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Logfile for snewton not available.
This package probably failed to build. See the build log for the source package:
Thu Apr 5 13:27:37 2018: Building tarball for package snewton (SVN revision 1724) using R version 3.5.0 alpha (2018-04-04 r74529) ... * checking for file ‘snewton/DESCRIPTION’ ... OK * preparing ‘snewton’: * checking DESCRIPTION meta-information ... OK * installing the package to build vignettes * creating vignettes ... ERROR Quitting from lines 149-203 (SNewton.Rmd) Error: processing vignette 'SNewton.Rmd' failed with diagnostics: could not find function "optimr" Execution halted Run time: 2.57 seconds.