Dear Vladimir, thank you for your reply.
The model syntax is not simple though and the parser needs to look at the meaning in SEM terms to accept or reject certain things. Moreover, this is only a first step and later other calculations need to be done in C++, which is why I find it important to know exactly why the code works in R console but not in RStudio, and of course what can be done to make it work in RStudio also. Kind regards, Luc De Wilde ________________________________________ Van: Vladimir Dergachev <volo...@mindspring.com> Verzonden: dinsdag 12 november 2024 18:15 Aan: Luc De Wilde <luc.dewi...@ugent.be> CC: r-package-devel@r-project.org <r-package-devel@r-project.org>; Yves Rosseel <yves.ross...@ugent.be> Onderwerp: Re: [R-pkg-devel] New package with C++ code causes R abort in RStudio, not in R console. Hi Luc, The standard tools for writing parsers are "flex" and "bison" - they generate code automatically and so can save you a lot of effort. For language with simple syntax you can get away with just using "flex". Here are some examples: Flex: https://westes.github.io/flex/manual/Simple-Examples.html#Simple-Examples Bison: https://www.gnu.org/software/bison/manual/bison.html#Infix-Calc best Vladimir Dergachev On Tue, 12 Nov 2024, Luc De Wilde wrote: > Dear R package developers, > > I'm helping with the development of the lavaan package (see > https://lavaan.ugent.be/) and currently writing a C++ version of the parser > of the model syntax in lavaan. The package with C++ code is in > https://github.com/lucdw/lavaanC. > > When testing with a bunch of models, there is one model that causes an abort > of the R session in RStudio (on Windows), but in the R console or in a batch > job it causes no errors. The model is the following : > model <- ' > F1 =~ "a b"*X1 > F2 =~ a * X1 + 3*X2 # dat is hier een beetje commentaar > # efa block 2 > efa("efa2")*f3 + > efa("efa2")*f4 =~ y1 + y2 + y3 + y1:y3 > f4 := 3.14159 * F2 > F1 ~ start(0.76)*F2 + a*F2 > a == (b + f3)^2 > b1 > exp(b2 + b3) ' > > and the translation can be tested - after installing lavaanC - with > > lavaanC::lav_parse_model_string_c(model) > > As mentioned, this causes an abort of the R session when executed in RStudio > on Windows (10 or 11), but passes without problem in the R console or a batch > job. > > Because many users are using RStudio I 'd like to tackle this problem, but > don't know how to pinpoint the cause of the problem. I hope some of you have > an idea how to handle this problem ... > > All the best, > > > Luc De Wilde > > ______________________________________________ > R-package-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-package-devel > ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
