[Numpy-discussion] Sine Distribution on a 2D Array

Ian Mallett geometrian@gmail....
Sun Jul 25 02:03:09 CDT 2010


Hi,

After much deliberation, I found a passable solution:

distances = np.abs(np.arange(0,resolution,1)+0.5-(resolution/2.0))
x_gradient = np.tile(distances,(resolution,1))
y_gradient = np.copy(x_gradient)
y_gradient = np.swapaxes(y_gradient,0,1)
distances_to_center = np.hypot(x_gradient,y_gradient)
angles = np.radians(   (distances_to_center/((resolution/2.0)-0.5)) * 90.0
)
lambert_weights = np.cos(angles)

This seems like it could be improved.

Ian

PS, I meant "Sinusoidal" in the title.  I carried that over into my
description, which should have been "cosine", instead of "sine".
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