It's probably worth noting that there are a lot of different rules for interpreting symbolic notation. (The meanings of those symbols can vary widely, depending on context.)
For example, compare the notation on these pages with whatever you are working with: http://en.wikipedia.org/wiki/Laplace_operator http://en.wikipedia.org/wiki/Semigroup_with_involution http://en.wikipedia.org/wiki/Composition_of_relations http://en.wikipedia.org/wiki/Hadamard_product_(matrices) http://en.wikipedia.org/wiki/Gram_matrix http://en.wikipedia.org/wiki/Sesquilinear_form http://en.wikipedia.org/wiki/Maxwell%E2%80%93Stefan_diffusion That said, this might interest you: http://rosettacode.org/wiki/Arithmetic_evaluation#J Thanks, -- Raul On Thu, Aug 1, 2013 at 12:40 PM, EelVex <[email protected]> wrote: > Hi bob, > that's the problem (I think I was not clear): I want to read the output > from another program that makes symbolic calculations and I don't want to > have to read huge expressions just to parenthesise them correctly. > > > On Thu, Aug 1, 2013 at 7:31 PM, bob therriault <[email protected] > >wrote: > > > Hi Eelvex, > > > > I think that the monadic primitive Do (".) may be the answer, although > you > > would need to use parenthesis to get the order of execution that you > would > > like. > > > > a=.2 > > b=.3 > > ".'a*b+b*a' > > 18 > > ".'(a*b)+b*a' > > 12 > > > > Cheers, bob > > > > On 2013-08-01, at 9:22 AM, EelVex wrote: > > > > > Is there a verb in the library to read "paper math" into J expressions? > > > > > > Eg. > > > a =: 2 > > > b =: 3 > > > read 'a * b + b * a' > > > 12 > > > ---------------------------------------------------------------------- > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
