Estimate a using inverse matrix calculation. This is principle of linear regression.
As a friendly reminder, we can see the test suite, so it makes the problem more challenging if the solution is not explicitly in the test suite.
The Test Suite needs to allow for floating-point errors in all test cases, as demonstrated in Solution 1575603. (Refer to Problem 44690.) Also, there should be at least four test cases for every problem.
Swap the first and last columns
Number of 1s in a binary string
find the maximum element of the matrix
Sum the 'edge' values of a matrix
Replace values under a limit
Print true if
Change matrix to vector2
Calculate some equation
Solve the system of linear equations
Replace 0 to NaN!
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