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I have a doubt regarding declaration of a function, kindly conside the following code

fun = @GVF

sqrt_estimt = fminsearch(@(theta)ODE_fit(fun,t,y,Q,theta(1),theta(2), iniVal), theta0);

..

function err = ODE_fit(fun, exp_t, exp_y, Q, theta(1), theta(2), iniVal)

% exp_y = Experimental observation at time exp_t

[t,y] = ode45(@(t,X)fun(t,X,n, S0, Q, theta(1),theta(2)),exp_t,iniVal);

err = sum(sum((y-exp_y).^2)); % compute error between experimental y and fitted y

end

..

function dy = GVF(x, y, Q, T, g)

% T = theta(1)

% g = theta(2);

A = y*T;

V = Q/A;

P = T+2*y;

R = A/P;

Sf = (.14*V)^2/(R^(4/3));

Fr = V/sqrt(g*y);

dy = (Sf)/(1-Fr^2);

end

..

The above does not work, but the following does: Is there a way to make the above way function? Thanks

sqrt_estimt = fminsearch(@(theta)ODE_fit(fun, t, y, Q, theta, iniVal), theta0);

..

function err = ODE_fit(fun, exp_t, exp_y, Q, theta, iniVal)

% exp_y = Experimental observation at time exp_t

[t,y] = ode45(@(t,X)fun(t,X,n, S0, Q, theta(1),theta(2)),exp_t,iniVal);

err = sum(sum((y-exp_y).^2)); % compute error between experimental y and fitted y

end

..

function dy = GVF(x, y, Q, T, g)

T = theta(1)

g = theta(2);

A = y*T;

V = Q/A;

P = T+2*y;

R = A/P;

Sf = (.14*V)^2/(R^(4/3));

Fr = V/sqrt(g*y);

dy = (Sf)/(1-Fr^2);

end

Walter Roberson
on 28 Jan 2016

No, there is not. You cannot name an element of a matrix in a function header. You can use two different variables though.

function err = ODE_fit(fun, exp_t, exp_y, Q, theta1, theta2, iniVal)

% exp_y = Experimental observation at time exp_t

[t,y] = ode45(@(t,X)fun(t,X,n, S0, Q, theta1,theta2),exp_t,iniVal);

err = sum(sum((y-exp_y).^2)); % compute error between experimental y and fitted y

end

Walter Roberson
on 28 Jan 2016

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