RE: make 1. x 10^-10 read simpl
- To: mathgroup at smc.vnet.net
- Subject: [mg8868] RE: [mg8479] make 1. x 10^-10 read simpl
- From: Ersek_Ted%PAX1A at mr.nawcad.navy.mil
- Date: Tue, 30 Sep 1997 20:16:32 -0400
- Sender: owner-wri-mathgroup at wolfram.com
Rob Peterson wrote:
|
|Seems like I am always losing graph space because the vertical axis is
| labeled like "1. x 10^-10" (except the ^ isn't there). I can't seem to
| find a way to make it take up half the space by showing simply
| "10^-10".
|
I have been working with Rob on his problem. An example of a graphics Rob
is talking about can be made using the following commands.
In[1]:=
h = 6.63*^-34; k = 1.38*^-23; c = 3.0*^8;
c1 = 8*Pi*h*c; c2 = h*c/k;
(* BlackBodyDistr Black Body distr vs T and lambda *)
rho[lambda_, T_] := c1/(lambda^5*(Exp[c2/lambda/T] - 1));
<<Graphics`Graphics`
In[2]:=
LogLogPlot[rho[lambda/10^6, 300], {lambda, 0.5, 100},
PlotRange -> All ];
Out[2]= (* Graphics not shown. *)
The resulting graphic has TickMarks on the vertical axis labeled
1. x 10^-4, 1. x 10^-10, 1. x 10^-16, etc.
Most would rather not have the "1. x" displayed.
I modified the standard package to produce better looking results (in my
opinion).
To do this I changed the definition of the LogTicks command in the
Graphics.m package.
The change I made is shown below. Please let me know If you think the code
should not be changed, or if there is a better way to get the desired
results.
Once Graphics.m is modified as shown below, the commands above will produce
a graphics with TickMarks labeled as 10^-4, 10^-10, 10^-16, etc.
Question:
What is the purpose of NumberForm[x]
in the original code ?
Ted Ersek
_______________________________________
(* The original definition was: *)
LogTicks[x_] :=
{Log[10., x],NumberForm[x]}
(* My new definition is: *)
LogTicks[x_]:=
Module[{xx=MantissaExponent[N[x]], y=Rationalize[x]},
{Log[10. , x],
Which[
xx=={0.1, -1}, 0.01,
xx=={0.1, 0}, 0.1,
xx=={0.1, 1}, 1,
xx=={0.1, 2}, 10,
xx=={0.1, 3}, 100,
Part[xx, 1]==1.0, Superscript[10, Part[xx, 2]],
Part[xx, 1]==0.1, Superscript[10, Part[xx, 2]-1],
IntegerQ[y]&&(y<1000), y,
True, x
]
}
]
________________________________________
Note:
Under Windows 95 the Mma install program put the Graphics.m package in the
following folder:
C/ProgramFiles/WolframResearch/Mathematica/3.0/AddOns/StandardPackages/Graph
ics