[R] Use of ifelse for indicating specific rownumber

[joe1985]

Hello

I have a dataset named "b2" with 1521 rows, in that dataset i have 64 rows
containing specific information.

the rownumbers with specific info are:

+ i
 [1]   22   53  104  127  151  196  235  238  249  250  263  335  344  353 
362  370  389  422  458  459  473  492  502  530  561  624  647  651  666 
671
[31]  715  784  791  807  813  823  830  841  862  865 1036 1051 1062 1068
1092 1109 1171 1187 1283   1293 1325 1335 1342 1360 1379 1414 1419 1425 1447
1452
[61] 1465 1489 1512 1518

So what i want is that everytime the rownumber equals a number in "i" (which
obviously indicate a rownumber i b2), i want it indicated in a vector called
b2$totalvac. Fx. in rownumber 22 in b2 the 
b2$totalvac vector should have the value 1.

So thougth of  b2$totalvac <- ifelse(,1,0), but i don't what to put as the
"if"-sentence.

Hope you can help me
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