[R] format, zero.print and NA

[rexi]

Hallo,

I need to print a matrix where zeros as well as NA occuring. The NA must be
keept and the zeros have to be converted to ".".
I used format and zero.print, but as soon as the matrix contains NA format
gives an error message. Taking out the zero.print option or the NA's results
in no problems.
eg:

a<-c(1,0,NA)
format(a,zero.print=".")

results in a error message

Is there any solution

Thanks

rexi

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