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Class Acme.Matrix 

java.lang.Object
   |
   +----Acme.Matrix
public class Matrix
extends Object
Simple double matrix class.

Fetch the software.
Fetch the entire Acme package.

Constructor Index

o Matrix(int)
Constructor - create an identity matrix.
o Matrix(int, int)
o Matrix(int, int, double)
o Matrix(Matrix)
Constructor - copy a matrix.

Method Index

o add(Matrix, Matrix)
Add two matricies.
o equals(Object)
Equality test.
o get(int, int)
Get an element.
o getCols()
Get the column count.
o getRows()
Get the row count.
o hashCode()
Compute a hash code for the matrix.
o max()
Find the largest element.
o mean()
Compute the mean of all the elements.
o min()
Find the smallest element.
o multiply(double, Matrix)
Multiply a scalar by a matrix.
o multiply(Matrix, double)
Multiply a matrix by a scalar.
o multiply(Matrix, Matrix)
Multiply two matricies.
o set(int, int, double)
Set an element.
o solve(Matrix, Matrix)
Solve ax=b using Gaussian elimination.
o subtract(Matrix, Matrix)
Subtract one matrix from another.
o sum()
Compute the sum of all the elements.
o swapCols(int, int)
Swap columns in a matrix.
o swapRows(int, int)
Swap rows in a matrix.
o toString()
Convert to a string.
o transpose(Matrix)
Transpose a matrix.

Constructors

o Matrix 
 public Matrix(int rows,
               int cols) throws ArithmeticException
o Matrix 
 public Matrix(int rows,
               int cols,
               double value) throws ArithmeticException
o Matrix 
 public Matrix(int size) throws ArithmeticException
Constructor - create an identity matrix.

o Matrix 
 public Matrix(Matrix o) throws ArithmeticException
Constructor - copy a matrix.

Methods

o getRows 
 public int getRows()
Get the row count.

o getCols 
 public int getCols()
Get the column count.

o get 
 public double get(int row,
                   int col)
Get an element.

o set 
 public void set(int row,
                 int col,
                 double value)
Set an element.

o equals 
 public boolean equals(Object o)
Equality test.

Overrides:
equals in class Object
o hashCode 
 public int hashCode()
Compute a hash code for the matrix.

Overrides:
hashCode in class Object
o toString 
 public String toString()
Convert to a string.

Overrides:
toString in class Object
o sum 
 public double sum()
Compute the sum of all the elements.

o mean 
 public double mean()
Compute the mean of all the elements.

o max 
 public double max()
Find the largest element.

o min 
 public double min()
Find the smallest element.

o swapRows 
 public void swapRows(int r1,
                      int r2)
Swap rows in a matrix.

o swapCols 
 public void swapCols(int c1,
                      int c2)
Swap columns in a matrix.

o transpose 
 public static Matrix transpose(Matrix m)
Transpose a matrix.

o add 
 public static Matrix add(Matrix a,
                          Matrix b) throws ArithmeticException
Add two matricies.

o subtract 
 public static Matrix subtract(Matrix a,
                               Matrix b) throws ArithmeticException
Subtract one matrix from another.

o multiply 
 public static Matrix multiply(Matrix a,
                               double b)
Multiply a matrix by a scalar.

o multiply 
 public static Matrix multiply(double a,
                               Matrix b)
Multiply a scalar by a matrix.

o multiply 
 public static Matrix multiply(Matrix a,
                               Matrix b) throws ArithmeticException
Multiply two matricies.

o solve 
 public static Matrix solve(Matrix a,
                            Matrix b) throws ArithmeticException
Solve ax=b using Gaussian elimination. The matrix a must be square, and b must be a vector with the same number of rows as a. Returns another vector of the same size as b. 

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