Discussion: Introducing new operators for matrix computation

[Rainer Deyke]

"Bjorn Pettersen" <bjorn at roguewave.com> wrote in message
news:396FABF3.B82E0C2 at roguewave.com...
>   mylist.foo()  # are you calling the foo method on the list or the
> elements?

A valid point (though not very clearly stated).  Suppose that for all X, .X
is the elementwise operator such that:

a = b .X c

is equivalent to:

a = []
for x in range(len(b)):
  a.append(b[x] X c[x])

What about situations where X is a function instead of an operator?  Should
we allow the following syntax?

a = b..f()

(Equivalent to the following:)

a = []
for x in b:
  a.append(x.f())

Is b..f(c) equivalent to this:

a = []
for x in range(len(b))
  a.append(b[x].f(c[x]))

or is it equivalent to this:

a = []
for x in b:
  a.append(x.f(c))

For that matter, what if X is .+ (or ..+)?  Should we allow this:

a = b ..+ c

as equivalent to this:

a = []
for x in range(len(b))
  a.append(b .+ c)

There has to be a better way to do elementwise operations.


--
Rainer Deyke (root at rainerdeyke.com)
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