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Update mg.jl #5

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Update mg.jl #5

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16 changes: 8 additions & 8 deletions 17_Poisson_Solver_Multigrid/mg.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -36,24 +36,24 @@ function restriction(nxf, nyf, nxc, nyc, r, ec)
# NE, NW, SE, SW with respect to coarse grid point in fine grid
corner = 1.0*(r[2*i-1+1, 2*j-1+1] + r[2*i-1+1, 2*j-1-1] +
r[2*i-1-1, 2*j-1+1] + r[2*i-1-1, 2*j-1-1])
# restriction using trapezoidal rule
# restriction using the trapezoidal rule
ec[i,j] = (center + grid + corner)/16.0
end end

# restriction for boundary points bottom and top
for j = 1:nxc+1
for j = 1:nyc+1
# bottom boundary i = 1
ec[1,j] = r[1, 2*j-1]
# top boundary i = ny_coarse+1
ec[nyc+1,j] = r[nyf+1, 2*j-1]
# top boundary i = nx_coarse+1
ec[nxc+1,j] = r[nxf+1, 2*j-1]
end

# restriction for boundary poinys left and right
for i = 1:nyc+1
# restriction for boundary points left and right
for i = 1:nxc+1
# left boundary j = 1
ec[i,1] = r[2*i-1,1]
# right boundary nx_coarse+1
ec[i,nxc+1] = r[2*i-1, nyf+1]
# right boundary j = ny_coarse+1
ec[i,nyc+1] = r[2*i-1, nyf+1]
end
end

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