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Is &where a keyword?

Posted on 2008-06-26 03:37 By djc (Maple Rating 1 64)
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I thought before that &where is not  a keyword, but I don't understand the difference here (I found &where in the solutions of pdes):

restart;
f1:=a &where b;
op(2,f1);

it gives me {b}

f2:=a &something b;
op(2,f2);
 

gives me simply b

I don't find any information on &where in the help.

 

 

 

 

 

 

 

 

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acer's picture

pdsolve

Comment on 2008-06-26 09:55 from acer (Maple Rating 4 1377)

The name `&where` is that of a Library routine. You can use showstat() to look at its source.

I believe that it is used by pdsolve, and that it can appear in output as a mechanism for qualifying results. See ?pdsolve and look for references to PDESolStruc .

You may also already know this, but if you create a procedure whose name begins with & then it can be used as an infix operator. So in you example a &where b is pretty much the same as calling `&where`(a,b).

acer

Thanks

Comment on 2008-06-27 02:45 from djc (Maple Rating 1 64)

 

Thanks for your help. 

I have checked the source of `&where` and I 'll check PDESolStruc.

 

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