Indiana University
University Information Technology Services
What are archived documents?

Login is for authorized groups (e.g., UITS, OVPIT, and TCC) that need access to specialized Knowledge Base documents. Otherwise, simply use the Knowledge Base without logging in.


In MATLAB, how can I sort all of the rows of a matrix according to one of the columns?

The MATLAB function sortrows(A,j) sorts the rows of the matrix a based on the entries of the j-th column. For example, enter the following in MATLAB:

A = [1 2 3 3 0 9 6 5 4] B = sortrows(A,2) C = sortrows(A,3)

You will receive the following output:

B = 3 0 9 1 2 3 6 5 4 C = 1 2 3 6 5 4 3 0 9

Note: By default, the command sortrows(A) (i.e., without the j parameter) sorts by the first column of A, decides ties by the second column, decides further ties by the third column, and so on. For a three-column matrix, sortrows(A) is equivalent to sortrows(A,[1 2 3]).

If you have questions about using statistical and mathematical software at Indiana University, email UITS Research Analytics (formerly known as the Stat/Math Center). Research Analytics is located on the IU Bloomington campus at Woodburn Hall 200, and is open for consultation by appointment Monday-Friday 9am-5pm. For more, visit Research Analytics on the web, or call 812-855-4724 (IUB) or 317-278-4740 (IUPUI).

This is document afrd in domain all.
Last modified on July 08, 2013.

I need help with a computing problem

  • Fill out this form to submit your issue to the UITS Support Center.
  • Please note that you must be affiliated with Indiana University to receive support.
  • All fields are required.

Please provide your IU email address. If you currently have a problem receiving email at your IU account, enter an alternate email address.

I have a comment for the Knowledge Base

  • Fill out this form to submit your comment to the IU Knowledge Base.
  • If you are affiliated with Indiana University and need help with a computing problem, please use the I need help with a computing problem section above, or contact your campus Support Center.