do 4.2.2 and see other functions to solve 4.2.2

do 4.2.2 and see other functions to solve 4.2.2
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4.2.2.曲For each case in Exercise 4.2.1, apply fixed point iteration in MATLAB and use a log-linear graph of the error to verify linear convergence. Then use numerical values of the error to determine an approximate
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