Mr. Chandru,
        The R stands for real. The number following specify the number of words
used to store the numeric value. I am not sure you can use just R by itself
as the definition of reals on HP are either 2 or 4 words. As for the values
they both hold the same max value. Approximately 1 E308, but the difference
is in the accuracy of the number. The R2 only has 6 to 7 digit accuracy and
the R4 has 15 to 16 digit accuracy. As to the source of this information,
any of the old HP MPE books which discuss storage will describe the internal
storage of these values.
        HP switched to the more used standard of storing reals when it switched the
architecture of it CPU's to PA-RISC which use natively the IEEE standard,
but they still emulate the old values also.

        James

-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]]On
Behalf Of Jay Chandru
Sent: Monday, February 18, 2002 3:15 AM
To: [log in to unmask]
Subject: [HP3000-L] Data Type - R, R2 and R4


Hi All,
Turbo Image Datatye Question.
Below are various data types of data items in an Image dataset.

Ex:
FO DATASETNAME
      Qty1   R2
      Numb   R
      Amnt   R4
      Prod   X(4)

What does R stand for and what is the maximum value that i can represent
using R2,R and R4.

Questions:
1) Max. value of Qty1
2) Max. value of Numb
3) Max. value of Amnt


Also Pls. point me to the doc where i can get the difference between R,
R2 and R4.

Thanks in advance,
-Jay


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