On 10/18/2011 07:32 AM, Panagiotis Papasotiriou wrote:
> The problem is that I need to declare local variables as lists of floats. In
> your example, you define l as a list of floats, but l is a dummy variable,
> not a local variable. Nevertheless, I tried to do something similar in my
> code. To make things simple, declarations look like in the following simple
> example:
>
> f(y):=block([z],mode_declare(z,list),for el in z do
> mode_declare(el,float),z:y);
> translate(f);
> f([1,2,3]);
it's not at all clear to me what you're trying to do here, but perhaps
we can clear up some confusion for you.
in this block of code you first declare a local variable z, then you
declare z to be a list, then you run through each element in the list
but each time you do nothing with the element (other than declare it
which has no effect by itself) but you do set z equal to the input list
multiple times...
also, your input list is NOT a list of floats, it's a list of integers.
mode_declare is a declaration, not a function that has any effect, so
for i in foo do mode_declare(i,float) would not be expected to do
anything really.
I think what you want to do is to take your lists as input, declare a
local array of floats of the appropriate size, and copy the floats out
of the list into your array, then you can do fast arithmetic on the
array in your algorithm.
see info on declared arrays here:
http://maxima.sourceforge.net/docs/manual/en/maxima_5.html
Also, thanks again for working on these numerical algorithms. They will
be much appreciated by maxima users such as myself!