Body of For Loop

You are right, that does not work.  Another way is to use at().

for i from 1 thru 10 do (
(

  specificEquations : at(myEquations, [p=i]),
  print(specificEquations)
);


Of course this is just another way, not necessarily better.  I don?t recommend ev() either BTW.

Rich


From: Stavros Macrakis 
Sent: Thursday, January 06, 2011 5:43 PM
To: Richard Hennessy 
Cc: Michael Knudsen ; maxima at math.utexas.edu 
Subject: Re: [Maxima] Body of For Loop

Richard, 

I doubt that that is what Knudsen wants to do.  Assigning p:i does not substitute i for p in myEquations:

(%i9) myeqs: [x=2*p,y=p^2];
(%o9) [x = 2*p,y = p^2]
(%i10) p:23$
(%i11) myeqs;
(%o11) [x = 2*p,y = p^2]   <<< no substitution performed

            -s


On Thu, Jan 6, 2011 at 17:36, Richard Hennessy <rich.hennessy at verizon.net> wrote:

  You probably want to do. 



  for i from 1 thru 10 do (
  (

    p : i,
    specificEquations : myEquations,
    print(specificEquations)
  );

  In a program the syntax is a little different since commas indicate the end of a statement (in a program).

  Rich


  -----Original Message----- From: Michael Knudsen
  Sent: Thursday, January 06, 2011 2:30 PM
  To: maxima at math.utexas.edu
  Subject: Body of For Loop 


  Hi,

  I have a list of equations called myEquations, and they all depend on
  a single parameter p. Using a command like

  specificEquations : myEquations, p = 1;

  one gets a new list, specificEquations, containing the original
  equations with 1 substituted for the variable p. So far, so good!
  However, if I try to do something similar in a for loop, something
  strange happens.

  for i from 1 thru 10 do (

  (specificEquations : myEquations, p = i),
  print(specificEquations)

  );

  Here all print statements yield the same output, which is just
  myEquations with no value substituted for p.

  What am I missing here? Thanks in advance!

  Michael Knudsen

  -- 
  Michael Knudsen
  micknudsen at gmail.com
  _______________________________________________
  Maxima mailing list
  Maxima at math.utexas.edu
  http://www.math.utexas.edu/mailman/listinfo/maxima 
  _______________________________________________
  Maxima mailing list
  Maxima at math.utexas.edu
  http://www.math.utexas.edu/mailman/listinfo/maxima