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[MUG] Re: Variables in an array
| [MUG] Re: Variables in an array |
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Author: Maple Group
Posted: 31/03/2000 15:10:42 GDT
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>> From: Maple Group
On Tue, 28 Mar 2000, Jonathan Dentch wrote:
|> I need to create an array of values. However, Maple
|> won't store the values when I use the variable q[].
|>
C:=array(1..11,1..1,[[500.],[q[1]],[q[2]],[q[3]],[q[4]],[q[5]],[q[6]],[q[7]],[q[
8]],[q[9]],[123.23]]);
|> > q:=seq(100./(360*i*0.25),i=1..9);
|> I wish C to be all numerics, not variables. Please
|> advise.
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Date: Wed, 29 Mar 2000 14:34:18 -0500 (EST)
From: Edwin Clark
To: Jonathan Dentch
Subject: Variables in an array
Try this, which, by the way, is an easier way to
set up the matrix:
restart:
> with(linalg):Warning, new definition for norm
Warning, new definition for trace
> C:=transpose(matrix([[500.,seq(q[i],i=1..9),123.23]]));
Now you want to substitute certain values for
the variables q[i]. This can be done thusly:
qvalues:=seq(100./(360*i*0.25),i=1..9);
> subs(seq(q[i]=qvalues[i],i=1..9){},eval(C));
------------------------------------------------------
W. Edwin Clark
Department of Mathematics, University of South Florida,
4202 East Fowler Avenue, PHY 114, Tampa, FL 33620-5700
http://www.math.usf.edu/~eclark/
------------------------------------------------------
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Date: Wed, 29 Mar 2000 14:55:06 -0800 (PST)
From: Robert Israel
To: Maple Users Group
Subject: Variables in an array
Try this (after assigning C and q as above):
> C:= map(eval,C);
Robert Israel
Department of Mathematics http://www.math.ubc.ca/~israel
University of British Columbia
Vancouver, BC, Canada V6T 1Z2
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Date: Thu, 30 Mar 2000 10:54:40 +0200
From: Preben Alsholm
To:
Subject: Variables in an array
The following should do it:
C1:=map(eval,C);
Preben Alsholm
Technical University of Denmark
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Date: Thu, 30 Mar 2000 12:04:45 +0200
From: Barsuhn
Subject: Variables in an array
To:
Dear Jonathan,
assignments outside an array, table or matrix do not directly cause
alterations inside these data structures. By redefining your array C via
C:=map(eval,C);
your values of the q[i] have entered C, as you may see by the
statements
print(C); or eval(C);
All the best Jurgen
--
-------------------
Prof. Dr. Jurgen Barsuhn
Fachhochschule Bielefeld
University of Applied Sciences
Fachbereich Elektrotechnik und Informationstechnik
D-33511 Bielefeld
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Date: Thu, 30 Mar 2000 13:26:01 +0200
From: Adri van der Meer
To:
Subject: Variables in an array
This is an instance of the "last name evaluation" in
arrays and tables. You can force the evaluation of the
elements of C to values by:
> C := map(eval,C):
--
A. van der Meer
Dept. Applied Mathematics
University of Twente Phone +31 (53) 4893427
P.O. Box 217 Fax +31 (53) 4894824
7500 AE Enschede
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Date: Thu, 30 Mar 2000 09:58:02 -0500
From: Gyrya Pavel
To:
Subject: Variables in an array
Use
> q:=[seq(100./(360*i*0.25),i=1..9)];
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