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taylor(-1) displays as +(-1) (low priority) #4062

Open rtoy opened 2 months ago

rtoy commented 2 months ago

Imported from SourceForge on 2024-07-09 11:13:18 Created by macrakis on 2023-10-23 08:45:35 Original: https://sourceforge.net/p/maxima/bugs/4199

taylor(-1,x,0,0) displays as +(-1). It should display as -1. Less annoyingly, taylor(x-1,x,0,1) displays as (-1)+x instead of -1+x.

rtoy commented 2 months ago

Imported from SourceForge on 2024-07-09 11:13:19 Created by rtoy on 2023-10-24 22:03:08 Original: https://sourceforge.net/p/maxima/bugs/4199/#a806

What version? I don't see this with maxima HEAD. It displays -1 + ... and -1 + x + ....

Oh, but if I set display2d:false, I see what you're saying for -1. But for x-1, I see -1+x, which seems ok.

rtoy commented 2 months ago

Imported from SourceForge on 2024-07-09 11:13:23 Created by macrakis on 2023-10-26 09:38:10 Original: https://sourceforge.net/p/maxima/bugs/4199/#a806/d26e

Sorry for not reporting full version and configuration info. Here is a fuller report:

On Maxima 5.46.0 SBCL 2.3.0 MacOS

taylor(-1,x,0,0) => /T/     (- 1) + . . .
taylor(x-1,x,0,1) => /T/    (- 1) + x + . . .

display2d:false$

taylor(-1,x,0,0) => +(-1)
taylor(x-1,x,0,1) => (-1)+x

In none of these cases are the parentheses around -1 needed.

rtoy commented 2 months ago

Imported from SourceForge on 2024-07-09 11:13:27 Created by kjak on 2024-06-20 12:14:35 Original: https://sourceforge.net/p/maxima/bugs/4199/#9217

Using git HEAD it seems that I'm seeing what Ray was seeing:

(%i1) display2d;
(%o1) false

(%i2) taylor(-1,x,0,0);
(%o2) +(-1)

(%i3) taylor(x-1,x,0,1);
(%o3) -1+x

(%i4) display2d : true$

(%i5) taylor(-1,x,0,0);
(%o5)/T/                          - 1 + . . .

(%i6) taylor(x-1,x,0,1);
(%o6)/T/                        - 1 + x + . . .

So out of these it looks like only %o2 has the display issue now.

SBCL and CLISP on Linux.