BiostatR Blog

 MacOSX 15.3 gcc installed using MacBrew I get this error: ld: warning: search path '/opt/gfortran/lib/gcc/aarch64-apple-darwin20.0/12.2.0' not found ld: warning: search path '/opt/gfortran/lib' not found ld: library 'gfortran' not found I solve it by creating a  ~/.R/Makevars  file like this: FC      = /opt/homebrew/opt/gfortran/bin/gfortran F77     = /opt/homebrew/opt/gfortran/bin/gfortran FLIBS   = -L/opt/homebrew/opt/gfortran/lib Now I can compile package with gfortran

 Since this morning (5/2/2025), I get an error when I try to load optimx package: > library("optimx") Erreur : le chargement du package ou de l'espace de noms a échoué pour ‘optimx’ in dyn.load(file, DLLpath = DLLpath, ...) : impossible de charger l'objet partagé '/Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library/nloptr/libs/nloptr.so' :   dlopen(/Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library/nloptr/libs/nloptr.so, 0x0006): Library not loaded: /opt/homebrew/opt/nlopt/lib/libnlopt.0.dylib   Referenced from: <2A7DAFE2-8123-3555-9569-F28214328E47> /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library/nloptr/libs/nloptr.so   Reason: tried: '/opt/homebrew/opt/nlopt/lib/libnlopt.0.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/opt/nlopt/lib/libnlopt.0.dylib' (no such file), '/opt/homebrew/opt/nlopt/lib/libnlopt.0.dylib' (no such file), '/Libra...

main = expression("Temperature ("*~degree*C*")") main = "Temperature (°C)" main = "Temperature (\u00B0C)" with expression format, the font is lighter. I don't know why.

To update this package, I have been forced to remove it and to install it again. Otherwise, I get an error like this one: Erreur : le chargement du package ou de l'espace de noms a échoué pour ‘stringr’ in dyn.load(file, DLLpath = DLLpath, ...) : impossible de charger l'objet partagé '/usr/lib/R/site-library/stringi/libs/stringi.so' :   libicuuc.so.70: cannot open shared object file: No such file or directory

Ubuntu 24.01  You must first install terra package before install raster package.

The speed is higher using [[n]] then [["x"]]. unname(["x"]) is the slowest.   > Growth        alpha         beta            M            S            K           x0   0.007984356  0.018129643 81.782205061  2.978223538 13.309442413  5.072000000  > system.time({for(i in 1:1E6) K <- Growth[[1]]})    user  system elapsed    0.035   0.000   0.035  > system.time({for(i in 1:1E6) K <- Growth[["alpha"]]})    user  system elapsed    0.083   0.002   0.086  > system.time({for(i in 1:1E6) K <- Growth[1]})    user  system elapsed    0.145   0.004   0.150  > system.time({for(i in 1:1E6) K <- Growth["alpha"]})    user  system elapsed    0.150 ...