Vector Dot Product
The Java code finds the dot product of two vectors v1 and v2. it is also called as scalar product or inner product and defined as sum of product of respective axis element of the two vectors. Their vector's element can be integer or double of java datatype.
Output
Output
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| Dot product of 2-D vectors |
 |
| Dot product of N-D vectors |
Dot product of 2D vectors
A class Vector defined two member functions named "dot-product" with parameter type difference, in order to support parameters int or double type 2D vectors.
.
Both member function can be invoked with two array parameters, which represents the vectors to be dot-product. These vectors must have 2 elements.
for example below shows how to calculate dot product two vectors A and B using above equation
for example below shows how to calculate dot product two vectors A and B using above equation
Vector A = [1 5]
Vector B = [2 3]
A.B = 1x2 + 5x3
= 2 + 15
A.B = 17
import java.util.Arrays;
public class Vector {
public static int dotproduct(int vec1[],int vec2[]) {
return (vec1[0] * vec2[0] + vec1[1] * vec2[1]);
}
public static double dotproduct(double vec1[],double vec2[]) {
return (vec1[0] * vec2[0] + vec1[1] * vec2[1]);
}
public static void main(String[] args)
{
int vector1 [] = {1,2};
int vector2 [] = {4,5};
double csim1= Vector.dotproduct(vector1, vector2);
System.out.println("nDotproduct of two 2D vectors");
System.out.println("ninteger 2D vectors");
System.out.println("Vector 1 :" + Arrays.toString(vector1));
System.out.println("Vector 2 :" + Arrays.toString(vector2));
System.out.println("DP value :" + csim1);
double vector3 [] = {5.2, 2.6};
double vector4 [] = {9.8,7.6};
System.out.println("ndouble 2D vectors");
double csim2=Vector.dotproduct(vector3, vector4);
System.out.println("Vector 1 :" + Arrays.toString(vector3));
System.out.println("Vector 2 :" + Arrays.toString(vector4));
System.out.println("DP value :" + csim2);
}
}
Output
Dotproduct of two 2D vectors integer 2D vectors Vector 1 :[1, 2] Vector 2 :[4, 5] DP value :14.0 double 2D vectors Vector 1 :[5.2, 2.6] Vector 2 :[9.8, 7.6] DP value :70.72
Dot product of N-Dimensional vectors
A class Vector defined two member functions named "dot product" with parameter type difference, in order to support parameters int or double type N - Dimensional vectors.
Both member function can be invoked with two array parameters, which represents the vectors to be dot-product. These vectors can have more than 2 elements, but same in numbers of elements.
package metric;
import java.util.Arrays;
public class Vectornd {
public static int dotproduct(int vec1[],int vec2[])
{
int dop=0;
for(int n=0;n<vec1.length;n++)
dop += vec1[0] * vec2[0];
return dop;
}
public static double dotproduct(double vec1[],double vec2[])
{
double dop=0;
for(int n=0;n<vec1.length;n++)
dop += vec1[0] * vec2[0];
return dop;
}
public static void main(String[] args)
{
int vector1 [] = {1,4,3,6};
int vector2 [] = {4,2,6,1};
double dop1= Vectornd.dotproduct(vector1, vector2);
System.out.println("n Dot Product of two ND vectors");
System.out.println("ninteger ND vectors");
System.out.println("Vector 1 :" + Arrays.toString(vector1));
System.out.println("Vector 2 :" + Arrays.toString(vector2));
System.out.println("DP value :" + dop1);
double vector3 [] = {5.2,1.3,5.7,2.6};
double vector4 [] = {9.8,7.6,12.5,4.1};
System.out.println("ndouble ND vectors");
double dop2=Vectornd.dotproduct(vector3, vector4);
System.out.println("Vector 1 :" + Arrays.toString(vector3));
System.out.println("Vector 2 :" + Arrays.toString(vector4));
System.out.println("DP value :" + dop2);
}
}
Output
Dot Product of two N-D vectors integer N-D vectors Vector 1 :[1, 4, 3, 6] Vector 2 :[4, 2, 6, 1] DP value :16.0 double N-D vectors Vector 1 :[5.2, 1.3, 5.7, 2.6] Vector 2 :[9.8, 7.6, 12.5, 4.1] DP value :203.84000000000003
References
vector dot product or inner product
vector dot product or inner product
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