Hi, Did you try np.where(res[:,4]==2) ?
Matthieu 2011/3/17 santhu kumar <mesan...@gmail.com> > Hello all, > > I am new to Numpy. I used to program before in matlab and am getting used > to Numpy. > > I have a array like: > res > array([[ 33.35053669, 49.4615004 , 44.27631299, 1. , 2. > ], > [ 32.84263059, 50.24752036, 43.92291659, 1. , 0. > ], > [ 33.68999668, 48.90554673, 43.51746687, 1. , 0. > ], > [ 34.11564931, 49.77487763, 44.83843076, 1. , 0. > ], > [ 32.4641859 , 48.65469145, 45.09300791, 1. , 3. > ], > [ 32.15428526, 49.26922262, 45.92959026, 1. , 0. > ], > [ 31.23860825, 48.21824628, 44.30816331, 1. , 0. > ], > [ 30.71171138, 47.45600573, 44.9282456 , 1. , 0. > ], > [ 30.53843426, 49.07713258, 44.20899822, 1. , 0. > ], > [ 31.54722284, 47.61953925, 42.95235178, 1. , 0. > ], > [ 32.44334635, 48.10500653, 42.51103537, 1. , 0. > ], > [ 31.77269609, 46.53603145, 43.06468455, 1. , 0. > ], > [ 30.1820843 , 47.80819604, 41.77667819, 1. , 0. > ], > [ 30.78652668, 46.82907769, 40.38586451, 1. , 0. > ], > [ 30.05963091, 46.84268609, 39.54583693, 1. , 0. > ], > [ 31.75239177, 47.22768463, 40.00717713, 1. , 0. > ], > [ 30.94617127, 45.76986265, 40.68226643, 1. , 0. > ], > [ 33.20069679, 47.42127403, 45.66738249, 1. , 0. > ], > [ 34.39608116, 47.25481126, 45.4438599 , 1. , 0. > ]]) > > The array is 19X5. > When I do: > nid = (res[:,4]==2).nonzero() > nid tuple turns out to be empty. But the very first row satisfies the > criteria. > > nid = (res[:,4]==3).nonzero(), works out and finds the 5th row. > > Am i doing something wrong? > I basically want to find the rows whose fifth coloumn(4th in numpy matrix > format) is 2. > > Any suggestions? > Thanks > Santhosh > > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion > > -- Information System Engineer, Ph.D. Blog: http://matt.eifelle.com LinkedIn: http://www.linkedin.com/in/matthieubrucher
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