Am 25.07.10 06:38, schrieb Ian Mallett: > Hi, > > So I have a square 2D array, and I want to fill the array with sine > values. The values need to be generated by their coordinates within the > array. > > The center of the array should be treated as the angle 90 degrees. Each > of the four edges should be 0 degrees. The corners, therefore, ought to > be -sqrt(2)*90 degrees. The angle is equal to > (distance_from_center/(dimension_of_array/2))*90 degrees. Then take the > sine of this angle. > > To describe another way, if the array is treated like a height-field, a > single mound of the sine wave should just fit inside the array. > > Right now, I'm having trouble because I don't know how to operate on an > array's values based on the index of the values themselves.
Something like that? The mgrid thing returns two 2D arrays containing the x- and y-coordinates which are then used to calculate the height field. In [5]: import numpy as N In [6]: x,y = N.mgrid[-N.pi/2.0:N.pi/2.0:100j,-N.pi/2.0:N.pi/2.0:100j] In [7]: z = N.sin(N.sqrt(x**2+y**2)) Christian _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
