[Octave-bug-tracker] [bug #32533] Operator precedence for transpose incorrect

[Rik]

Follow-up Comment #5, bug #32533 (project octave):

I wrote a bunch of tests for operator precedence and have found 3 issues to
address.

First, the following:

1) !a++ does not work with the new patch.  Both '!' and '++' are at the same
level of precedence, which usually implies left to right evaluation.  However,
!a is just a number which then can not be incremented by the '++' operator. 
The error message is

error: invalid lvalue function called in expression


2) Exponents, like the assignment operators (=), are supposed to group
right-to-left according to the documentation.  This is not the case for either
the old parser or the parser with the new patch.  Instead exponents are
evaluated left-to-right as any ordinary operator, but contrary to mathematical
notions and the documentation.


2^3^5 = 32768 which is 8^5.
2^(3^5) = 1.4e73


3) Unary minus and the pre-decrement operator do not work together.  This one
is a real corner case and doesn't necessarily need to be fixed, but I thought
I'd mention it.


a = 2;
+--a
ans = 1
---a
error: invalid lvalue function called in expression




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