/* *
* Title:
* Description:
* Copyright: Copyright (c)
* Company:
* @author
* @version 1.0
*/
package umontreal.iro.lecuyer.rng;
import umontreal.iro.lecuyer.util.ArithmeticMod;
import umontreal.iro.lecuyer.util.PrintfFormat;
import java.io.Serializable;
/**
* The same generator as {@link MRG32k3a}, except here it is implemented
* with type long instead of double.
* (See {@link MRG32k3a} for more information.)
*
*/
public class MRG32k3aL extends RandomStreamBase {
private static final long serialVersionUID = 70510L;
//La date de modification a l'envers, lire 10/05/2007
// Private constants %%%%%%%%%%%%%%%%%%%%%%%%%%
private static final long m1 = 4294967087L;
private static final long m2 = 4294944443L;
private static final long a12 = 1403580L;
private static final long a13n = 810728L;
private static final long a21 = 527612L;
private static final long a23n = 1370589L;
private static final long two17 = 131072L;
private static final long two53 = 9007199254740992L;
private static final double invtwo24 = 5.9604644775390625e-8;
private static final double norm = 2.328306549295727688e-10;
// private static final double norm = 1.0 / (m1 + 1.0);
/* Unused
private static final double InvA1[][] = { // Inverse of A1p0
{ 184888585.0, 0.0, 1945170933.0 },
{ 1.0, 0.0, 0.0 },
{ 0.0, 1.0, 0.0 }
};
private static final double InvA2[][] = { // Inverse of A2p0
{ 0.0, 360363334.0, 4225571728.0 },
{ 1.0, 0.0, 0.0 },
{ 0.0, 1.0, 0.0 }
};
*/
private static final long A1p0[][] = {
{ 0L, 1L, 0L },
{ 0L, 0L, 1L },
{ -810728L, 1403580L, 0L }
};
private static final long A2p0[][] = {
{ 0L, 1L, 0L },
{ 0L, 0L, 1L },
{ -1370589L, 0L, 527612L }
};
private static final long A1p76[][] = {
{ 82758667L, 1871391091L, 4127413238L },
{ 3672831523L, 69195019L, 1871391091L },
{ 3672091415L, 3528743235L, 69195019L }
};
private static final long A2p76[][] = {
{ 1511326704L, 3759209742L, 1610795712L },
{ 4292754251L, 1511326704L, 3889917532L },
{ 3859662829L, 4292754251L, 3708466080L }
};
private static final long A1p127[][] = {
{ 2427906178L, 3580155704L, 949770784L },
{ 226153695L, 1230515664L, 3580155704L },
{ 1988835001L, 986791581L, 1230515664L }
};
private static final long A2p127[][] = {
{ 1464411153L, 277697599L, 1610723613L },
{ 32183930L, 1464411153L, 1022607788L },
{ 2824425944L, 32183930L, 2093834863L }
};
// Private variables for each stream %%%%%%%%%%%%%%%%%%%%%%%%
// Default seed of the package for the first stream
private static long nextSeed[] = {12345, 12345, 12345,
12345, 12345, 12345};
private long Cg0, Cg1, Cg2, Cg3, Cg4, Cg5;
private long Bg[] = new long[6];
private long Ig[] = new long[6];
// The arrays Cg, Bg and Ig contain the current state,
// the starting point of the current substream,
// and the starting point of the stream, respectively.
//multiply the first half of v by A with a modulo of m1
//and the second half by B with a modulo of m2
private static void multMatVect(long[] v, long[][] A, long m1,
long[][] B, long m2) {
long[] vv = new long[3];
for(int i = 0; i < 3; i++)
vv[i] = v[i];
ArithmeticMod.matVecModM(A, vv, vv, m1);
for(int i = 0; i < 3; i++)
v[i] = vv[i];
for(int i = 0; i < 3; i++)
vv[i] = v[i + 3];
ArithmeticMod.matVecModM(B, vv, vv, m2);
for(int i = 0; i < 3; i++)
v[i + 3] = vv[i];
}
public MRG32k3aL() {
name = null;
anti = false;
prec53 = false;
for(int i = 0; i < 6; i++)
Ig[i] = nextSeed[i];
resetStartStream();
multMatVect(nextSeed, A1p127, m1, A2p127, m2);
}
/**
* @param name name of the stream
*
*/
public MRG32k3aL (String name) {
this();
this.name = name;
}
/**
* @param seed array of 6 elements representing the seed
*
*
*/
public static void setPackageSeed (long seed[]) {
// Must use long because there is no unsigned int type.
if (seed.length < 6)
throw new IllegalArgumentException ("Seed must contain 6 values");
if (seed[0] == 0 && seed[1] == 0 && seed[2] == 0)
throw new IllegalArgumentException
("The first 3 values must not be 0");
if (seed[5] == 0 && seed[3] == 0 && seed[4] == 0)
throw new IllegalArgumentException
("The last 3 values must not be 0");
final long m1 = 4294967087L;
if (seed[0] >= m1 || seed[1] >= m1 || seed[2] >= m1)
throw new IllegalArgumentException
("The first 3 values must be less than " + m1);
final long m2 = 4294944443L;
if (seed[5] >= m2 || seed[3] >= m2 || seed[4] >= m2)
throw new IllegalArgumentException
("The last 3 values must be less than " + m2);
for (int i = 0; i < 6; ++i)
nextSeed[i] = seed[i];
}
/**
* @param seed array of 6 integers representing the new seed
*
*
*/
public void setSeed (long seed[]) {
// Must use long because there is no unsigned int type.
if (seed.length < 6)
throw new IllegalArgumentException ("Seed must contain 6 values");
if (seed[0] == 0 && seed[1] == 0 && seed[2] == 0)
throw new IllegalArgumentException
("The first 3 values must not be 0");
if (seed[3] == 0 && seed[4] == 0 && seed[5] == 0)
throw new IllegalArgumentException
("The last 3 values must not be 0");
final long m1 = 4294967087L;
if (seed[0] >= m1 || seed[1] >= m1 || seed[2] >= m1)
throw new IllegalArgumentException
("The first 3 values must be less than " + m1);
final long m2 = 4294944443L;
if (seed[3] >= m2 || seed[4] >= m2 || seed[5] >= m2)
throw new IllegalArgumentException
("The last 3 values must be less than " + m2);
for (int i = 0; i < 6; ++i)
Ig[i] = seed[i];
resetStartStream();
}
public void resetStartStream() {
for (int i = 0; i < 6; ++i)
Bg[i] = Ig[i];
resetStartSubstream();
}
public void resetStartSubstream() {
Cg0 = Bg[0];
Cg1 = Bg[1];
Cg2 = Bg[2];
Cg3 = Bg[3];
Cg4 = Bg[4];
Cg5 = Bg[5];
}
public void resetNextSubstream() {
multMatVect(Bg, A1p76, m1, A2p76, m2);
resetStartSubstream();
}
/**
* @return the current state of the generator
*
*/
public long[] getState() {
return new long[]{Cg0, Cg1, Cg2, Cg3, Cg4, Cg5};
}
/**
* @return the state of the generator, formated as a string
*
*/
public String toString() {
PrintfFormat str = new PrintfFormat();
str.append ("The current state of the MRG32k3aL");
if (name != null && name.length() > 0)
str.append (" " + name);
str.append (":" + PrintfFormat.NEWLINE + " Cg = { ");
str.append ( Cg0 + ", ");
str.append ( Cg1 + ", ");
str.append ( Cg2 + ", ");
str.append ( Cg3 + ", ");
str.append ( Cg4 + ", ");
str.append ( Cg5 + " }" + PrintfFormat.NEWLINE +
PrintfFormat.NEWLINE);
return str.toString();
}
/**
* @return the detailed state of the generator, formatted as a string
*
*/
public String toStringFull() {
PrintfFormat str = new PrintfFormat();
str.append ("The MRG32k3aL stream");
if (name != null && name.length() > 0)
str.append (" " + name);
str.append (":" + PrintfFormat.NEWLINE + " anti = " +
(anti ? "true" : "false")).append(PrintfFormat.NEWLINE);
str.append (" prec53 = " + (prec53 ? "true" : "false")).append(PrintfFormat.NEWLINE);
str.append (" Ig = { ");
for (int i = 0; i < 5; i++)
str.append ( Ig[i] + ", ");
str.append ( Ig[5] + " }" + PrintfFormat.NEWLINE);
str.append (" Bg = { ");
for (int i = 0; i < 5; i++)
str.append ( Bg[i] + ", ");
str.append ( Bg[5] + " }" + PrintfFormat.NEWLINE);
str.append (" Cg = { ");
str.append ( Cg0 + ", ");
str.append ( Cg1 + ", ");
str.append ( Cg2 + ", ");
str.append ( Cg3 + ", ");
str.append ( Cg4 + ", ");
str.append ( Cg5 + " }" + PrintfFormat.NEWLINE +
PrintfFormat.NEWLINE);
return str.toString();
}
/**
* @return A deep copy of the current generator
*
*/
public MRG32k3aL clone() {
MRG32k3aL retour = null;
retour = (MRG32k3aL)super.clone();
retour.Bg = new long[6];
retour.Ig = new long[6];
for (int i = 0; i<6; i++) {
retour.Bg[i] = Bg[i];
retour.Ig[i] = Ig[i];
}
return retour;
}
protected double nextValue() {
int k;
long p1, p2;
/* Component 1 */
p1 = (a12 * Cg1 - a13n * Cg0) % m1;
if (p1 < 0)
p1 += m1;
Cg0 = Cg1;
Cg1 = Cg2;
Cg2 = p1;
/* Component 2 */
p2 = (a21 * Cg5 - a23n * Cg3) % m2;
if (p2 < 0)
p2 += m2;
Cg3 = Cg4;
Cg4 = Cg5;
Cg5 = p2;
/* Combination */
return (double)((p1 > p2) ? (p1 - p2) * norm : (p1 - p2 + m1) * norm);
}
}
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