Re: Evaluation Control
- To: mathgroup at smc.vnet.net
- Subject: [mg14864] Re: [mg14858] Evaluation Control
- From: Wagner Truppel <wtruppel at ics.uci.edu>
- Date: Mon, 23 Nov 1998 10:11:46 -0500
- Sender: owner-wri-mathgroup at wolfram.com
Paul,
try Print[ list[[i]] ] instead. Notice the double-bracket set
surrounding i. When you have Print[ list[i] ], list is evaluated to
whatever it is and only then applied as a head to [i]. Since lists
aren't variables, you end up with something like
{0.,.2,.4,.6,.8,1.}[i]. On the other hand, list[[i]] evaluates to the
i-th element of list, which is what you want. The same comments apply
to x=list[i].
Wagner
At 2:17 AM -0500 on 11/20/98, phantomlord at my-dejanews.com wrote:
I am writing a function which involves manipulation of lists, but have
stumbled across a problem. It seems as though when I call
"Print[list[i]]" in a Do[] loop (where i is the iterative variable) it
returns the following: {0.,.2,.4,.6,.8,1.}[i] i.e. it hasn't referenced
the one element I require for computation in the rest of the code.
I try to evaluate a function f[x] at x=list[i], which returns:
Cosh[{0.,.2,.4,.6,.8,1.}[i.]]+....bla bla bla so it seems that it
interprets i as a decimal and NOT an integer, is this the cause of the
problem or is there something else I am doing wrong?
Thanks
Paul
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WAGNER LUIZ TRUPPEL *** ARMS ARE FOR HUGGING ***
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Dept. of Information and Computer Science (949) 856 2192 (home)
University of California, Irvine
Irvine, CA 92697 USA WTRUPPEL at ics.uci.edu
http://www.physics.uci.edu/~wtruppel
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