[R] Cannot use negative argument in function

[John Kane]

Do an str() on the data.  It looks like temp is a factor and I doubt that factors can be negative.

John Kane
Kingston ON Canada


> -----Original Message-----
> From: svfilhol at alaska.edu
> Sent: Tue, 28 Feb 2012 22:03:19 -0800 (PST)
> To: r-help at r-project.org
> Subject: [R] Cannot use negative argument in function
> 
> Hi,
> 
> today i wrote a function in R of the type:
> 
> index.refraction <- function(Temp,Press, RH, CO2)
> 
> When i try to plug a negative number in Temp, i got this type of error:
> 
> "
> n <- index.refraction(Temp= -40,100,80,CO2)
> Messages d'avis :
> 1: In Ops.ordered(left, right) : '-' is not meaningful for ordered
> factors
> 2: In Ops.factor(left, right) : - not meaningful for factors
> 3: In Ops.factor(left, right) : - not meaningful for factors
> 4: In Ops.ordered(left, right) : '-' is not meaningful for ordered
> factors
> 5: In Ops.factor(left, right) : - not meaningful for factors
> 6: In Ops.factor(left, right) : - not meaningful for factors
> "
> 
> Do you have any idea what can be the reason?
> Thanks
> Simon
> 
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