[PD] expr update for 0.48

[Shahrokh Yadegari]

Hi Alexandre and All,

I am not sure if the "using store '=' in functions with multiple arguments"
bug has been reported or not. However, in Expr 0.5 which was included in Pd
0.47  an expression which would use the store operator '=" in  a function
with more than one argument such as the following

expr atan2($f1, x = $f2)

expr if ($f1, x = 1, 0)

would pass the creation process but upon execution would throw a "expr:
FUNC_EVAL(766): bad left type 0" error

This is now fixed.

On a related note, if order to make the selective execution of the if()
arguments to work, I had to make a few structural changes in parsing and
execution of expressions. If you are using the new test version that Miller
has put out, please let me know if you see any bugs that I may have
introduced.

cheers,
Shahrokh






On Tue, Jul 18, 2017 at 11:59 AM, Alexandre Torres Porres <porres at gmail.com>
wrote:

> Howdy Shahrokh, Miller and pd-list, the release notes of 0.48 mention this:
>
> "The expr family (expr, expr~, fexpr~) got an update from Shahrokh
> Yadegari. I'm not sure when this first came about, but expr now can access
> "variable" objects as variables inside expressions. Expressions using "if"
> skip evaluating the argument that isn't used."
>
> well, the expr family can access variable objects since version 0.4 (which
> I do not know when got into Pd). As from version 0.5 (which made into Pd by
> 0.47, I think), you could also give it a value by using the new "=" syntax.
> Like: [expr x = 3] changes the value of a [v x] object.
>
> Now we have version 0.55 up, and I do not know what's new about variables,
> maybe nothing? So we could change the notes to what's asctually new. Here's
> a list  Shahrokh sent me though, since I was testing and reporting a few
> bugs.
>
> 2017-07-14 21:08 GMT-03:00 Shahrokh Yadegari <sdy at ucsd.edu>:
>>
>>      - Expr Version 0.55
>>
>>        - The arrays now redraw after a store into one of their members
>>
>>        - The "if()" function is reworked to only evaluate either the
>> left or the right arg      depending on the truth value of the condition.
>>
>>          However, if the condition is a vector,  both the left and the
>> right are evaluated regardless.
>>
>>        - The maximum number of inlet and outlets (MAX_VARS) is now set
>> at 100
>>
>>        - The bug of using store "=" in functions with multiple
>> arguments, which caused an error during execution, is fixed.
>>
> So, Shahrokh, I get all of this but the "bug of using store "=" in
> functions with multiple arguments", I don't think I reported that one,
> would you care to elaborate on it?
>
> Miller, we seem to still have an issue creating [expr] with atanh()
> ,asinh() and acosh() on windows - such as in [expr atanh($f1)]. Are you
> working on it for the final release of Pd 0.48?
>
> Thanks
>



-- 
Shahrokh Yadegari
Professor, Music Department
University of California, San Diego
Director, Sonic Arts R&D and IDEAS
Qualcomm Institute
Email: sdy at ucsd.edu
Web: http://yadegari.org
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