Help with a function

Dear R users,


I?m trying to build a function to select random samples idf?s from a
database.
So, my data frame had 2 columns and 575 rows. Follow bellow an example of my
database
Idf1	casod
12	1
14	1
15	1
16	1
17	3
18	3
19	3
21	3
25	1
24	1
26	1
28	1
29	3
32	3
33	3
35	1
36	3
37	1
48	3

So my function is

blinding=function(sample){
  sort=sample(idf1,10,replace=F) 
  return(sort2)
}

It is pretty simple and I would like to add one more step in my choice. I
would like to link my choice to casod stats. Thus if casod==3 sample would
be random idfs could not be an idf with casod=1. Does someone can help me?




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