[Solved] 5DV005 Lab4

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Problem 1

  1. Develop a function MySinh which computes the function

You may use the built-in function exp to evaluate ex when |x| is sufficiently large, but you must rewrite f to avoid the subtractive cancellation at when x ≈ 0.

  1. Develop a minimal working example MySinhMWE which compares your implementation to the built-in function sinh. It is possible to reduce the relative error below 10−15 on the interval [−3,3].

Problem 2

  1. Develop a function MyNewtonSqrt which uses Newton’s method for computing square roots subject. Your function must use the initial guess

for s when s ∈ [1,4].

  1. Develop a minimal working example MyNewtonSqrtMWE1 which compares your implementation to the built in function sqrt. It is possible to reduce the relative error to 2u on the interval [10

Problem 3

  1. Develop a function MyLog which uses Newton’s method to solve the non-linear equation f(x) = 0 where f(x) = exp(x) − α and α > Your function must exploit the fact that if α = f · 2e, then

log(α) = log(f) + elog(2)

Your are free to use the special function log2 to determine f and e. You are free to use the built-in value of log(2). Your function must use the initial guess

for log(s) when s ∈ [1,2].

  1. Develop a minimal working example MyLogMWE which compares your implementation to the built-in function log. It is possible to reduce the relative error below 2u on the interval [2,10].

Problem 4

  1. Copy the script scripts/l4p4.m into the function work/MyRobustSecant.m and complete the function according to the specification.
  2. Develop a minimal working example MyRobustSecantMWE which solves the your favorite non-linear equation. I recommend computing a firing solution.

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[Solved] 5DV005 Lab4
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