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The sample program named ColMatrixAddSubtract01

The source code for this program is shown in its entirety in Listing 8 .

(The source code is also provided in Listing 14 near the end of the module for convenience.)

Listing 8 . Source code for the program named ColMatrixAddSubtract01.
public class ColMatrixAddSubtract01{ public static void main(String[]args){GM2D03.ColMatrix matrixA = new GM2D03.ColMatrix(3.14,-6.01);GM2D03.ColMatrix matrixB = new GM2D03.ColMatrix(-14.0,-12.2);GM2D03.ColMatrix matrixC = matrixA.add(matrixB);GM2D03.ColMatrix matrixD = matrixC.subtract(matrixA); GM2D03.ColMatrix matrixE = matrixD.subtract(matrixB);System.out.println(matrixC);System.out.println(matrixD); System.out.println(matrixE);}//end main }//end class ColMatrixAddSubtract01

The purpose of this program is to confirm the behavior of the new add and subtract methods of the GM2D03.ColMatrix class.

Source code for the add method of the GM2D03.ColMatrix class

Returning once more to a discussion of the updated GM2D03 library, the source code for this method is shown in Listing 9 . The method adds one ColMatrix object to another ColMatrix object, returning a ColMatrix object. As you should have learned from your studies of the Kjell tutorial, the order in which the two objects are added doesn'tmatter. The result is the same either way.

Listing 9 . Source code for the add method of the GM2D03.ColMatrix class.
public GM2D03.ColMatrix add(GM2D03.ColMatrix matrix){ return new GM2D03.ColMatrix(getData(0)+matrix.getData(0), getData(1)+matrix.getData(1));}//end add

The code in the method is straightforward and shouldn't require an explanation.

Source code for the subtract method of the GM2D03.ColMatrix class

Continuing with the discussion of the updated GM2D03 library, the source code for this method is shown in Listing 10 . This method subtracts one ColMatrix object from another ColMatrix object, returning a ColMatrix object. Also as you should have learned from the Kjell tutorial, in this case, the order of the operation does matter.The object that is received as an incoming parameter is subtracted from the object on which the method is called. Reversing the order of operations producesdifferent results.

Listing 10 . Source code for the subtract method of the GM2D03.ColMatrix class.
public GM2D03.ColMatrix subtract( GM2D03.ColMatrix matrix){return new GM2D03.ColMatrix( getData(0)-matrix.getData(0),getData(1)-matrix.getData(1)); }//end subtract

Once again, the code in the method is straightforward and shouldn't require an explanation.

Program output for program named ColMatrixAddSubtract01

Now, lets get back to the program named ColMatrixAddSubtract01 that is shown in Listing 8 . This program produces the output shown in Figure 3 .

Figure 3 . Screen output from the program named ColMatrixAddSubtract01.
-10.86,-18.21 -14.0,-12.2000000000000010.0,-1.7763568394002505E-15

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Source:  OpenStax, Game 2302 - mathematical applications for game development. OpenStax CNX. Jan 09, 2016 Download for free at https://legacy.cnx.org/content/col11450/1.33
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