On 15 October 2012 22:09, someone <newsbo...@gmail.com> wrote:
>
> See this:
>
> ==============================**============================
> In [5]: Dx = numpy.matrix('1 0 0; 0 0.5 -0.5; 0 -0.5 1.5')
>
> In [6]: Dx
> Out[6]:
> matrix([[ 1. , 0. , 0. ],
> [ 0. , 0.5, -0.5],
> [ 0. , -0.5, 1.5]])
> ==============================**============================
>
<snip>
> Without having to manually change all the individual places using my
> variables (test is actually many variables, not just one but I think you
> should understand the problem now).
>
>
> How to initialize my array directly using variables ?
>
> It could also be that I wanted:
>
> test11 = 1
> test12 = 1.5
> test13 = 2
> test21 = 0
> test22 = 5
>
> Dx = numpy.matrix('test11 test12 test13; test21 test22 -0.5; 0 -0.5 1.5')
>
> Etc... for many variables...
>
> Appreciate ANY help, thank you very much!
Well, I don't know that much on Numpy (I've only ever used the basic
stuff), but Ian Kelly's probably right. If you can't "just use" a list, why
don't you convert it?
def matrixstring2lists(string, lookup_chain):
> stringmatrix = [substr.split() for substr in string.split(";")]
return [
> [
> lookup_chain[item] if item.isidentifier() else eval(item)
> for item in items
> ]
> for items in stringmatrix
> ]
##### TESTS ######
> import builtins
## {{{ http://code.activestate.com/recipes/305268/ (r2)
> class Chainmap(dict):
> """Combine multiple mappings for sequential lookup.
For example, to emulate Python's normal lookup sequence:
> import __builtin__
> pylookup = Chainmap(locals(), globals(), vars(__builtin__))
> """
> def __init__(self, *maps):
> self._maps = maps
> def __getitem__(self, key):
> for mapping in self._maps:
> try:
> return mapping[key]
> except KeyError:
> pass
> raise KeyError(key)
> ## end of http://code.activestate.com/recipes/305268/ }}}
> test11 = 1
> test12 = 1.5
> test13 = 2
> test21 = 0
> test22 = 5
print(matrixstring2lists(
> 'test11 test12 test13; test21 test22 -0.5; 0 -0.5 1.5',
> Chainmap(locals(), globals(), vars(__builtins__))
> ))
That said, calling "matrixstring2lists" requires inputting a mapping from
the local scope, so I don't see how it could get much simpler to call
(minus removing "vars(__builtins__)" unless you *really* want that for some
reason.
--
http://mail.python.org/mailman/listinfo/python-list
