World'
stop
end
!
Compile commands (LF95 calls Lahey's compiler and creates writetest.exe)
lf95 writetest.for
gfortran writetest.for -o Gwritetest.exe
R script
tmp1=shell('writetest.exe',intern=TRUE)
tmp2=shell('Gwritetest.exe',intern=TRUE)
> tmp1
[1] "Hello World"
> tmp2
character(0)
I would sincerely appreciate if someone could explain why this is happening and
send me a note at:
brwin...@aol.com
Joe.
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[R] R and LINGO?
Good Evening Does anyone in the R-help list have experience writing an R wrapper that interfaces with the commercial packages LINGO and/or LINDO.api from R? I have a set of nonlinear/mixed integer problems that solve nicely with LINGO but I would like to use R to set the problems up and analyze/plot the solutions dynamaically. I have searched the archives and have not found any R packages that enable me to obtain solutions to mixed integer problems with linear and quadratic constraints. If I have missed one, we would be happy to hear which package we could consider as an alternative to LINGO. Any help or suggestions would be appreciated. Brwin338 [[alternative HTML version deleted]] __ R-help@r-project.org mailing list 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] Difference between 10 and 10L
Good Evening We have been searching through the R documentation manuals without success on this one. What is the purpose or result of the "L" in the following? n=10 and n=10L or c(5,10) versus c(5L,10L) Thanks Joe Thanks Joe [[alternative HTML version deleted]] __ R-help@r-project.org mailing list 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.
