hello
while trying to write a function that processes some numpy arrays and
calculate euclidean distance ,i ended up with this code
(though i used numpy ,i believe my problem has more to do with python
coding style..so am posting it here)
....
# i am using these numpy.ndarrays to do the calculation
facespace # of shape(totalimgs ,imgpixels)
weights # of shape(totalimgs ,selectedfacesp aces)
input_wk # of shape(selectedf acespaces,)
distance # of shape(selectedf acespaces,) initally all 0.0 's
mindistance #of shape(selectedf acespaces,) initally all
0.0 's
....
....
#here is the calculations part
for image in range(numimgs):
distance = abs(input_wk - weights[image, :])
if image==0:
#copy from distance to mindistance
mindistance=dis tance.copy()
if sum(mindistance ) sum(distance):
imgindex=image
mindistance=dis tance.copy()
if max(mindistance ) 0.0:
#normalise mindistance
mindistance=min distance/(max(mindistanc e)+1)
dist=sum(mindis tance)
this gets me the euclidean distance value.I want to know if the way i
coded it can be improved,made more compact....if someone can give
suggestions it will be a great help .
thanks
D
Mar 17 '08
11  6379 
Steven D'Aprano schreef:
On Fri, 28 Mar 2008 16:59:59 +0100, Robert Bossy wrote:
>Gabriel Genellina wrote:
>>That's what I said in another paragraph. "sum of coordinates" is using
a different distance definition; it's the way you measure distance in a
city with square blocks. I don't know if the distance itself has a
name, but
I think it is called Manhattan distance in reference of the walking
distance from one point to another in this city.
You know, there are other cities than Manhattan. Some of them even have
streets and blocks.
I'm not sure what your point is. The name of the distance happens to be
Manhattan distance (or taxicab distance, rectilinear distance, L1
distance, city block distance; see http://en.wikipedia.org/wiki/Manhattan_distance) so Robert has a valid
point.
--
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
-- Isaac Asimov
Roel Schroeven
On Sat, 29 Mar 2008 13:06:27 +0100, Roel Schroeven wrote:
In any case, I replied because your reaction didn't feel all that gentle
to me; to be honest, it felt rather rude.
Are you new to Usenet? :-)
No offense taken; I hope Robert didn't take offense either, but took the
little dig in the spirit it was intended.
--
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