combinations - If multiple condition not giving output in r -


i have dataframe

df= data.frame(id=paste(rep("a",7),c(1:7),sep = ""),                col2=c(12,10,1,2,5,10,8),                col3=c(200,150,180,450,100,130,200))

i'm trying check combination of element sum upto particular number , same elements checking sumproduct not giving output e.g dataframe df these values make sum of 25, so

  col2  col3     10   150     5    100     10   130  =sumproduct((e3:e5,d3:d5) [excel formula]  output = 3300

and expect output following code a2,a5,a6

this code

for(i in 1:nrow(df)){   comb <- combn(1:nrow(df), i, fun = null, simplify = true)   (j in 1:ncol(comb)){     subvec <- comb[,j]     <- sum(df[subvec,2])       b <- sum(df[i, 2] * df[i, 3])     if(a == 25 && b == 3300){       print(df[subvec,1])     }   } }


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