       Re: Could we build matrix with codition instruction?

• To: mathgroup at smc.vnet.net
• Subject: [mg23331] Re: [mg23314] Could we build matrix with codition instruction?
• From: "Mark Harder" <harderm at ucs.orst.edu>
• Date: Tue, 2 May 2000 00:43:13 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```Coase,    Copy this and try it.
In:=
Needs["LinearAlgebra`MatrixManipulation`"]
In:=
M = UpperDiagonalMatrix[Function[x, 1], 4];
M // MatrixForm

Out//MatrixForm=
\!\(\*
TagBox[
RowBox[{"(", "\[NoBreak]", GridBox[{
{"1", "1", "1", "1"},
{"0", "1", "1", "1"},
{"0", "0", "1", "1"},
{"0", "0", "0", "1"}
}], "\[NoBreak]", ")"}],
(MatrixForm[ #]&)]\)

Look up the documentation for UpperDiagonalMatrix[] and you will see that
the first argument is a function, and it need not be just a constant,
allowing for variable UDM s.
-mark

-----Original Message-----
From: Coase Yang <cnc at ms6.hinet.net>
To: mathgroup at smc.vnet.net
Subject: [mg23331] [mg23314] Could we build matrix with codition instruction?

>Dear All:
>
>I want to construct an 4*4 upper triangular matrix with
>conditional instruction, a[i,j]:
>if j-i>=0, then a[[i,j]]=1
>if j-i<0, then a[[i,j]]=0
>Could anyone tell me how I could build this matrix with
>list or Table form by conditional instruction inside?
>
>Thank you very much.
>
>Coase Yang
>

```

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