GNU Octave

Time for action – doing addition and subtraction operations

1. I have lost track of the variables! Let us start afresh and clear all variables first:

   octave:66> clear
   

   (Check with whos to see if we cleared everything).

2. Now, we define four variables in a single command line(!)

   octave:67> a = 2; b=[1 2 3]; c=[1; 2; 3]; A=[1 2 3; 4 5 6];
   

   Note that there is an important difference between the variables b and c; namely, b is a row vector, whereas c is a column vector.

3. Let us jump into it and try to add the different variables. This is done using the + character:

   octave:68>a+a
   
   ans = 4
   
   octave:69>a+b
   
   ans =
       3   4   5
   
   octave:70>b+b
   
   ans =
       2   4   6	
   
   octave:71>b+c
   
   error: operator +: nonconformant arguments (op1 is 1x3, op2 is 3x1)
   

   Note

   It is often convenient to enter ...