Re: Printing numbers
- To: mathgroup at smc.vnet.net
- Subject: [mg54515] Re: [mg54483] Printing numbers
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Tue, 22 Feb 2005 04:23:19 -0500 (EST)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
ToString[123.456789] //FullForm
"123.457"
It converted the DisplayForm
StringLength[%]
7
ToString[1234567.89] //FullForm
" 6\n1.23457 10"
Again, it converted the DisplayForm
StringLength[%]
22
numberToString[x_?NumberQ] := Module[
{r=Rationalize[x,0],f},
f=RealDigits[FractionalPart[r]];
StringJoin[ToString[IntegerPart[r]] ,".",
Table["0",{-f[[2]]}],ToString/@f[[1]]]];
numberToString[123.456789]//StringLength
10
numberToString[1234567.89]//StringLength
10
numberToString[1234567.00089]//StringLength
13
In the Help Browser, look up NumberForm and PaddedForm
Bob Hanlon
>
> From: Steve Gray <stevebg at adelphia.net>
To: mathgroup at smc.vnet.net
> Date: 2005/02/21 Mon AM 03:44:51 EST
> To: mathgroup at smc.vnet.net
> Subject: [mg54515] [mg54483] Printing numbers
>
> 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
>
>
>