[R] knittr: non-numeric argument to binary operator

Jeff Newmiller jdnewmil at dcn.davis.CA.us
Sun Apr 26 23:39:00 CEST 2015

Not reproducible [1], so any response likely to be a guess. However, you likely have not put everything that is in your interactive environment into the knitr document, so you are not working with the same data in those two environments.

[1] http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example
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On April 26, 2015 1:41:32 PM PDT, Mark Drummond <mark at markdrummond.ca> wrote:
>knittr is giving me the above error. The code it is failing on is
>multiplying two numeric features of a data frame. I can run the code
>by hand and it works fine, but when I try to knit my document, knittr
>chokes on the same line.
>When kitting:
>Quitting from lines 161-175 (RepData_PeerAssessment2.Rmd)
>Error in storm_data$PROPDMG * storm_data$property_damage_cost_factor :
>  non-numeric argument to binary operator
>Calls: <Anonymous> ... handle -> withCallingHandlers -> withVisible ->
>eval -> eval
>Execution halted
>Running the same lines manually (CTRL+Enter) from the .Rmd file:
>> storm_data$total_damage <-
>+ (storm_data$PROPDMG * storm_data$property_damage_cost_factor) +
>+ (storm_data$CROPDMG * storm_data$crop_damage_cost_factor)
>> str(storm_data$total_damage)
> num [1:902297] 25 2.5 25 2.5 2.5 2.5 2.5 2.5 25 25 ...
>Call me baffled. Any pointers are greatly appreciated at this point.

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