Re: [Rd] R packages to send plottable data to external apps
I think r-package-devel is a better place for this. CC'ing there. On Sun, 27 Aug 2023 at 23:50, Mike Marchywka wrote: > > I was curious what R packages, or indeed any other applications, exist > to plot streamed data from arbitrary data generators. It need not > be publication quality plotting but it should be easy to use like > an oscilloscope. The last time I checked, there wasn't any R package suitable for plotting high-throughput streaming data. There's a nice command-line utility called trend [1] that I extensively used in the past as an oscilloscope to visualize the output from a DAQ card. I don't see any new development there, but it does exactly what it promises; it's easy to use, quite configurable and very fast. Old but gold. I also explored VisPy, which is much more ambitious, but at that time the API had a limitation that didn't allow me to achieve what I required, and I haven't looked at it ever since, but the project seems in good shape. [1] https://www.thregr.org/wavexx/software/trend/ [2] https://vispy.org/ Hope it helps, Iñaki > I was working on something called datascope that I > am using for 1D finite difference monitoring and recently interfaced it > to freefem. I also created an R package. If there is any interest in something > like this I guess I could put it up somewhere when it is more usable > or if you can suggest some similar popular packages that would be good > too. Is there something I could drop-in to the attached code and get > something like the attached output that could also be switched to other > data sources? This right now works via linux fifo and somewhat by UDP. > It can queue data and stop making it if no one seems to be consuming > it depending on the channel. > > Thanks. > > Mike Marchywka > 44 Crosscreek Trail > Jasper GA 30143 > was 306 Charles Cox Drive Canton, GA 30115 > 470-758-0799 > 404-788-1216 > > > __ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel -- Iñaki Úcar __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
[Rd] R packages to send plottable data to external apps
I was curious what R packages, or indeed any other applications, exist to plot streamed data from arbitrary data generators. It need not be publication quality plotting but it should be easy to use like an oscilloscope. I was working on something called datascope that I am using for 1D finite difference monitoring and recently interfaced it to freefem. I also created an R package. If there is any interest in something like this I guess I could put it up somewhere when it is more usable or if you can suggest some similar popular packages that would be good too. Is there something I could drop-in to the attached code and get something like the attached output that could also be switched to other data sources? This right now works via linux fifo and somewhat by UDP. It can queue data and stop making it if no one seems to be consuming it depending on the channel. Thanks. Mike Marchywka 44 Crosscreek Trail Jasper GA 30143 was 306 Charles Cox Drive Canton, GA 30115 470-758-0799 404-788-1216 __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] [External] Re: Calling a replacement function in a custom environment
On Sun, 27 Aug 2023, Duncan Murdoch wrote: I think there isn't a way to make this work other than calling `is.na<-` explicitly: x <- b$`is.na<-`(x, TRUE) Replacement functions are not intended to be called directly. Calling a replacement function directly may produce an error, or may just do the wrong thing in terms of mutation. It seems like a reasonable suggestion to make b$is.na(x) <- TRUE work as long as b is an environment. I do not think it is a reasonable suggestion. The reasons a::b and a:::b were made to work is that many users read these as a single symbol, not a call to a binary operator. So supporting this helped to reduce confusion. Allowing $<- to "work" on environments was probably a mistake since environments behave differently with respect to duplication. Disallowing it entirely may be too disruptive at this point, but disallowing it in complex assignment expressions may be necessary to prevent mutations that should not happen. (There are open bug reports that boil down to this.) In any case, complicating the complex assignment code, which is already barely maintainable, would be a very bad idea. Best, luke If you wanted it to work when b was a list, it would be more problematic because of partial name matching. E.g. suppose b was a list containing functions partial(), partial<-(), and part<-(), and I call b$part(x) <- 1 what would be called? Duncan Murdoch On 27/08/2023 10:59 a.m., Konrad Rudolph wrote: Hello all, I am wondering whether it’s at all possible to call a replacement function in a custom environment. From my experiments this appears not to be the case, and I am wondering whether that restriction is intentional. To wit, the following works: x = 1 base::is.na(x) = TRUE However, the following fails: x = 1 b = baseenv() b$is.na(x) = TRUE The error message is "invalid function in complex assignment". Grepping the R code for this error message reveals that this behaviour seems to be hard-coded in function `applydefine` in src/main/eval.c: the function explicitly checks for `::` and :::` and permits those assignments, but has no equivalent treatment for `$`. Am I overlooking something to make this work? And if not — unless there’s a concrete reason against it, could it be considered to add support for this syntax, i.e. for calling a replacement function by `$`-subsetting the defining environment, as shown above? Cheers, Konrad __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel -- Luke Tierney Ralph E. Wareham Professor of Mathematical Sciences University of Iowa Phone: 319-335-3386 Department of Statistics andFax: 319-335-3017 Actuarial Science 241 Schaeffer Hall email: luke-tier...@uiowa.edu Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] Calling a replacement function in a custom environment
I think there isn't a way to make this work other than calling `is.na<-` explicitly: x <- b$`is.na<-`(x, TRUE) It seems like a reasonable suggestion to make b$is.na(x) <- TRUE work as long as b is an environment. If you wanted it to work when b was a list, it would be more problematic because of partial name matching. E.g. suppose b was a list containing functions partial(), partial<-(), and part<-(), and I call b$part(x) <- 1 what would be called? Duncan Murdoch On 27/08/2023 10:59 a.m., Konrad Rudolph wrote: Hello all, I am wondering whether it’s at all possible to call a replacement function in a custom environment. From my experiments this appears not to be the case, and I am wondering whether that restriction is intentional. To wit, the following works: x = 1 base::is.na(x) = TRUE However, the following fails: x = 1 b = baseenv() b$is.na(x) = TRUE The error message is "invalid function in complex assignment". Grepping the R code for this error message reveals that this behaviour seems to be hard-coded in function `applydefine` in src/main/eval.c: the function explicitly checks for `::` and :::` and permits those assignments, but has no equivalent treatment for `$`. Am I overlooking something to make this work? And if not — unless there’s a concrete reason against it, could it be considered to add support for this syntax, i.e. for calling a replacement function by `$`-subsetting the defining environment, as shown above? Cheers, Konrad __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
[Rd] Calling a replacement function in a custom environment
Hello all, I am wondering whether it’s at all possible to call a replacement function in a custom environment. From my experiments this appears not to be the case, and I am wondering whether that restriction is intentional. To wit, the following works: x = 1 base::is.na(x) = TRUE However, the following fails: x = 1 b = baseenv() b$is.na(x) = TRUE The error message is "invalid function in complex assignment". Grepping the R code for this error message reveals that this behaviour seems to be hard-coded in function `applydefine` in src/main/eval.c: the function explicitly checks for `::` and :::` and permits those assignments, but has no equivalent treatment for `$`. Am I overlooking something to make this work? And if not — unless there’s a concrete reason against it, could it be considered to add support for this syntax, i.e. for calling a replacement function by `$`-subsetting the defining environment, as shown above? Cheers, Konrad -- Konrad Rudolph // @klmr [[alternative HTML version deleted]] __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
