elric2718/gitblog

基于git issue的轻量级个人博客模板。

gitblog's Issues

Issues of Seagate external drive on MacOS

NFTS issue

Due to historical reasons, Apple does not like Windows, so it does not embrace the NFTS format which is widely used on Windows system. As a consequence, external drives of NFTS format can only be read on MacOS. There are two solutions to this problem.

• Use the Mounty app.
• Change the format from NFTS to ExFat. (Warning: this procedure will erase everything on the drive).

Extended file attribute

Due to some reason (I have not yet figured out), some files in the external hard drive will have the Extended file attribute, which can be checked by ls -l@. As a consequence, these files cannot be opened or copied.

Make R packages

Make a R package based on devtools (without C/Cpp functions)

Procedure

1. Download needed package
   install.packages("devtools"); install.packages("roxygen2")
2. Create the package folder
   devtools::create("path_to_myPkg")
   Then go to this folder, setwd("path_to_myPkg")
3. Copy R scripts in path_to_myPkg/R. If external packages are used, use otherPkg::func. Accordingly, update used packages in DESCRIPTION.
4. Document functions

@param
@return
@export
Then, devtools::document(). If the package roxygen2 is not used, need to update NAMESPACE manually to export needed packages. To generate a vignette, use usethis::use_vignette("introduction").

5. Install the package
   devtools::install()
   or push the folder to github, then
   devtools::install_github("yourusername/myPkg")

References

• Making Your First R Package

Make a R package with C/Cpp functions

Procedure

Caveats

• To fix fatal error: Rcpp.h: No such file or directory, need to add LinkingTo: Rcpp in DESCRIPTION. This can also be avoided by using package.skeleton() when creating the package folder.
• A macOS update (>=10.15) uninstalled the XCode developer tools.

To fix fatal error: 'stdio.h' file not found, do
export CPATH="/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/"

• When building R package using R CMD build, it might need an appropriate R version. If the default one is not the wanteded, try /usr/local/bin/R.
• For errors related to math.h, replace #include_next<math.h> with #include</Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h>.
• There might be some errors in R CMD check, try first install.packages(pkgKitten) before package.skeleton.

References

• 3 steps to build own R package – Rcpp
• Building an R package that includes RcppArmadillo code
• Catalina C++: Using headers yield error: no member named 'signbit' in the global namespace](https://stackoverflow.com/questions/58628377/catalina-c-using-cmath-headers-yield-error-no-member-named-signbit-in-th)
• RcppArmadillo.package.skeleton( "foobar" ) produces errors in checking.