Null values In R.

My problem is largely when i attempt to use correlation for my data...
xcc <- cor(a);

The  error i get is as follows

Error in cor(a) : missing observations in cov/cor

As Daniel suggested, it is always best to use the function's parameter to
handle NULLs. In other cases, it could help to do 

a <- na.omit(a)

but be careful: this may throw away to many rows when you have more than 2
columns.

Dieter

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