eg2

(* Content-type: application/vnd.wolfram.mathematica *)

(*** Wolfram Notebook File ***)
(* http://www.wolfram.com/nb *)

(* CreatedBy='Mathematica 8.0' *)

(*CacheID: 234*)
(* Internal cache information:
NotebookFileLineBreakTest
NotebookFileLineBreakTest
NotebookDataPosition[       157,          7]
NotebookDataLength[      3070,         82]
NotebookOptionsPosition[      2747,         65]
NotebookOutlinePosition[      3101,         81]
CellTagsIndexPosition[      3058,         78]
WindowFrame->Normal*)

(* Beginning of Notebook Content *)
Notebook[{

Cell[CellGroupData[{
Cell["functions", "Section",
 CellChangeTimes->{{3.525542878650548*^9, 3.525542880416729*^9}}],

Cell["\<\


Clear[getpos];
getpos[element_String] :=
  Module[{goodpos, val, k = Position[vars, element][[1,1]]},
     good =  Flatten[Position[data, _?((Abs[#[[k]]] > 10^-4)&), {1}]];
     Array[(val = data[[good[[#]],k]]; If[val < 0, data[[good[[#]],k]] = \
-val/2])&, Length[good] ];
     {k, good}]

(* goodpos from 'data' *)

\
\>", "Input",
 CellChangeTimes->{{3.536807353579389*^9, 3.536807366004743*^9}, {
   3.5368075257040854`*^9, 3.5368075365711107`*^9}, {3.5368075905904207`*^9,
   3.536807603851081*^9}, {3.5368076695852537`*^9, 3.536807670155402*^9}, {
   3.5368077084972143`*^9, 3.5368077264154882`*^9}, 3.5368078060379066`*^9, {
   3.53680785859536*^9, 3.536807868419298*^9}, {3.5368081049732656`*^9,
   3.536808244619398*^9}, {3.5368082756393957`*^9, 3.536808434603407*^9}, {
   3.536808473526009*^9, 3.536808476628237*^9}, {3.536808538685506*^9,
   3.536808542483759*^9}, {3.536808906243566*^9, 3.536808962619392*^9}, {
   3.5368099502054367`*^9, 3.536810010486621*^9}, 3.536810159050418*^9, {
   3.536810189133416*^9, 3.536810484355564*^9}, {3.5368108056318913`*^9,
   3.536810815483436*^9}, {3.5368108563894672`*^9, 3.536810887541497*^9}, {
   3.536810938937948*^9, 3.536811007746114*^9}, 3.5368120422730513`*^9, {
   3.536816734635078*^9, 3.536816764495511*^9}, {3.536817205022016*^9,
   3.5368172718624496`*^9}, {3.53681758429191*^9, 3.5368175845152807`*^9}, {
   3.551205323937608*^9, 3.5512053516434*^9}, {3.552789865373589*^9,
   3.552789884220105*^9}, {3.552859591216968*^9, 3.552859601409501*^9}, {
   3.552859666075337*^9, 3.552859688200486*^9}, {3.552865291934667*^9,
   3.5528652998012*^9}, {3.552865368420989*^9, 3.552865376361524*^9}, {
   3.552865408982329*^9, 3.5528654116231833`*^9}, {3.552865446054214*^9,
   3.552865457377349*^9}, {3.5528655097334137`*^9, 3.552865522895688*^9}, {
   3.552865694133601*^9, 3.552865809620863*^9}, 3.5707790512968493`*^9, {
   3.570781056632057*^9, 3.570781065779727*^9}, {3.5707839119561443`*^9,
   3.57078391905689*^9}, {3.570783950408087*^9, 3.5707839820464973`*^9}}]
}, Open  ]]
},
WindowSize->{1132, 999},
WindowMargins->{{4, Automatic}, {Automatic, 4}},
FrontEndVersion->"8.0 for Mac OS X x86 (32-bit, 64-bit Kernel) (October 5, \
2011)",
StyleDefinitions->"Default.nb"
]
(* End of Notebook Content *)

(* Internal cache information *)
(*CellTagsOutline
CellTagsIndex->{}
*)
(*CellTagsIndex
CellTagsIndex->{}
*)
(*NotebookFileOutline
Notebook[{
Cell[CellGroupData[{
Cell[579, 22, 94, 1, 67, "Section"],
Cell[676, 25, 2055, 37, 170, "Input"]
}, Open  ]]
}
]
*)

(* End of internal cache information *)