I noticed taht R cannot understand certain Fortran real constant formats. For instance:

 c14    <- as.double( 7.785205408500864D-02)
Error: unexpected symbol in " c14    <- as.double( 7.785205408500864D"

The above "D" is used in Fortran language to indicate the memory starage mode. That is for instructing Fortran compiler 
to store such a REAL constant in  DOUBLE PRECISION... am I right ?
Since R cannot undestand numerical conatant post-fixed by the letter "D", I wonder how I can instruct R interpreter to 
store such a numerical constant reserving as muh memory as necessary so as to accommodate a double precision number.

I noticed R accepts the folllowing syntax but I do not know if i have achieved my goal thsi way:

>  c14    <- as.double( 7.785205408500864E-02)
> typeof(c4)
[1] "double"

My questions are: what is the best precision I can get with R when dealing with real number ?
Is R "double" type equvalent to Fortran DOUBLE PRECISION  for internal number representation ?

Thank you very much.
Maura








tutti i telefonini TIM!


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