Hello,

I apologize in advance for not providing sample data, I'm a very new to R
and can't easily generate appropriate sample data quickly. I'm hoping
someone can offer advice without it.

This code below works and does what I want it to do, which is for a given
row in my dataframe, where the variable "peak.cort" = max, it makes the
value of another variable "max.cort" = to match the value of a third
variable "cortisol" for that row.

*************
index <- raw.saliva.data$peak.cort == 'max'
            raw.saliva.data$max.cort[index] <-
(raw.saliva.data$cortisol[index])
*************

Now, I want to execute this function only if the value of a fourth
variable, "sample" is >1 and <5. I tried to add an ifelse statement to the
code above so that it looks like this:

*************
index <- raw.saliva.data$peak.cort == 'max'
            raw.saliva.data$max.cort[index] <- ifelse(sample>1 && sample<5,
raw.saliva.data$cortisol[index], NA)
*************

and I get this error: Error in sample > 1 :
  comparison (6) is possible only for atomic and list types

I can't figure out how to fix this problem. Any advice is appreciated.

Thank you.
-- 
*Melissa*

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