Underscores not converted to subscripts

[m-weirich]

wxMaxima 21.x doesn't convert underscores to subscripts properly. In the below example t_ONmax and t_OFFmax should be displayed with subscript.

Couldn't detect a scheme so far, which underscores are converted to subscript and which ones not.
Older versions like 17.05.0 displays the same formula (and of course all others as well) correctly:

wxMaxima version: 21.02.0_MSW
using wxWidgets version: wxWidgets 3.1.4
Maxima version: 5.45.1
Maxima build date: 2021-06-21 17:43:28
Host type: x86_64-w64-mingw32
System type: Win32 6.2.9200 X86-64
Lisp implementation type: SBCL
Lisp implementation version: 2.0.0

[daute]

Strange, can't reproduce it here - neither on Linux (21.02.0 and current development version) nor on Windows (21.02.0, included in the latest Maxima release).
There are options to prevent variables to be not/always be subscripted - these are not set (maybe automatically as startup commands. so not explicitly set in the current worksheet)?

[m-weirich]

Definitely no options set. And I loaded exactly the same file into 21.x and 17.x, where it works as expected.
It becomes even more strange when you look at the example below:

If I change P_OUT to P_oUT, subscript works as it should:

Other changes work as well:

I tried many more. Seems there is something special about 'OUT'.
When you examine the XML output of Maxima (Raw XML Monitor) you'll find that P_OUT creates a different XML code than for example P_OUT1.

[gcem]

Does this happen if you write the command right at the beginning of a new session?

[daute]

wxMaxima version: 21.02.0_MSW
using wxWidgets version: wxWidgets 3.1.4
Maxima version: 5.45.1
Maxima build date: 2021-06-21 17:43:28

Concerning the version number - in the precompiled installer, I made (and I am pretty sure, that one was used, the build date and time is exactly the same as in that installer), included is not wxMaxima 21.02.0 but 21.05.2:
wxMaxima version: 21.05.2_MSW
Maybe a typo? Am I right? Or did you use an older wxMaxima version, not the included one?

And - as gcem wrote (I assume the error is not reproducible too) - maybe you can construct a minimal (problematic) example and attach it to the bug report.
Best regards, Wolfgang

[gunterkoenigsmann]

What is the value of the maxima variable wxsubscripts? And what does the XML monitor (double-click on the network symbol in the bottom right) show if somethin isn't auto-subscripted that should?

[m-weirich]

Does this happen if you write the command right at the beginning of a new session?
No, it doesn't happen if it's the very first command.

I found that the issue occurs only and only affects varaiables that have been assigned before.
For example if P_OUT is defined as below and then used in a subsequent equation, there will be no subscript:

With the above example it should be possible to reproduce the issue.
And again, exactly the same sequence of expressions works absolutely fine in older version:

Finally: 21.02.0 is correct, maybe a relic of older Maxima version. I nevertheless confirmed the issue on two other computers with 21.05.2 as well.

[gunterkoenigsmann]

Gaaah! That looks like we'll need a lisp wizard: The autosubscript code is part of wxmathml.lisp.

[robert-dodier]

Problem reported here is fixed by same patch as submitted for #1807 . I'll leave this open until someone can build a new version, then we should come back to this one and close it.

[robert-dodier]

I pushed commit [ a22f5a3 ] which fixes the problem described here.