How to have x+y -> x+y and not y+x

• Subject: How to have x+y -> x+y and not y+x
• From: Robert Dodier
• Date: Wed, 18 Jul 2012 18:00:22 +0000 (UTC)

J?rome Laurens <jerome.laurens <at> u-bourgogne.fr> writes:

> entering both x+y and y+x always give y+x as output
> 
> How can I have x+y instead ?
> 
> It seems that maxima is de facto using a reverse alphabetical ordering so
> I tried to use reverse to no avail.

The arguments of all commutative operators and functions are put in a
canonical ordering by Maxima's expression simplifier. 

For most commutative operators, the arguments are displayed in their
canonical ordering. For "+", the display order is controlled by the
global flag powerdisp. When powerdisp = true, the arguments of "+" are
displayed in their canonical ordering. When false (default), they are
displayed in the reverse order.

powerdisp only controls display; the internal order of the arguments is
always the same.

Hope this helps,

Robert Dodier

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