mirror of
https://github.com/wassname/simpeg.git
synced 2026-06-28 23:58:09 +08:00
Dave Marchant
77 lines
2.4 KiB
Python
77 lines
2.4 KiB
Python
import numpy as np
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import scipy.sparse as sp
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from sputils import spzeros
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from matutils import mkvc, sub2ind
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def interpmat(x,y,z,xr,yr,zr):
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""" Local interpolation computed for each receiver point in turn """
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nx = max(x.shape)
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ny = max(y.shape)
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nz = max(z.shape)
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npts = max(xr.shape)
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Q = sp.lil_matrix((npts, nx*ny*nz))
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for i in range(npts):
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# in x-direction
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im = np.argmin(abs(x-xr[i]))
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if xr[i] - x[im] >= 0: # Point on the left
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ind_x1 = im
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ind_x2 = im+1
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elif xr[i] - x[im] < 0: # Point on the right
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ind_x1 = im-1
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ind_x2 = im
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dx1 = xr[i] - x[ind_x1]
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dx2 = x[ind_x2] - xr[i]
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# in y-direction
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im = np.argmin(abs(y-yr[i]))
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if yr[i] - y[im] >= 0: # Point on the left
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ind_y1 = im
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ind_y2 = im+1
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elif yr[i] - y[im] < 0: # Point on the right
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ind_y1 = im-1
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ind_y2 = im
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dy1 = yr[i] - y[ind_y1]
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dy2 = y[ind_y2] - yr[i]
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# in z-direction
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im = np.argmin(abs(z-zr[i]))
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if zr[i] - z[im] >= 0: # Point on the left
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ind_z1 = im
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ind_z2 = im+1
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elif zr[i] - z[im] < 0: # Point on the right
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ind_z1 = im-1
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ind_z2 = im
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dz1 = zr[i] - z[ind_z1]
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dz2 = z[ind_z2] - zr[i]
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dv = (x[ind_x2] - x[ind_x1]) * (y[ind_y2] - y[ind_y1]) *(z[ind_z2] - z[ind_z1])
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Dx = x[ind_x2] - x[ind_x1]
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Dy = y[ind_y2] - y[ind_y1]
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Dz = z[ind_z2] - z[ind_z1]
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# Get the row in the matrix
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inds = sub2ind((nx,ny,nz),[
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( ind_x1, ind_y2, ind_z1),
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( ind_x1, ind_y1, ind_z1),
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( ind_x2, ind_y1, ind_z1),
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( ind_x2, ind_y2, ind_z1),
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( ind_x1, ind_y1, ind_z2),
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( ind_x1, ind_y2, ind_z2),
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( ind_x2, ind_y1, ind_z2),
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( ind_x2, ind_y2, ind_z2)])
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vals = [(1-dx1/Dx)*(1-dy2/Dy)*(1-dz1/Dz),
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(1-dx1/Dx)*(1-dy1/Dy)*(1-dz1/Dz),
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(1-dx2/Dx)*(1-dy1/Dy)*(1-dz1/Dz),
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(1-dx2/Dx)*(1-dy2/Dy)*(1-dz1/Dz),
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(1-dx1/Dx)*(1-dy1/Dy)*(1-dz2/Dz),
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(1-dx1/Dx)*(1-dy2/Dy)*(1-dz2/Dz),
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(1-dx2/Dx)*(1-dy1/Dy)*(1-dz2/Dz),
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(1-dx2/Dx)*(1-dy2/Dy)*(1-dz2/Dz)]
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Q[i, mkvc(inds)] = vals
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Q = Q.tocsr()
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return Q |