MATLAB Answers

I have created code for banded gauss elimination method but on running it gives an error of index exceeds matrix dimensions

11 views (last 30 days)
Haseeb Ahmed Janjua
Haseeb Ahmed Janjua on 20 Oct 2017
Answered: Martin Olafsen on 20 Oct 2017
function x = gauss_elimination(K,M);
ln = length(M); x = zeros(ln,1);
for n=1:ln-1
for i=n+1:ln
m = K(i,n)/K(n,n);
for j=n+1:ln
K(i,j) = K(i,j)-m*K(n,j);
end
M(i) = M(i)-m*M(n);
end
end
x(ln) = M(ln)/K(ln,ln);
for i=ln-1:-1:1
S = M(i);
for j=i+1:ln
S = S-K(i,j)*x(j);
end
x(i) = S/K(i,i);
end
end
%%another function created to call gauss elimination function in it
clc
clear
%Two additional matrices A and B were added for checking the gauss elimination
%function:
A= [ 170.4105 37.9473 -113.8420 -37.9473;
37.9473 69.2176 -37.9473 -12.6491;
-113.8420 -37.9473 120.9131 45.0184;
-37.9473 -12.6491 45.0184 19.7202];
B = [0; 0; 0; -1000];
K = xlsread('HW05_Coef.xlsx');
M = csvread('HW05_Const.csv');
gauss_elimination(K,M)
  4 Comments

Sign in to comment.

Answers (1)

Martin Olafsen
Martin Olafsen on 20 Oct 2017
You use the length of M to iterate through the matrices, even though the amount of rows is different from the amount of columns in K.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by