Many students ask me how do I do this or that in MATLAB. So I thought why not have a small series of my next few blogs do that. In this blog, I show you how to solve simultaneous linear equations given in equation form.

- The MATLAB program link is here.
- The HTML version of the MATLAB program is here.
**DO NOT COPY AND PASTE THE PROGRAM BELOW BECAUSE THE SINGLE QUOTES DO NOT TRANSLATE TO THE CORRECT SINGLE QUOTES IN MATLAB EDITOR.****DOWNLOAD THE MATLAB PROGRAM****INSTEAD**

%% HOW DO I DO THAT IN MATLAB SERIES?

% In this series, I am answering questions that students have asked

% me about MATLAB. Most of the questions relate to a mathematical

% procedure.

%% TOPIC

% How do I solve a set of simultaneous linear equations

% given in equation form?

%% SUMMARY

% Language : Matlab 2008a;

% Authors : Autar Kaw;

% Mfile available at

% http://nm.mathforcollege.com/blog/sle_equations.m;

% Last Revised : August 22, 2009;

% Abstract: This program shows you how to solve a set of

% simultaneous linear equations given in equation form?

% .

clc

clear all

clf

%% INTRODUCTION

disp(‘ABSTRACT’)

disp(‘ This program shows you how to solve a’)

disp(‘ set of simultaneous linear equations given in equation form’)

disp(‘ ‘)

disp(‘AUTHOR’)

disp(‘ Autar K Kaw of https://autarkaw.wordpress.com’)

disp(‘ ‘)

disp(‘MFILE SOURCE’)

disp(‘ http://nm.mathforcollege.com/blog/sle_equations.m’)

disp(‘ ‘)

disp(‘LAST REVISED’)

disp(‘ August 22, 2009’)

disp(‘ ‘)

%% INPUTS

% Enter the equations

eqn1=’12*a+23*b+39*c=29′;

eqn2=’13*a+17*b+19*c=37′;

eqn3=’21*a+23*b+29*c=59’;

%% DISPLAYING INPUTS

disp(‘ ‘)

disp(‘INPUTS’)

disp(‘________________________’)

disp(‘Equations’)

disp(‘________________________’)

disp(eqn1)

disp(eqn2)

disp(eqn3)

%% THE CODE

% The solution

X=solve(eqn1,eqn2,eqn3);

% Assigning the output

a=double(X.a);

b=double(X.b);

c=double(X.c);

%% DISPLAYING OUTPUTS

disp(‘ ‘)

disp(‘OUTPUTS’)

disp(‘________________________’)

disp(‘Solution Vector’)

disp(‘________________________’)

fprintf(‘\nValue of a= %g’,a)

fprintf(‘\nValue of b= %g’,b)

fprintf(‘\nValue of c= %g’,c)

disp(‘ ‘)

disp(‘________________________’)

This post is brought to you by Holistic Numerical Methods: Numerical Methods for the STEM undergraduate at http://nm.mathforcollege.com, the textbook on Numerical Methods with Applications available from the lulu storefront, and the YouTube video lectures available at http://nm.mathforcollege.com/videos and http://www.youtube.com/numericalmethodsguy

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Good job! It worked perfectly well.

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