 # Equations in Matlab

## Transcribed Text

Problem 1 Create a function M-file in MATLAB to solve the system of nonlinear equations (1) using the Newton-Raphson method. x 3−y 2=−1 0.5+ cos( x)tanh( y )=0 There are many solutions. Your code must find all of the real solutions with x lying between 0 and 2pi and y being positive. As well as the usual requirements of function M-files you will need to pay particular attention to termination conditions. Problem 2 Create a function M-file in MATLAB to solve an arbitrary system of linear equations by Gaussian elimination with partial pivoting. Apply the resulting M-file to solve the system of linear equations (2). Is it possible to solve this system using Gaussian elimination without pivoting? Check your results by re-solving the equations using built-in MATLAB commands. The section on matrices in experiment MS0_1 offered two ways for you to solve a system of linear equations using built-in MATLAB commands. Be aware that in this case, and for obvious reasons, the bulk of the marks will be assigned to your MATLAB code implementing the required Gaussian elimination with partial pivoting algorithm. 3.2x2+ x4−0.5x5=0 −2.1x1+ 2.2x2+ 7.5x3−1.9x4+ x5=−2.5 10x1+ 3x2+ 1.2x4+ 5.5x5=−7 2x1+ x2−5.8x3−11x4−x5=6.1 3x1−3x3−4x4+ 11x5=2.6

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Problem 1:

T=1;
n=100;m=10;
dt=T/n;
xmin=-1; xmax=1;
dx=2/m;
t=0:dt:T; x=-1:dx:1;
U=zeros(m+1,n+1);
U(:,1)=2*x'+1;
U(1,:)=-ones(n+1,1);
U(m+1,:)=3*ones(n+1,1);
alpha=dt/dx^2;
% d1=diag(ones(1,m-1));d2=diag(ones(1,m-2),1)...
%    +diag(ones(1,m-2),-1);
% A=(1+alpha)*d1-0.5*alpha*d2;
% B=(1-alpha)*d1+0.5*alpha*d2;
A=(1+alpha)*diag(ones(1,m-1))-0.5*alpha*diag(ones(1,m-2),1)...
-0.5*alpha*diag(ones(1,m-2),-1);
B=0.5*alpha*(-2*diag(ones(1,m-1))+diag(ones(1,m-2),1)...
+diag(ones(1,m-2),-1));
inv(A)
for k=1:n...
\$80.00 for this solution

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