Package linalg.util

Class LinAlgArrayUtils

java.lang.Object

linalg.util.LinAlgArrayUtils

public class LinAlgArrayUtils
extends Object

Contains some utility functions to manipulate arrays.

Method Summary

Modifier and Type	Method	Description
static CNumber[]	abs(CNumber[] arr)
static boolean	contains(int[] arr, int value)
static CNumber[][]	extend2D(double[] arr, int axis)	Extends a 1D array to 2D along a specified axis.
static CNumber[][]	extend2D(int[] arr, int axis)	Extends a 1D array to 2D along a specified axis.
static CNumber[][]	extend2D(CNumber[] arr, int axis)	Extends a 1D array to 2D along a specified axis.
static CNumber[]	flatten(CNumber[][] arr)
static String	getDims(CNumber[][] arr)
static CNumber[][]	getSection(CNumber[][] data, int rowStart, int rowEnd, int colStart, int colEnd)
static CNumber[]	group(CNumber[] values)
static CNumber	norm(CNumber[] arr)	Computes norm of an array as if it was a vector.
static void	printArr(CNumber[] arr)
static void	printArr(CNumber[][] arr)
static CNumber[][]	randn(int rows, int cols, boolean complex)
static CNumber[][]	random(int rows, int cols)
static CNumber[][]	random(int rows, int cols, double mag)
static CNumber[][]	random(int rows, int cols, double min, double max, boolean... magnitude_flag)
static CNumber[][]	randomComplex(int rows, int cols)
static CNumber[][]	zeros(int rows, int cols)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

random

public static CNumber[][] random(int rows,
 int cols,
 double min,
 double max,
 boolean... magnitude_flag)

random

public static CNumber[][] random(int rows,
 int cols)

random

public static CNumber[][] random(int rows,
 int cols,
 double mag)

randomComplex

public static CNumber[][] randomComplex(int rows,
 int cols)

randn

public static CNumber[][] randn(int rows,
 int cols,
 boolean complex)

printArr

public static void printArr(CNumber[][] arr)

printArr

public static void printArr(CNumber[] arr)

getDims

public static String getDims(CNumber[][] arr)

zeros

public static CNumber[][] zeros(int rows,
 int cols)

abs

public static CNumber[] abs(CNumber[] arr)

flatten

public static CNumber[] flatten(CNumber[][] arr)

getSection

public static CNumber[][] getSection(CNumber[][] data,
 int rowStart,
 int rowEnd,
 int colStart,
 int colEnd)

contains

public static boolean contains(int[] arr,
 int value)

extend2D

public static CNumber[][] extend2D(CNumber[] arr,
 int axis)

Extends a 1D array to 2D along a specified axis.

Parameters:

arr - - array to extend

axis - - axis along which to extend.

If axis is 0 then a new dimension will be added along the rows and the entires of arr will become the column entries. This results in a 1xarr.length 2D array.

If axis is 1, then a new dimension will be added along the columns and the antries of arr will become the row entries. This results in a arr.lengthx1 2D array.

Returns:

Array extended to 2D

extend2D

public static CNumber[][] extend2D(double[] arr,
 int axis)

Extends a 1D array to 2D along a specified axis.

Parameters:

arr - - array to extend

axis - - axis along which to extend.

If axis is 0 then a new dimension will be added along the rows and the entires of arr will become the column entries. This results in a 1xarr.length 2D array.

If axis is 1, then a new dimension will be added along the columns and the antries of arr will become the row entries. This results in a arr.lengthx1 2D array.

Returns:

Array extended to 2D

extend2D

public static CNumber[][] extend2D(int[] arr,
 int axis)

Extends a 1D array to 2D along a specified axis.

Parameters:

arr - - array to extend

axis - - axis along which to extend.

If axis is 0 then a new dimension will be added along the rows and the entires of arr will become the column entries. This results in a 1xarr.length 2D array.

If axis is 1, then a new dimension will be added along the columns and the antries of arr will become the row entries. This results in a arr.lengthx1 2D array.

Returns:

Array extended to 2D

norm

public static CNumber norm(CNumber[] arr)

Computes norm of an array as if it was a vector.

Returns:

Norm of array

group

public static CNumber[] group(CNumber[] values)