[pstricks] pstricks-add

[Herbert Voss]

Henning Bredel wrote:

> 9-(x-4)^2  ==> 9 x 4 sub dup mul sub
>                                         ^^^^^^
>                                         does dup only doubles a term, so 
> I have to add the operator mul?
> I have in mind, that dup is for both doubling and multiplying (I didn´t 
> use the PS-reduction in
> mathterms before but I guess I read it somewhere).

dup does as the name duplicate says, nothing else
than putting a copy of the last element on stack.
sqr is a dup with mul. Could be read in _any_ PS manual

Herbert


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