Code for Matrix program in basic C?

Question

I want to know the basic outline of the coding for this program. Should i make global variables and then use switch statements? Do i use while and for loops? Anyone know any websites that can help me out with the matrix program in C? I need the coding for adding, multiplication and transpose

Answer 1

see this link:
http://www.phanderson.com/C/mat_mult.html
http://www.phanderson.com/C/mat_add.html

Transposition:
TransposeByteMatrix (void *NewMatrix, void *OldMatrix, int Columns, int Rows)
{
unsigned char *Source;
unsigned char *Destination;
int idx;
int Limit;
int Bias;

Source = (unsigned char *)OldMatrix; /* Could also recast on the fly for every access */
Destination = (unsigned char *)NewMatrix; /* Ditto */
Limit = Rows * Columns;
Bias = 0;

for (idx = 0; idx < Limit; idx++)
{
Destination[Bias] = Source[idx]; /* Move the byte */
Bias = (Bias + Columns) % Limit; /* Compute the position for the next byte */
}
}

Answer 2

A matrix is just a multi-dimensional array. To be specific, it's a two-dimensional array. So just a couple arrays to hold the type of data you need will work.

Suppose you are making a word search and need a 20x20 matrix. You can define it as

char myMatrix[20][20];

Good enough - you now have a 20x20 matrix. Accessing each position is simple...

myMatrix[10][10] = 'A';

We've just placed the letter a in the middle of the matrix. To fill the entire matrix with the letter A, just do something like:

for (x=0; x<20; x++) {
for (y=0; y<20; y++)
matrix[x][y]='A';
}
You can have a matrix of any datatype - that's up to you. And to make it global or not is also up to you.

Answer 3

/*demo of matrix-addition*/
#include
void main()
{
int a[3][3],b[3][3],c[3][3];
int i,j,m,n,p,q;
clrscr();
printf("Enter order of matrix A");
scanf("%d%d",&m,&n);
printf("Enter order of matrix B");
scanf("%d%d",&p,&q);
if((m!=p)||(n!=q))
{
printf("Addn. not possible");
}
else
{
for(i=0;i {
for(j=0;j {
printf("Enter element of matrix A");
scanf("%d",&a[i][j]);
}
}
for(i=0;i {
for(j=0;j {
printf("Enter element of matrix B");
scanf("%d",&b[i][j]);
}
}
for(i=0;i {
for(j=0;j {
c[i][j]=a[i][j]+b[i][j];
}
}
printf("Matrix C is");
for(i=0;i {
for(j=0;j {
printf("%d\t",c[i][j]);
}
printf("\n");
}
}
getch();
}
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/*demo of matrix-multiplication*/
#include
void main()
{
int a[3][3],b[3][3],c[3][3];
int i,j,k,m,n,p,q;
clrscr();
printf("enter order of matrix A");
scanf("%d%d",&m,&n);
printf("enter order of matrix B");
scanf("%d%d",&p,&q);
if(n!=p)
{
printf("multiplication not possible");
}
else
{
for(i=0;i {
for(j=0;j {
printf("enter elements of matrix A");
scanf("%d",&a[i][j]);
}
}
for(i=0;i {
for(j=0;j {
printf("enter elements of matrix B");
scanf("%d",&b[i][j]);
}
}
printf("order of matrix C is %dx%d",m,q);
for(i=0;i {
for(j=0;j {
c[i][j]=0;
for(k=0;k {
c[i][j]=c[i][j] + a[i][k] * b[k][j];
}
}
}
printf("matrix C is \n");
for(i=0;i {
for(j=0;j {
printf("%d\t",c[i][j]);
}
printf("\n");
}
}
getch();
}
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//To get transpose matrix of 3x3 input matrix
#include
main()
{
int a[3][3],i,j;
clrscr();
printf("enter elements of 3x3 matrix");
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
scanf("%d",&a[i][j]);
}}

//to print the matrix as entered
printf("\nThe entered matrix is:\n");
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
printf("%3d",a[i][j]);
}
printf("\n");
}

//to transpose the matrix
printf("\nThe transpose matrix is:\n");
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
printf("%3d",a[j][i]);
}
printf("\n");
}
getch();
}