Hello all, While preparing for a workshop I was running through the code for the Reproducible Research with R lessons and I found an odd behavior that I have not encountered before in the [dplyr tutorial]( https://swcarpentry.github.io/r-novice-gapminder/13-dplyr/).
If I load load ‘gapminder' and ‘dplyr' and then run the first line of code: `mean(gapminder[gapminder$continent == "Africa", "gdpPercap"])` Returns: `[1] NA Warning message: In mean.default(gapminder[gapminder$continent == "Africa", "gdpPercap"]) : argument is not numeric or logical: returning NA` If I only load ‘gapminder' the code works properly. I’ve replicated this on four different machines and am scratching my head as to why this error occurs when I load ‘dplyr’. Any thoughts? Chris Hamm
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