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Re: Printing numbers
*To*: mathgroup at smc.vnet.net
*Subject*: [mg54536] Re: [mg54483] Printing numbers
*From*: DrBob <drbob at bigfoot.com>
*Date*: Tue, 22 Feb 2005 04:24:20 -0500 (EST)
*References*: <200502210844.DAA27227@smc.vnet.net>
*Reply-to*: drbob at bigfoot.com
*Sender*: owner-wri-mathgroup at wolfram.com
There's no reason to think ToString[123.456789] should have ten characters. In fact, it has seven:
ToString[123.456789]
123.457
That's because the default display for an approximate (machine precision) number is six decimal places. It could have been 1 or 100, after all. By the time the number is given to ToString, Mathematica has stored the number AS a number and forgotten what your InputForm was.
Similarly, ToString turns 1234567.89 into a two-line output taking up 22 characters:
ToString[1.23456789*^6]
" 6\n1.23457 10"
To control display of numbers, experiment with NumberForm, PaddedForm, AccountingForm, etc.
I doubt you'll be very happy with it.
Bobby
On Mon, 21 Feb 2005 03:44:51 -0500 (EST), Steve Gray <stevebg at adelphia.net> wrote:
> 1. Can anyone tell me why these results are what they are? Neither answer is what I would expect,
> which is 10. The two strings are the same length.
>
> Print[StringLength[ToString[123.456789]], " ",
> StringLength[ToString[1234567.89]]];
> 7 22
>
> 2. Is there a simple, easily available or self-evident way to get numbers printed out such that the
> total number of spaces occupied by the print before the decimal point is some fixed, user-specified
> amount, the number of spaces occupied after the decimal point is a different user-specified amount,
> and the number of spaces following the number is a third user-specified amount. The goal is to
> easily produce aligned columns of numerical printing, which would seem to be the most trivial task
> in neat number printing.
> For example if the function is called fprint, fprint[345.678,4,5,6] would print 4 spaces
> followed by 5 character positions to the left of the point (00345 or (2 spaces)" 345", specified by
> another argument), and 6 to its right. So fprint[345.678,4,5,6] would print (4 spaces)(2
> spaces)"345.678"(3 spaces), or if desired (4 spaces)(2 spaces)"345.678000"(no spaces), the total
> taking up 16 positions. Also fprint[-345.678,4,5,6] would print (4 spaces)(1 space)"-345.678"(3
> spaces), also taking 16 positions, with the decimal points aligned with the first example.
> Help is not that helpful, implying that I have to write one or find it somewhere. As I
> recall, C provides an easy way to do this by setting arguments to Print.
> Leads would be appreciated.
>
> Steve Gray
>
>
>
>
>
--
DrBob at bigfoot.com
www.eclecticdreams.net
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