rounding off numbers
- To: mathgroup at smc.vnet.net
- Subject: [mg23884] rounding off numbers
- From: JikaiRF at aol.com
- Date: Thu, 15 Jun 2000 00:51:21 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Dear members of MathGroup,
I would like to report a problem rounding off numbers with Mathematica.
Take, for example, the number 81.3736. Since I want to round it off to the
second decimal, I use the formula 81.3736 + (9-4)*0.001. And I obtain
Then, if I round off the third decimal point of the above result, 81.3786, I
can obtain the required answer 81.37.
In order to establish the above procedure on Mathematica, I tried the
N[81.3736 +(9-4)*0.001, 4]
However, the result was 81.38, because the function of N is, in this
situation, designed to
the third decimal of 81.3786, that is,8.
I need to round off the third decimal in the above program.
I would like to know how to program Mathematica to achieve this.
I hope to receive useful advice from you, as I have done previously.
P.S. My e-mail address is: JikaiRF at aol.com
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