if between 500-600 give 550

I have a data frame somewhat like this: 

myframe <- data.frame (ID=c(2,3,4,5), Hunger =c(415,452,550,318 ))
myframe

Now I would like to add a column to the right which summarizes the values
for Hunger somewhat to reduce the number of values: If the values for Hunger
are between 
300-400 I would like to insert the number 350, 
between 
400-500 insert 450
between 
500-600 insert 550 

Does anyone know how? Cause I don't and my brain already hurts. Can't be
that difficult, right?

myframe$grpH <- c(350, 450, 550)[ 

findInterval(myframe$Hunger, c(300, 400, 500, 600) ) ]

myframe

ID Hunger grpH
1  2    415  450
2  3    452  450
3  4    550  550
4  5    318  350

Please note that your specification had overlapping intervals and that 'findInterval' by default uses closed intervals on the left and open intervals on the right. (This is the opposite of the default behavior of cut(). ) So I suppose you could say R's implementations are just as ambiguous as your problem specification.

myframe$grpHc <- cut(myframe$Hunger, breaks=c(300, 400, 500, 600), labels=c("350", "450", "550") )
myframe

ID Hunger grpH grpHc
1  2    415  450   450
2  3    452  450   450
3  4    550  550   550
4  5    318  350   350

Note also that cut returns a factor:

 lapply(myframe, class)

$ID
[1] "numeric"

$Hunger
[1] "numeric"

$grpH
[1] "numeric"

$grpHc
[1] "factor"

David Winsemius, MD
Alameda, CA, USA