[Date Index]
[Thread Index]
[Author Index]
Re: How to plot a date file? Some questions, some solutions.
*To*: mathgroup at smc.vnet.net
*Subject*: [mg4854] Re: How to plot a date file? Some questions, some solutions.
*From*: vvs124 at rsphy1.anu.edu.au (Victoria Steblina)
*Date*: Thu, 26 Sep 1996 22:42:15 -0400
*Organization*: Australian National University
*Sender*: owner-wri-mathgroup at wolfram.com
lbliao <lbliao at alumni.caltech.edu> wrote:
>The following is a file that I want to plot
>as either R versus FQ or DG versus FQ.
>Note it has three columns of numbers preceeded
>by two letter identifiers R_, DG, FQ, where
>R_ is a two letter identifier. _ denotes
>white space.
>
>
>R 999.1E-3,DG 000.0E+0,FQ 1.000E+3
>R 999.1E-3,DG 000.0E+0,FQ 1.023E+3
>R 999.1E-3,DG 000.0E+0,FQ 1.047E+3
>R 999.1E-3,DG 000.0E+0,FQ 1.072E+3
>R 999.1E-3,DG 000.0E+0,FQ 1.096E+3
>R 999.1E-3,DG 000.0E+0,FQ 1.122E+3
>R 999.1E-3,DG 000.0E+0,FQ 1.148E+3
>R 999.1E-3,DG 000.0E+0,FQ 1.175E+3
>R 999.1E-3,DG 000.0E+0,FQ 1.202E+3
>R 999.1E-3,DG 000.0E+0,FQ 1.230E+3
>R 998.9E-3,DG 000.0E+0,FQ 7.244E+3
>R 998.9E-3,DG 000.0E+0,FQ 7.413E+3
>R 999.0E-3,DG 000.0E+0,FQ 7.585E+3
>R 998.9E-3,DG 000.0E+0,FQ 7.762E+3
>R 998.9E-3,DG 000.0E+0,FQ 7.943E+3
>R 998.9E-3,DG 000.0E+0,FQ 8.128E+3
>R 999.0E-3,DG 000.0E+0,FQ 8.317E+3
>R 999.0E-3,DG 000.0E+0,FQ 8.511E+3
>R 999.0E-3,DG 000.0E+0,FQ 8.709E+3
>R 999.0E-3,DG 000.0E+0,FQ 8.912E+3
>R 999.0E-3,DG 000.0E+0,FQ 9.120E+3
>R 999.0E-3,DG 000.0E+0,FQ 9.332E+3
>R 998.8E-3,DG-000.0E+0,FQ 9.999E+3
>R 998.8E-3,DG-000.0E+0,FQ 10.00E+3
--- skip ---
>The first problem is to separate the list into three columns
>a=ReadList["c:\\file", Word,
>WordSeparators -> {"R", ",DG", ",FQ"},
>RecordLists->True]
>
>For RecordList -> True, see page 182,
>For WordSeparators -> {}, see p 496,
>
>This has one PROBLEM. Although all the three number fields are separated,
>they are not numbers any more, but words.
>
>The second problem is to get any two columns from the three columns so that
>they can be plotted I do not see how to directly get two columns other than
> transposing getting the rows, and then transposing back again, ie
>
>Transpose[Transpose[a][[{1,3}]]]
Try this:
a=ReadList["data", Word,
WordSeparators -> {"R", ",DG", ",FQ"},
RecordLists->True]//ToString; (* Make it a string for further
replacements*)
That will convert all "exponential" notations into Mma number format
(unless I misread something, this is what you want) and then convert
string
"a" to the list of symbols:
toSymbols = StringReplace[a, {"E" -> " 10^"}] // ToExpression;
Build up lists for R, DG, and FQ respectively:
Rlist = First /@ toSymbols // Flatten
DGlist = Transpose[{Transpose[toSymbols][[2]]}] // Flatten
FQlist = Last /@ toSymbols // Flatten
(local) Out[79]=
{0.9991, 0.9991, 0.9991, 0.9991, 0.9991, 0.9991, 0.9991, 0.9991,
0.9991, 0.9991, 0.9989, 0.9989, 0.999, 0.9989, 0.9989, 0.9989,
0.999, 0.999, 0.999, 0.999, 0.999, 0.999, 0.9988, 0.9988}
(local) Out[80]=
{0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
0., 0., 0., 0., 0., 0., 0.}
(local) Out[81]=
{1000., 1023., 1047., 1072., 1096., 1122., 1148., 1175., 1202., 1230.,
7244., 7413., 7585., 7762., 7943., 8128., 8317., 8511.,
8709., 8912., 9120., 9332., 9999., 10000.}
Transpose two lists (will produce 2 tables of values: R vs FQ and DG
vs FQ)
and ListPlot them:
RvsFQ = ListPlot @ Transpose[{FQlist, Rlist}];
DGvsFQ = ListPlot @ Transpose[{FQlist, DGlist}];
Hope it helps a bit.
Victoria
_______________________________________________________________
Victoria Steblina
vvs124 at rsphy1.anu.edu.au
Optical Sciences Centre
Australian National University
==== [MESSAGE SEPARATOR] ====
Prev by Date:
**Re: How to plot a date file? Some questions, some solutions.**
Next by Date:
**Problems running Mathematica 2.2.3 under Windows95**
Previous by thread:
**Re: How to plot a date file? Some questions, some solutions.**
Next by thread:
**How to plot a date file? Some questions, some solutions.**
| |