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Merge branch 'smv1999:master' into master
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‎2D Arrays/matrices.java

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/* Title : Operations on matrices .
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Description : User need to enter the elements of the matrix A and B .
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Operations will be done on the matrices : 1.To add 2.To Subtract
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3.To multiply . User need to choose it.
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The maximum limit of total number of rows and columns : 8
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You can't generate the matrices having more than 8 number of rows and columns .
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Here , if the both matrices are of square matrix only then the multiplication can be
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done . i.e Rows(A)==Columns(B) equal fOR BA multiplication
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and Rows(B)==Columns(A) equal fOR BA multiplication . multiplication rule.
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This is done here to maintain the formate of the code and to maintain the
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multiplication of matices .
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Addition and subtraction are done as the Matrix A and B both are having same number of rows and columns .
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*/
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import java.util.Scanner;
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public class matrices
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{
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public final static int MAXLIMIT=8;
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public static void main(String[] args)
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{
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Scanner input=new Scanner (System.in);
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int opt ;
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do // Enter the data needed .
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{
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System.out.println(" Enter the number of rows and columns (Maximum limit is 8 ) : \n");
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int row=input.nextInt();
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int col=input.nextInt();
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double a[][]=new double[row][col];
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double b[][]=new double[row][col];
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if((row>MAXLIMIT)||(col>MAXLIMIT)||(row<1)||(col<1))
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{ System.out.println("\n Invalid Enteries !! \n Please try again later .");
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System.exit(0);
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}
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else
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{ System.out.println("\n ENTER THE ELEMENTS OF MATRIX A "); // Enter Matrix A
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for(int i=0;i<row;i++)
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{
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for(int j=0;j<col;j++)
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{ a[i][j]=input.nextDouble();
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} }
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System.out.println("\n ENTER THE ELEMENTS OF MATRIX B"); // Enter Matrix B
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for(int i=0;i<row;i++)
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{
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for(int j=0;j<col;j++)
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{ b[i][j]=input.nextDouble(); } }
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}
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System.out.println();
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System.out.println(" ELEMENTS OF MATRIX A"); // Matrix A
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for(int i=0;i<row;i++)
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{
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for(int j=0;j<col;j++)
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{ System.out.print( a[i][j]+ "\t"); }
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System.out.println("\n");
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}
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System.out.println();
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System.out.println(" ELEMENTS OF MATRIX B"); // Matrix B
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for(int i=0;i<row;i++)
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{
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for(int j=0;j<col;j++)
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{ System.out.print( b[i][j]+ "\t"); }
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System.out.println("\n");
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}
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int i, j ;
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System.out.println("\n1.Add \n2.Subtraction \n3.Multiplication ");
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opt=input.nextInt();
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System.out.println();
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switch(opt)
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{
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case 1 : double add[][]=new double [row][col]; // Addition of matrices A and B .
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System.out.println("Addition of matrix A and B : ");
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for(i=0;i<row;i++)
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{
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for(j=0;j<col;j++)
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{ add[i][j]=a[i][j] + b[i][j];
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System.out.print(add[i][j] +"\t"); }
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System.out.println(); }
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System.out.println();
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break ;
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case 2 : double sub1[][]=new double [row][col]; // Subtraction of matrix A from B .
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System.out.println("Subtraction of matrix A from B : ");
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for(i=0;i<row;i++)
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{
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for(j=0;j<col;j++)
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{ sub1[i][j]= -a[i][j] + b[i][j];
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System.out.print(sub1[i][j] +"\t"); }
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System.out.println(); }
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System.out.println();
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double sub2[][]=new double [row][col]; // Subtraction of matrix B from A .
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System.out.println("Subtraction of matrix B from A : ");
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for(i=0;i<row;i++)
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{
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for(j=0;j<col;j++)
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{ sub2[i][j]= a[i][j] - b[i][j];
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System.out.print(sub2[i][j] +"\t"); }
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System.out.println(); }
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System.out.println();
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break ;
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case 3 :
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System.out.println("Matrix multiplication is not commutative always.\n i.e A*B is not equals to B*A. \n");
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if(row==col)
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{
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// Multiply matrix A and B . i.e : AB
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int k;
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double sum=0 ;
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double mul1[][]=new double [row][col];
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System.out.println(" Multiplication of matrices A and B : AB ");
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for(i=0;i<row;i++)
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{
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for(j=0;j<col;j++)
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{
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for(k=0;k<col;k++)
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{ mul1[i][j]=mul1[i][j] + a[i][k]*b[k][j]; }
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}
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System.out.println(); }
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for(i=0;i<col;i++)
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{
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for(j=0;j<col;j++)
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{ System.out.print(mul1[i][j] +"\t"); }
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System.out.println();
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}
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System.out.println();
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// Multiply matrix B and A . i.e : BA
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double mul2[][]=new double [row][col];
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System.out.println(" Multiplication of matrices A and B : BA ");
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for(i=0;i<row;i++)
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{
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for(j=0;j<col;j++)
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{
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for(k=0;k<col;k++)
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{ mul2[i][j]=mul2[i][j] + b[i][k]*a[k][j]; }
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}
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System.out.println(); }
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for(i=0;i<col;i++)
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{
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for(j=0;j<col;j++)
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{ System.out.print(mul2[i][j] +"\t"); }
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System.out.println();
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}
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}
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else
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{
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System.out.println(" Multiplication is not valid . \n");
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}
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System.out.println();
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break ;
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}
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System.out.println(" Do you wish to continue ? \n1.Yes 2.No\n" );
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opt=input.nextInt();
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}while(opt!=2);
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}}
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/*
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Enter the number of rows and columns (Maximum limit is 8 ) :
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2
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2
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ENTER THE ELEMENTS OF MATRIX A
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1
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2
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3
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4
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ENTER THE ELEMENTS OF MATRIX B
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2
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2
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2
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2
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ELEMENTS OF MATRIX A
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1.0 2.0
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3.0 4.0
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ELEMENTS OF MATRIX B
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2.0 2.0
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2.0 2.0
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1.Add
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2.Subtraction
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3.Multiplication
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1
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Addition of matrix A and B :
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3.0 4.0
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5.0 6.0
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Do you wish to continue ?
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1.Yes 2.No
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1
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Enter the number of rows and columns (Maximum limit is 8 ) :
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3
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3
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ENTER THE ELEMENTS OF MATRIX A
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12
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13
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14
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15
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16
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17
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18
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19
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20
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ENTER THE ELEMENTS OF MATRIX B
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2
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2
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2
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2
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2
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2
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2
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2
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2
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ELEMENTS OF MATRIX A
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12.0 13.0 14.0
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15.0 16.0 17.0
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18.0 19.0 20.0
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ELEMENTS OF MATRIX B
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2.0 2.0 2.0
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2.0 2.0 2.0
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2.0 2.0 2.0
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1.Add
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2.Subtraction
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3.Multiplication
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2
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Subtraction of matrix A from B :
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-10.0 -11.0 -12.0
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-13.0 -14.0 -15.0
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-16.0 -17.0 -18.0
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Subtraction of matrix B from A :
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10.0 11.0 12.0
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13.0 14.0 15.0
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16.0 17.0 18.0
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Do you wish to continue ?
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1.Yes 2.No
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1
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Enter the number of rows and columns (Maximum limit is 8 ) :
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2
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2
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ENTER THE ELEMENTS OF MATRIX A
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1
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2
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44
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45
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ENTER THE ELEMENTS OF MATRIX B
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2
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2
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3
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33
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ELEMENTS OF MATRIX A
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1.0 2.0
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44.0 45.0
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ELEMENTS OF MATRIX B
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2.0 2.0
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3.0 33.0
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1.Add
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2.Subtraction
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3.Multiplication
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3
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Matrix multiplication is not commutative always.
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i.e A*B is not equals to B*A .
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Multiplication of matrices A and B : AB
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8.0 68.0
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223.0 1573.0
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Multiplication of matrices A and B : BA
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90.0 94.0
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1455.0 1491.0
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Do you wish to continue ?
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1.Yes 2.No
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2
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*/

‎2D Arrays/sort_matrix_diagonally.py

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def sortDiagonal(a, M, N):
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# Loop to find the ith minimum
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# element from the major diagonally
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for i in range(M):
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sm = a[i][i]
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pos = i
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# Loop to find the minimum
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# element from the unsorted matrix
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for j in range(i + 1 , N):
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if (sm > a[j][j]):
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sm = a[j][j]
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pos = j
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# Swap to put the minimum
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# element at the beginning of
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# the major diagonal of matrix
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a[i][i], a[pos][pos] = a[pos][pos] , a[i][i]
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# Loop to print the matrix
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for i in range(M):
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for j in range(N):
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print(a[i][j],end=" ")
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print()
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# Driven Code
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a = [[4, 2],[3, 1]]
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# Sort the major Diagonally
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sortDiagonal(a, 2, 2)

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