$/**$

$*$ create a MathMatrix of the specified size with all cells set to the intialValue.

$*$ pre: numRows $>0,$ numCols $>0$

$*$ post: create a matrix with numRows rows and numCols columns.

$*$ All elements of this matrix equal initialVal.

$*$ In other words after this method has been called getVal$($r$,$c$)=$ initialVal

$*$ for all valid r and c$.$

$*$ @param numRows numRows $>0$

$*$ @param numCols numCols $>0$

$*$ @param initialVal all cells of this Matrix are set to initialVal

$*/$

public int$[][]$ MathMatrix$($int numRows, int numCols, int initialVal$)\{$

return null;

$\}$

$/**$

$*$ get the value of a cell in this MathMatrix.

$*$ pre: row $0<=$ row $<$ getNumRows$(),$ col $0<=$ col $<$ getNumColumns$()$

$*$ @param row $0<=$ row $<$ getNumRows$()$

$*$ @param col $0<=$ col $<$ getNumColumns$()$

$*$ @return the value at the specified position

$*/$

public int getVal$($int row, int col$)\{$

return $0$;

$\}$

$/**$

$*$ Create and return a new Matrix that is a copy

$*$ of this matrix, but with all values multiplied by a scale

$*$ value.

$*$ pre: none

$*$ post: returns a new Matrix with all elements in this matrix

$*$ multiplied by factor.

$*$ In other words after this method has been called

$*$ returned$\_$matrix.getVal$($r$,$c$)=$ original$\_$matrix.getVal$($r$,$ c$)*$ factor

$*$ for all valid r and c$.$

$*$ @param factor the value to multiply every cell in this Matrix by$.$

$*$ @return a MathMatrix that is a copy of this MathMatrix, but with all

$*$ values in the result multiplied by factor.

$*/$

public MathMatrix getScaledMatrix$($int factor$)\{$

return null;

$\}$