[R] result numeric(0) when using variable1[which(variable2="max(variable2)"]

[Nerak]

Dear all,
I have a question about the knowing for which row I have the max value of
one of my variables.
I calculated the Rsquared for different columns and made a list to gather
them. I unlisted this list to create a vector with this values. I want to
know for which column I have the max value of Rsquared.  
The columns were always named in the same way. They always start with
results4$depth_ following by the number. The numbers are constructed as:
seq(1,10,0.1). But if the R squared values are now in 1 column, I don’t know
for which column they are calculated. So I made a new data frame with both
columns:
R2 <- unlist(LIST) 
Cvalue <- c(seq(1,10,0.1)) 
results5 <- data.frame(Cvalue,R2) 

# I know I can calculate the max value of Rsquared by this way: 

max(results5$R2) 

# now I want to know to which Cvalue this belongs. I would write it like
this: 
results5$Cvalue[which(results5$R2 == "max(results5$R2)")] 
# But I always get the solution: 
numeric(0) 
# I don’t know if these Rsquared values are in a kind of format that this
doesn’t work? (I used before for similar things, and I experienced that for
example it cannot works if R recognizes the values as a date).  Maybe
because it’s with a lot of decimals? (eg 2.907530e-01) I know that
max(results5$R2) is in this example 0.6081547 and I can see that that
belongs to the Cvalue == 1.8. It works in the opposite way. 
results5$R2[which(results5$Cvalue == "1.8")] 
# But neither 
results5$Cvalue[which(results5$R2 == "0.6081547")] 
# nor 
results5$Cvalue[which(results5$R2 == "max(results5$R2)")] 
# works…

I hope someone can help me with this problem
Kind regards
Nerak

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