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To use the DisplayPerf utility the following 2 things should
be added to your code (as well as including DisplayPerf.m in
your project)
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Add the following to your main shell:

%global variables declarations
global	gPerfCnt gPerf gDebug

%global variables initialization
gDebug	= 1;	%enable debugging/performance
DisplayPerf('init', tol, b);	%b=row vector, tol=scalar

%add this line before making each call to your function
% implementing the numerical algorithm (e.g. GaussSeidel)
DisplayPerf('reset');
...
%call to your function implementing the numerical algorithm
x = GaussSeidel(A, x0, b, tol);
...
%add this line after making each call to your function
% implementing the numerical algorithm
if gDebug
	DisplayPerf('Gauss-Seidel', A, b, x);	%A=matrix, b=row vector, x=col vector
end

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Add the following inside the loop of each of your function implementation:
%for debugging and performance
global	gPerfCnt gPerf gDebug

while (err > tol)
	...
	if gDebug
		gPerfCnt	= gPerfCnt + 1;
		gPerf.err(gPerfCnt)	= err %error between successive approximations
		gPerf.Xn(gPerfCnt,:) 	= x'; %row vector of your next approximation
	end
end	%while