In finite-element calculations the bilinear function is commonly used for interpolation over a quadrilateral and data is
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In finite-element calculations the bilinear function
is commonly used for interpolation over a quadrilateral and data is always stored in matrix form. If the function fits the data u(0, 0) = u1, u(p, 0) = u2, u(0, q) = u3 and u(p, q) = u4 at the four corners of a rectangle, use matrices to find the coefficients a, b, c and d.
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