       Re: odd mathematica blindspot

• To: mathgroup at smc.vnet.net
• Subject: [mg56484] Re: [mg56468] odd mathematica blindspot
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Tue, 26 Apr 2005 21:52:39 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```\$Version

5.1 for Mac OS X (January 27, 2005)

Off[Solve::ifun];

x/.(Solve[(999999999999/10000000000000)^x\[Equal].5,x]//Flatten)

0.30103

x /. (Solve[(999999999999/10000000000000)^x\[Equal]1/2,x]//Flatten)

Log/Log[10000000000000/999999999999]

%//N

0.30103

Bob Hanlon

>
> From: Edward Peschko <esp5 at pge.com>
To: mathgroup at smc.vnet.net
> Date: 2005/04/26 Tue AM 01:33:53 EDT
> Subject: [mg56484] [mg56468] odd mathematica blindspot
>
> hey all,
>
> I was wondering why the following didn't output any solutions. I'd think
> it would be easy:
>
> 	Solve[(999999999999/10000000000000)^x == .5, x]
>
> It gives no solutions. What's really odd is when you say:
>
> 	Solve[(999/1000)^x==.5, x]
>
> which *does* give solutions, in the form:
>
> 	{{x -> 692.801... }}
>
> Also, just curious, but how do you extract 'x' from the above?
> Say I wanted to plug the above solution into another equation..
> In perl I'd say something like:
>
> y = Solve[(999/1000)^x == .5, x];
>
> 3 * y->{x}  # replaces with 692.81
>
> etc. etc.
>
> but this doesn't seem to work. How do you access parts of a mathematica
> datastructure/hash?
>
> And finally, how do you set values with the tty? ie: suppose my backspace
and
> delete key aren't working with math.exe (they aren't) and I want them to
> delete typos. In unix this would be stty erase ^H. In mathematica...?
>
> Thanks much for any help,
>
> Ed
>
>

```

• Prev by Date: Re: Working with huge text files with mathematica
• Next by Date: Question about Compiling, external functions, and For loops
• Previous by thread: Re: odd mathematica blindspot
• Next by thread: Re: Re: Re: odd mathematica blindspot