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'Require' returns uninformative error if package is already loaded [minor] #92

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tati-micheletti opened this Issue Jan 7, 2019 · 1 comment

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tati-micheletti commented Jan 7, 2019

reprex:

reproducible::Require(raster) # works fine
reproducible::Require(raster) # Error in Require(raster) : packages should be a character vector or a name
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eliotmcintire commented Jan 7, 2019

That is actually very imformative, and solves your problem:

reproducible::Require(raster) # works fine
reproducible::Require(raster) # Error in Require(raster) : packages should be a character vector or a name
reproducible::Require("raster") # works fine, with no error or message

It "tries" the first time to use the "object" called raster... since it does not exist, it tries to interpret it as a character string. The second time, the package is loaded, so the "object" called raster does exist. So, it tries to load that object (it is the function raster::raster). The third, and correct time, is the best way to always load a library/package in R. It does "work" in base R to use require(raster) ... but that not great for Require for some other reasons.

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