Question

I have tried following code for creating sparse graph in MATLAB:

cm = sparse([1 1 2 2 3 3 4 5],[2 3 4 5 4 5 6 6],...
     [2 3 3 1 1 1 2 3],6,6)cm =

but it gives me the following error

???      [2 3 3 1 1 1 2 3],6,6)cm =
                               |
Error: Unexpected MATLAB expression.

I have taken this code from the official site, so I can’t understand why it produces an error.

Answer 1

You shouldn’t write the cm = part at the end. That is, when you write

cm = sparse([1 1 2 2 3 3 4 5],[2 3 4 5 4 5 6 6],...
     [2 3 3 1 1 1 2 3],6,6)

on the command line, you will get

cm =

   (1,2)        2
   (1,3)        3
   (2,4)        3
   (3,4)        1
   (2,5)        1
   (3,5)        1
   (4,6)        2
   (5,6)        3

This is because, you didn’t write a semicolon at the end of the statement. If you don’t want to see the value of cm, just add a semicolon after the closing the parentheses. In addition ... tells to write multi-line statement. You can write

cm = sparse([1 1 2 2 3 3 4 5],[2 3 4 5 4 5 6 6],[2 3 3 1 1 1 2 3],6,6)

alternatively.