MATLAB: Feasible solutions in a function with a given product.

optimization

How do I get Matlab to give me a matrix of possible solutions for ri and L when V is fixed?

Vi=((pi*(ri)^2*L)+((4*pi*(ri)^3)/3));

You can loop through various ri values and read off the resulting L values.

Alan Weiss

MATLAB mathematical toolbox documentation

You need to have ONE variable as your decision variable. Something like

function Length_Sum = objective_function(x)
l1 = x(1);
l2 = x(2);
l3 = x(3);
Length_Sum = l1 + l2 + l3; % or just use sum(x)

Similarly, pass just one variable to simple_constraint, and extract l1, l2, and l3 inside the function.

Alan Weiss

MATLAB mathematical toolbox documentation

help fmincon

Best wishes

Torsten.