Problem 691. Number of bytes required to store a sparse matrix

Created by Aurelien Queffurust

Solve Later

The input will be a sparse matrix :
x = sparse(100,1000,0.01);
    >>whos x 
shows that 8024 bytes ares required .
The aim is to find the the number of bytes required to store a sparse matrix in a 64-bit system without using whos or who commands.

Solve

Solution Stats

74 Solutions
5 Solvers

Last Solution submitted on Jun 24, 2025

Last 200 Solutions

Problem Comments

5 Comments

5 Comments

Show 2 older comments

Richard Zapor on 16 May 2012

Aurelien,
Test Suite case 4 is a Diagonal Sparse matrix which is not a problem defined Sparse matrix and should be replaced by x = sparse(1000,100,0.01);
y_correct = 4016;.
Also, your inventive cheat detect needs to add assert(isempty(strfind(filetext, 'who'))). A re-scoring will see a new leader.
Currently Tests 4 and 5 are always pass as they lack asserts.
Enjoying the challenge.

@bmtran (Bryant Tran) on 17 May 2012

yup, definitely need some asserts

Aurelien Queffurust on 21 May 2012

@Richard, Thanks for your comments. I have added the assert with who and rescored all solutions.

Rafael S.T. Vieira on 26 Aug 2020

All values at the test suite are currently wrong. Using whos in the first case, for instance, we obtain 8024 bytes and not 4016.

Dyuman Joshi on 16 Aug 2021

The values in the test suites have been corrected.

Solution Comments

Show comments

Problem Recent Solvers5

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 691. Number of bytes required to store a sparse matrix

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers5

Suggested Problems

More from this Author30

Problem Tags

Community Treasure Hunt

Problem 691. Number of bytes required to store a sparse matrix

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers5

Suggested Problems

More from this Author30

Problem Tags

Community Treasure Hunt

Players