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Re: exponential format

  • To: mathgroup at smc.vnet.net
  • Subject: [mg114039] Re: exponential format
  • From: Maxim <m.r at inbox.ru>
  • Date: Mon, 22 Nov 2010 07:34:32 -0500 (EST)
  • References: <ic34m8$5jt$1@smc.vnet.net>

On Nov 18, 6:03 am, Magdalena Moczydlowska
<magdamoczydlow... at gmail.com> wrote:
> Hi,
>
> Maybe my question is silly but I can not find any answer in the net ?
> How to change in Mathematica a normal number format to exponential
> notation. I mean for example 0.25->6.25e-02.
>
> Thank you for any suggestion,
> Magdalena

You can play with the options of NumberForm or use the Java format()
method:

NumberForm[0.0625, NumberFormat -> (Row[{#, "e", #3}]&),
 ExponentFunction -> (#&)]

Needs["JLink`"]
sprintf[fs_String, s__] := Module[
  {vararg, n = Length@ {s}},
  InstallJava[];
  LoadJavaClass["java.lang.String"];
  LoadJavaClass["java.lang.reflect.Array"];
  Quiet@ JavaBlock[
    vararg = JavaNew["[Ljava.lang.Object;", n];
    java`lang`reflect`Array`set[
       vararg, # - 1, MakeJavaObject@ {s}[[#]]
     ]& /@ Range@ n;
    java`lang`String`format[fs, vararg]]]

sprintf["%.2e", .0625]

Maxim Rytin
m.r at inbox.ru


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