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question about entering vectors by the keyboard

  • To: mathgroup at smc.vnet.net
  • Subject: [mg16862] question about entering vectors by the keyboard
  • From: "David P. Johnson" <johnson at ae.msstate.edu>
  • Date: Thu, 1 Apr 1999 21:35:29 -0500
  • Organization: Mississippi State University
  • Sender: owner-wri-mathgroup at wolfram.com

I have a question about entering vectors (1D lists) by keyboard.
Unfortunately, it is difficult to explain in just text, so I have
included a mathematica notebook file below. Any help would be most
appreciated.

(***********************************************************************

                    Mathematica-Compatible Notebook

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MathReader 3.0, or any compatible application. The data for the
notebook 
starts with the line of stars above.

To get the notebook into a Mathematica-compatible application, do one
of 
the following:

* Save the data starting with the line of stars above into a file
  with a name ending in .nb, then open the file inside the application;

* Copy the data starting with the line of stars above to the
  clipboard, then use the Paste menu command inside the application.

Data for notebooks contains only printable 7-bit ASCII and can be
sent directly in email or through ftp in text mode.  Newlines can be
CR, LF or CRLF (Unix, Macintosh or MS-DOS style).

NOTE: If you modify the data for this notebook not in a Mathematica-
compatible application, you must delete the line below containing the 
word CacheID, otherwise Mathematica-compatible applications may try to 
use invalid cache data.

For more information on notebooks and Mathematica-compatible 
applications, contact Wolfram Research:
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Notebook reader applications are available free of charge from 
Wolfram Research.
***********************************************************************)

(*CacheID: 232*)


(*NotebookFileLineBreakTest
NotebookFileLineBreakTest*)
(*NotebookOptionsPosition[      3942,        153]*)
(*NotebookOutlinePosition[      4783,        180]*)
(*  CellTagsIndexPosition[      4739,        176]*)
(*WindowFrame->Normal*)



Notebook[{
Cell["\<\
I use the notebook front end on a Macintosh, although I suspect \
that the syntax is similar on other platforms.\
\>", "Text"],

Cell[TextData[{
  "When I evaluate ",
  "MatrixForm[{2,3,4}]",
  ", I get ",
  Cell[BoxData[
      FormBox[
        RowBox[{"(", GridBox[{
              {"2"},
              {"3"},
              {"4"}
              }], ")"}], TraditionalForm]]],
  "."
}], "Text"],

Cell[CellGroupData[{

Cell[BoxData[
    \(MatrixForm[{2, 3, 4}]\)], "Input"],

Cell[BoxData[
    InterpretationBox[
      RowBox[{"(", GridBox[{
            {"2"},
            {"3"},
            {"4"}
            }], ")"}],
      MatrixForm[ {2, 3, 4}]]], "Output"]
}, Open  ]],

Cell["\<\
I can copy the above output, paste it below as input, and evaluate \
it. I get {2,3,4}.\
\>", "Text"],

Cell[CellGroupData[{

Cell[BoxData[
    InterpretationBox[
      RowBox[{"(", GridBox[{
            {"2"},
            {"3"},
            {"4"}
            }], ")"}],
      MatrixForm[ {2, 3, 4}]]], "Input"],

Cell[BoxData[
    \({2, 3, 4}\)], "Output"]
}, Open  ]],

Cell["This is good so far.", "Text"],

Cell[TextData[{
  "But now, I type \"(  2 \[ControlKey]-\[ReturnKey] 3 \[ControlKey]-\
\[ReturnKey] 4 \[ControlKey]-\[SpaceKey] )\", which looks the same as
before, \
i.e. ",
  Cell[BoxData[
      FormBox[
        RowBox[{"(", GridBox[{
              {"2"},
              {"3"},
              {"4"}
              }], ")"}], TraditionalForm]]],
  ". But when I evaluate it, I get {{2},{3},{4}}, enstead of {2,3,4}."
}], "Text"],

Cell[CellGroupData[{

Cell[BoxData[
    RowBox[{"(", GridBox[{
          {"2"},
          {"3"},
          {"4"}
          }], ")"}]], "Input"],

Cell[BoxData[
    \({{2}, {3}, {4}}\)], "Output"]
}, Open  ]],

Cell["This is bad.", "Text"],

Cell["\<\
I've tried Create Table/Matrix/Palette, with the same result.\
\>", 
  "Text"],

Cell[TextData[{
  "So, is there any way to enter a vector in this format ",
  Cell[BoxData[
      InterpretationBox[
        RowBox[{"(", GridBox[{
              {"2"},
              {"3"},
              {"4"}
              }], ")"}],
        MatrixForm[ {2, 3, 4}]]]],
  " and get {2,3,4} as output, without having to use the Flatten[ ]
command? \
"
}], "Text"]
},
FrontEndVersion->"Macintosh 3.0",
ScreenRectangle->{{0, 1152}, {0, 850}},
WindowSize->{520, 740},
WindowMargins->{{12, Automatic}, {Automatic, 13}},
MacintoshSystemPageSetup->"\<\
00<0001804P000000]P2:?oQon82n at 960dL5:0?l0080001804P000000]P2:001
0000I00000400`<300000BL?00400 at 0000000000000006P801T1T00000000000
00000000000000000000000000000000\>"
]


(***********************************************************************
Cached data follows.  If you edit this Notebook file directly, not using
Mathematica, you must remove the line containing CacheID at the top of 
the file.  The cache data will then be recreated when you save this
file 
from within Mathematica.
***********************************************************************)

(*CellTagsOutline
CellTagsIndex->{}
*)

(*CellTagsIndex
CellTagsIndex->{}
*)

(*NotebookFileOutline
Notebook[{
Cell[1709, 49, 136, 3, 46, "Text"],
Cell[1848, 54, 263, 12, 64, "Text"],

Cell[CellGroupData[{
Cell[2136, 70, 54, 1, 27, "Input"],
Cell[2193, 73, 186, 7, 66, "Output"]
}, Open  ]],
Cell[2394, 83, 111, 3, 30, "Text"],

Cell[CellGroupData[{
Cell[2530, 90, 185, 7, 56, "Input"],
Cell[2718, 99, 43, 1, 26, "Output"]
}, Open  ]],
Cell[2776, 103, 36, 0, 30, "Text"],
Cell[2815, 105, 426, 12, 80, "Text"],

Cell[CellGroupData[{
Cell[3266, 121, 121, 5, 56, "Input"],
Cell[3390, 128, 49, 1, 26, "Output"]
}, Open  ]],
Cell[3454, 132, 28, 0, 30, "Text"],
Cell[3485, 134, 88, 3, 30, "Text"],
Cell[3576, 139, 362, 12, 70, "Text"]
}
]
*)




(***********************************************************************
End of Mathematica Notebook file.
***********************************************************************)

-- 
David
->(Signature continues here)


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