R用动态值子集数据框列行

Question

I have data frame named dcWCTOneSubTotal which has column T1Description having multiple values .

How to pass each value after storing this in a variable like descriptionName. It returns null if i pass value as T1Description=='descriptionName' to subset function.

It returns rows if i pass value as T1Description=="abc" or T1Description=="xyz" to subset function.

I want to call this

bar.Chart.D.F.1 <- subset(dcWCTOneSubTotal ,  T1Description=='descriptionName')

inside function so that I can have different subsets each time for different T1Description column.

Answer 1

As suggested in the comments - just omit the quotes:

dcWCTOneSubTotal <- data.frame(T1Description = c("a","b","c","a","c","b"),
                               T2Description = 1:6, 
                               stringsAsFactors = FALSE)

dcWCTOneSubTotal
#   T1Description T2Description
# 1             a             1
# 2             b             2
# 3             c             3
# 4             a             4
# 5             c             5
# 6             b             6


sub = "a"
subset(dcWCTOneSubTotal ,  T1Description==sub)
#   T1Description T2Description
# 1             a             1
# 4             a             4

sub= "b"
subset(dcWCTOneSubTotal ,  T1Description==sub)
#   T1Description T2Description
# 2             b             2
# 6             b             6