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The least-square method is exact when ____________

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in Computational Fluid Dynamics by (118k points)
The least-square method is exact when ____________

(a) the system is two-dimensional

(b) the system is linear

(c) the system is two-dimensional

(d) the system is quadratic

I had been asked this question in exam.

I want to ask this question from Diffusion Problem topic in chapter Diffusion Problem of Computational Fluid Dynamics

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Best answer
Correct option is (b) the system is linear

Best explanation: Unless the field where we solve the problem is linear, the solution using the least square method will not be exact. This is because the number of columns in the coefficient matrix will be more than the number of rows.

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