[R] matching by gender and age

[1Rnwb]

Hello R gurus, I have a data set from which i have to extract the gender and
age matched rows from controls and disease group
disease<-paste(rep(c('y','n'),11))
gender<-paste(rep(c('m','f'),11))
mcp<-rnorm(700,1400)
age<-rnorm(32,34)

dat<-data.frame(disease=disease,sex=gender,Dr_age=age[1:22],MCP=mcp[1:22])

I have other categorical variables also to add to the matching. all the
posts I came across are matching for a single column from two
matrix/dataframe. How can i match for multiple variables when all the data
is in one single dataframe





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