Re: Letting integers be integers (when using //N)
- To: mathgroup at smc.vnet.net
- Subject: [mg27687] Re: Letting integers be integers (when using //N)
- From: drg at uiuc.edu (Daniel R. Grayson)
- Date: Sun, 11 Mar 2001 04:04:30 -0500 (EST)
- Organization: University of Illinois at Urbana-Champaign
- References: <98a14b$cl3@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
"A. E. Siegman" <siegman at stanford.edu> writes:
> A convenient way to format and print the numerical values of a bunch of
> variables a,b,c, . . . neatly aligned directly under their corresponding
> names is
>
> Print[ { {"a", "b", "c", . . . .},
> {a, b, c, . . . . . } //N } //TableForm]
>
> The //N is needed for most of the variables in the list, because most of
> them will otherwise appear as messy expressions with lots of pi's and
> Sqrt[2]'s and such.
>
> The thing is, the variable a has an inherently integer value, and just
> being fussy I'd like it to print as an integer. But if I write the
> second list as
>
> {Round[a], b, c, . . . .}//N
>
> the a value still comes out with a decimal point. Any simple way to
> get rid of the decimal point on that one value, other than putting //N
> on each item of the list individually except for a ?
If you don't mind getting rational numbers out, try this:
In[7]:= ?Rationalize
Rationalize[x] takes Real numbers in x that are close to rationals, and
converts them to exact Rational numbers. Rationalize[x, dx] performs the
conversion whenever the error made is smaller in magnitude than dx.
In[8]:= { 3, Sqrt[2], Pi } // N // Rationalize
Out[8]= {3, 1.41421, 3.14159}