1. Downloading matrices from the Matrix Market The Matrix Market is an interesting collection of matrices from a variety of applications

2. Purpose of this tutorial To describe how to download matrices from the Matrix Market and how to uncompress the Matrix Market files

3. Steps in downloading matrices 1.Find the desired matrix in the Matrix Market (see “Introduction to the Matrix Market”) 2.Download a file describing the matrix 3.Uncompress the file 4.Convert the matrix to Matlab format (see “Converting Matrix Market matrices to Matlab format”)

4. Downloading a file describing the matrix After finding the desired matrix in the Matrix Market, scroll down to “Download as” and double click on the name of the matrix in Matrix Market format

6. Options to uncompress the file 1.Your browser automatically uncompresses the file 2.Your browser asks you to open a helper utility that uncompresses the file 3.Save the file directly to your disk and a. Use a helper to uncompress the file or b. Uncompress it in DOS with gzip.exe

7. 1. Your browser may automatically uncompress your file

9. 2. Your browser make ask you to open a helper utility

10. Some common helper utilities for uncompressing files are Winzip PowerDesk WinRar We will illustrate the use of Winzip and PowerDesk

13. If the above commands do not work (skip the rest of this tutorial if the above commands work on your computer) 3. You should save the uncompressed file directly to your disk You can do this by clicking the right mouse button on the file name in the Matrix Market

16. This will allow you to save the uncompressed file in the folder of your choice If use “my computer” to move to the folder and double click on the file a help utility may open If none of the above works you can use a DOS program, gzip.exe, to uncompress your file

17. 1. Download the program gzip.exe from www.math.sjsu.edu/~foster to the same folder that containing your other files

20. 2. Open up DOS by selecting “start, run” and typing cmd 3. Move to the proper folder using cd 4. Shorten the file name to 8 or fewer letters 5. Run the gzip.exe program

24. Other tutorials available at www.math.sjsu.edu/~foster Introduction to the Matrix Market Converting Matrix Market matrices to Matlab format Using Matrix Market matrices in Matlab Iterative methods in Matlab with Matrix Market matrices