double/integer (PR#7687)

Full_Name: Chris Spencer
Version: 2.0.1
OS: Linux
Submission from: (NULL) (163.1.211.93)


Dear R team,

I realise that the following is a bit unsafe (the combination of doubles and
integers), however I wondered whether the following behaviour is expected:

#Test R
test <- vector(length=100000);
for(i in 1:100000){temp = i/1000; test[i] = (i == temp*1000);}
table(test);

test
FALSE  TRUE
 1472 98528

For example I can also make the following error:

 as.integer(259.765*1000);

[1] 259765

 as.integer(259.763*1000);

[1] 259762

Would you expect this to be the case and if so why?
Thanks for your help.

Chris Spencer