[Pyrex] Convert tuple/list in primitive*

[Tom Jenkins]

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Charles Moad wrote:

| On Dec 16, 2004, at 4:52 PM, Lenard Lindstrom wrote:
|>>
|>> cdef extern c_setParam3fv "setParam3fv"(int param, float *value)
|>>
|>> def setParam3fv(param, value):
|>>    cdef float args[3]
|>>    cdef int i
|>>
|>>    i = 0
|>>    for val in value:
|>>       args[i] = val
|>>    c_setParam3fv(param, args)
|>>
|>> This works fine and all, but I don't think this is my preferred way
|>> given a large list of floats since the python looping contruct is slow.
|>>
|
| I found the PySequence_Fast method along with related access functions,
| but I have been unable to make it work in pyrex.  Is there a example of
| this out there anywhere that uses the better "for i from 0 <= i < n"
| construct?
|

I've successfully used the "for i from 0..." to do something similar to
what the OP wants to do.

in my case i have a structure that has int (partnum) and float (dval)
arrays.  this works

...
(cnt is figured out beforehand, _partnum and _dval are python lists)
...
~    for i from 0 <= i <= cnt:
~      params.partnum[i] = _partnum[i]
~      params.dval[i] = _dval[i]

works fine

- --
Tom Jenkins
DevIS - Development Infostructure
http://www.devis.com

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