knittr: non-numeric argument to binary operator

We need some idea of what you were actually doing (i.e code, data, ... )

See http://adv-r.had.co.nz/Reproducibility.html for some suggestions.
John Kane
Kingston ON Canada
-----Original Message-----
From: mark at markdrummond.ca
Sent: Sun, 26 Apr 2015 16:41:32 -0400
To: r-help at stat.math.ethz.ch
Subject: [R] knittr: non-numeric argument to binary operator

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.

--
Cheers, Mark

Mark Drummond
mark at markdrummond.ca

When I get sad, I stop being sad and be Awesome instead. TRUE STORY.

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knittr: non-numeric argument to binary operator

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