Question

You will write a program in C that multiplies a matrix by a vector, using MATLAB to check the results. Create a program in MATLAB to solve the Topic 5 "File I/O" assignment. Use any built-in MATLAB functions of your choice. Some might require you to change your input files slightly; if so, document what you did and explain why. Compare and contrast the C and MATLAB versions of your code. works in matlab

Answer 1

Code in C

#include<stdio.h>

#include<string.h>

#include<stdlib.h>

#include<stdbool.h>

int main(){

    int mat[3][3]={{1,2,3},{4,5,6},{7,8,9}};

    int m=3, n=3;

    int vec[3][1]={{5},{1},{2}};

    

    printf("Matrix\n");

    for(int i=0;i<3;i++){

        for(int j=0;j<3;j++)

            printf("%d ",mat[i][j]);

        printf("\n");

    }

    printf("\nVector:\n");

    for(int i=0;i<3;i++){

        printf("%d \n",vec[i][0]);

    }

    printf("\nProduct\n");

    for(int i=0;i<m;i++){

        int sum=0;

        for(int j=0;j<n;j++)

            sum+=mat[i][j]*vec[j][0];

        printf("%d \n",sum);

    }

}

Same Code in matlab

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contrast: No loops in matlab, 3 lines of code. No printf statement.

File IO in matlab

(text file)

Code

x = 0:0.1:pi;
s = sin(x);
A = [x;s];
fID = fopen('sinx.txt','w');
fprintf(fID,'%6s %12s\r\n','x','sin(x)');
fprintf(fID,'%6.2f %12.8f\r\n',A);
fclose(fID);

this code generate table of sin(x) in a text file called sinx.txt

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