Problem 44031. Matrix Manipulation

Created by Animesh Patel

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Given an m*n matrix, see if a matrix contains any 0s in any row. if it contains 0 anywhere in any particular row, delete that row and fill that row with random integer values between 3 to 15. For example: mat = [3 2 1 3; 3 0 0 1; 0 4 3 1]; answer = [3 2 1 3; 4 7 5 12; 4 9 10 14]

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Solution Stats

34 Solutions
16 Solvers

Last Solution submitted on Feb 11, 2020

Last 200 Solutions

Problem Comments

1 Comment

1 Comment

goc3 on 25 Jan 2017

The test suite of this problem has been updated to actually check for numbers in the specified range (between 3 to 15), so your random solutions should now work.

Solution Comments

Solution 1110996

4 Comments

4 Comments

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James on 26 Jan 2017

Any chance you could make the test suite see if the numbers are actually random? :-)

David Verrelli on 25 Jun 2018

It's actually quite a difficult thing to do well. See for example Problem 44393 at https://www.mathworks.com/matlabcentral/cody/problems/44393 , which so far has only one solver (in addition to my reference solution). Cf. the Test Suites in Problem 174 by Bryant Tran and Problem 44277 by Amitava Biswas. —DIV

David Verrelli on 25 Jun 2018

(Here it's a little easier because the author can repeatedly call the user's function with the same input, and check for variation in the returned output.)

James on 26 Jun 2018

David, that's kind of what I meant by checking to see if the output was random. Run the code maybe 10-15 times, and see if the values are different each time would be "random enough" for Cody.

Solution 1109528

2 Comments

2 Comments

Shuo Wang on 24 Jan 2017

Should not the output be random?

James on 24 Jan 2017

https://xkcd.com/221/ is another random number generator along these lines. But seriously, yes, the output should be random. The test suite is busted.

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Problem Tags

matrix random