Logical operators AND and OR

[joe.belladonna]

Maybe you can try the weird tuple-based ternary:

Code: Select all

(20, 100)[1<2 and 2<3]

Same error.

Maybe it is not possible to use logical operators within FreeCADs Expression, like Willem said.

[fmluizao]

If I'm correct, since the Big Merge it is possible to use any Python command so I would say it depends on which FreeCAD version you're running.

Maybe its not possible to use python in expressions? I did a quick search in the source and find nothing about this

[openBrain]

Maybe it is not possible to use logical operators within FreeCADs Expression, like Willem said.

Maybe its not possible to use python in expressions? I did a quick search in the source and find nothing about this

Yep guys. Probably I mistook. Analyzing the parser file, it looks like boolean operators aren't defined....
Same file at @realthunder fork is more complete and defines said operators. Let's ask :

Ping

@realthunder : is there some merge soon foreseen regarding the expression extension?

[vocx]

If I'm correct, since the Big Merge it is possible to use any Python command...

This is not correct.

Realthunder improved the Expression Engine with the LinkMerge branch, but he did not allow arbitrary Python commands to be used.

See Core-Changes: Expression and Spreadsheet, and PR #2475: Expression syntax extension.

What you are talking about was in fact implemented, but in his own Assembly3 branch. This branch contains many changes and prototype code, but not all of that was included with the LinkMerge. See Expression and Spreadsheet.

[Roy_043]

Workarounds:

AND:
(1 < 2 ? 1 : 0) * (2 < 3 ? 1 : 0) == 1 ? 100 : 20

OR:
(1 < 2 ? 1 : 0) + (2 < 3 ? 1 : 0) >= 1 ? 100 : 20

[realthunder]

@realthunder : is there some merge soon foreseen regarding the expression extension?

No, not in 0.19. Maybe the next version.

Workarounds:

AND:
(1 < 2 ? 1 : 0) * (2 < 3 ? 1 : 0) == 1 ? 100 : 20

OR:
(1 < 2 ? 1 : 0) + (2 < 3 ? 1 : 0) >= 1 ? 100 : 20

I think these are good enough workarounds.

[joe.belladonna]

Workarounds:
AND:
(1 < 2 ? 1 : 0) * (2 < 3 ? 1 : 0) == 1 ? 100 : 20
OR:
(1 < 2 ? 1 : 0) + (2 < 3 ? 1 : 0) >= 1 ? 100 : 20

Thanks a lot. This works perfect.

[app4soft]

Issue on adding logical operators is open on GitHub: https://github.com/FreeCAD/FreeCAD/issues/8008

Workarounds:
AND:
(1 < 2 ? 1 : 0) * (2 < 3 ? 1 : 0) == 1 ? 100 : 20
OR:
(1 < 2 ? 1 : 0) + (2 < 3 ? 1 : 0) >= 1 ? 100 : 20

Thanks a lot. This works perfect.

As for this, there is a way to simplify calculatilon:

• AND:
  = A < B ? (B < C ? 1:0):0
• OR:
  = A > B ? 1:( B < C ? 1:0)
• IF NOT THEN ELSE:
  = A != B ? 1:0(works for both numeric and text string; text should be braketed with << and >>)
• Compare two items size:
  = A != B ? ( A > B ? 1:2):3 (1 - first bigger, 2 - second bigger, 3 - both equal)