R Extract rows where column greater than 40 [duplicate]

Question

Good day I have a data set I got from a txt file

> MyData
   Xdat Ydat
1  1    12
2  2    23
3  3    34
4  4    45
5  5    56
6  6    67
7  7    78

I need to use this set to extract rows that correspond to the case where the 2nd column(Ydat) is greater than 40. Resulting in MyData2

   Xdat Ydat
4  4    45
5  5    56
6  6    67
7  7    78

Answer 1

Simple subsetting will do it -

MyData[which(MyData[,2]>40),]

as @DavidArenburg points out, this works fine:

MyData[(MyData[,2]>40),]