MATLAB Function (Solving an Error)

Question

I have one file with the following code:

function fx=ff(x)
fx=x;

I have another file with the following code:

function g = Lapl         


        

Answer 1

You can also use the TRAPZ function to perform trapezoidal numerical integration. Here is an example:

%# parameters
a = 0; b = 1;
N = 100; s = 1;
f = @(x) x;

%# integration
X = linspace(a,b,N);
Y = f(X).*exp(-s*X);
If = trapz(X,Y)        %# value returned: 0.26423

%# plot
area(X,Y, 'FaceColor',[.5 .8 .9], 'EdgeColor','b', 'LineWidth',2)
grid on, set(gca, 'Layer','top', 'XLim',[a-0.5 b+0.5])
title('$\int_0^1 f(x) e^{-sx} \,dx$', 'Interpreter','latex', 'FontSize',14)