Problem 44634. Basic matrix operations using standard MATLAB commands

Srishti Saha

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Create the matrix:

 1.0e+15 *

    0.0000    0.0000    0.0000    0.0000    0.0000
    0.0000    0.0000    0.0000    0.0000    0.0000
    0.0001    0.0010    0.0100    0.1000    1.0000

Find the row vector of all column means

Hint: Use logspace to create the matrix. Avoid looking at the test suite before writing a solution

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97 Solutions

56 Solvers

Last Solution submitted on Jan 30, 2026

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1 Comment

David Verrelli on 11 May 2018

This problem needs improvement.
FIRST: the Problem Statement is badly flawed. The starting matrix which is presented appears to contain zero for all entries in the first two rows, although apparently this is not what was intended (according to the Test Suite). SECOND: the Test Suite explicitly contains the solution, and there is only one test case. Asking people not to look is futile. Test Suites should be constructed with multiple cases by generalising the Problem Statement (e.g. allowing different numbers of rows in the starting matrix). See Problem 44616 for further discussion. —DIV

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