if statement - Selecting elements from Data Frame which meet an if condition inside a For Loop R -

i'm working data frame inside function,and have problem in syntaxis. frame i'm working with:

c    id nobs 1   1  117 2   2 1041 3   3  243 4   4  474 5   5  402 6   6  228 7   7  442 8   8  192 9   9  275 10 10  148

and code i'm using.

threshold=250 c (i in c[1]){      if(threshold > any(c[i,2])){         print(c[i,1])     } }

what want first element of data frame condition met, result: [1] 1 2 3 4 5 6 7 8 9 10. has be: 1 3 6 8 10

any appreciated. in advance.

let's call data.frame x avoid conflict of function name c.

following syntax, should be:

for (i in seq_len(nrow(x))){      if(threshold > x[i,2]){         print(x[i,1])     } }

or simply,

x[x[,2] < threshold, 1]

Lix