MATLAB: How to enter this equation in matlab

boundsenter function

How do I enter this function into a script file? V is a function of R, and k1, CA0, X, Fa,in and k2 are defined, I just don't know how to tell matlab to evaluate that function with the upper and lower bounds as specified by the brackets. Thanks!

Best Answer

Use a function handle.

f = @(X) (R+1)*F*(-log(1-X)/k1/C + k2*C*X/k1 - k2*C*X^2/2/k1);
V = feval(f, X0) - feval(f, R*X0/(R+1))

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MATLAB: How to combine several functions

Hint:

    f1 = @(k1)108.4*k1;
    f2 = @(k2)108.4*k2;
    f3 = @(k3)108.4*k3;
    sumf = @(k1,k2,k3) f1(k1)+f2(k2)+f3(k3);
    sumf( 1, 2, 3 )
    ans =
      650.4000

    sumf = @(k) f1(k)+f2(k)+f3(k);
    sumf( 2 )
    ans =
      650.4000
    >>

MATLAB: Newton Raphson Method – how to return errors of each iteration in arrays

I would pull the calculations outside the loop.

for k = 1:MaxIter
    fz = feval(f, iter(k));
    dfdx = fz / (feval(f, iter(k) + delta) - fz);
    iter(k+1) = iter(k) - (dfdx * delta); %Calculates new iteration
    err = (iter(k+1)-iter(k))/iter(k+1); %calculates the error of sucessive iterations
    fz = feval(f, iter(k+1));
    if abs(err) < TolX, break; end
end
e = abs(m - iter);
y = log(e(2:end));
x = log(e(1:end-1));

Best Answer

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