[Rd] missing value break my if clause and crash my program

Uwe Ligges ligges at statistik.tu-dortmund.de
Thu Mar 1 19:52:09 CET 2012

On 29.02.2012 13:36, zisheng xing wrote:
> I have a program which is designed to read through a dbf file and carry out certain amount of further calculation if one condition obtained from the newly read line. The condition to determine if the calculation can be done is a if-clasue (i.e. if(m>0). Unfortunately, when m is missing, the program crashed. Just wonder who can help me out.

1. Please ask questions on R-help after reading its posting guide. 
R-devel is for development purposes.

2. Your code results in an ERROR rather than a crash.

3. Check if m exists before you compare it to some value.

Uwe Ligges

> Thanks
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