Reinstall packages after updating R

When you change R version, you must reinstall manually all your installed packages.

# before to update

 pkgins <- rownames(installed.packages())
save(pkgins, file = "pkgins.Rdata")

 # after updating

 load(file = "pkgins.Rdata")
for (pkg in pkgins[is.na(match(pkgins, rownames(installed.packages())))]) {
  if (pkg %in% pkgins[is.na(match(pkgins, rownames(installed.packages())))]) {
    install.packages(pkg)
  }
}

The packages shown with:
pkgins[is.na(match(pkgins, rownames(installed.packages())))]
Are not available in CRAN or produced an error when installed with new version.

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