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...rror messages. Sorry that I ONLY set my 'PATH' environment variable correctly for R but not for Graphviz. Thank you and Duncan so much for your great help. Howard On Tue Mar 30 18:12:54 EDT 2010, Martin Morgan <mtmorgan at fhcrc.org> wrote: > On 03/30/2010 03:06 PM, HU,ZHENGJUN wrote: >> Hi Martin, >> >> I am 100% sure that I set my 'PATH' environment variable >> correctly >> because all other packages can loaded correctly as well as >> because R can >> be run correctly under both MS DOS and MS Windows XP. Also, I &gt...

Hi All, I tried to install the package of Rgraphviz in the following two ways successfully: source("http://bioconductor.org/biocLite.R") biocLite("Rgraphviz") install.packages(pkgs="C:/Progra~1/R/lib_download/Rgraphviz_1.24.0.zip", lib="C:/Progra~1/R/R-2.10.1/library", repos=NULL) but when I loaded the package though library(Rgraphviz) or

...uot;)$Version >> [1] "1.24.0" >>> graphvizVersion() >> $installed_version >> [1] ?????????2.20.3????????? >> >> $build_version >> [1] ?????????2.20.3????????? >> >> >> >> >> On Wed, Mar 31, 2010 at 9:56 AM, HU,ZHENGJUN <hhu at ufl.edu> wrote: >>> Hi Martin, >>> >>> ??????It is really a 'PATH' problem. After adding C:\Program >>> Files\Graphviz2.20\bin to the 'PATH' environment variable, the >>> Rgraphviz >>> package can be loaded withou...

...z) > Class 'try-error' chr "Error in eval(expr, envir, enclos) : > object > \"x\" not found\n" >> z <- try(eval(parse(text="x <- 1:20"))) >> str(z) > int [1:20] 1 2 3 4 5 6 7 8 9 10 ... >> > > > On 10/10/07, HU,ZHENGJUN <hhu at ufl.edu> wrote: >> Hi All, >> >> I entered a R statement, e.g. 1:20 = x or log("a") on an HTML >> form and passed it to a R-CGI script. Obviously, neither of both >> is a correct R statement or expression. However, my R-CGI script >> cou...

Hi All, When I tried to catch a returned value from a R graphical function or command (e.g., plot, lines, points, abline, title, xyplot, etc.), I always get a NULL value if it is executed correctly. For example: x <- c(1,2,3,4,5,9,13,19,36) plot.Comm <- plot(x) # plot.Comm <- try(eval(plot(x))) then plot.Comm has a NULL value. Obviously, this is not a good way to check if or

Hi All, I entered a R statement, e.g. 1:20 = x or log("a") on an HTML form and passed it to a R-CGI script. Obviously, neither of both is a correct R statement or expression. However, my R-CGI script could not return and report the error message to the Web site even though it received the statement. I tried to use some R built-in functions of try, tryCatch, eval, expression,