changing expression to function
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i have the values for a=[],b=[],reg1=[],reg2=[], i want to change the expr = expr + w(r2) * (sqrt((x(r1)-a(i))^2 + (y(r1)-b(i))^2)) - w(r1) * (sqrt((x(r2)-a(i))^2 + (y(r2)-b(i))^2)) into a function.
expr = optimexpr;
for i = 1:numel(a)
r1 = reg1(i);
r2 = reg2(i);
%syms expr x y w
disp(expr)
expr = expr + w(r2) * (sqrt((x(r1)-a(i))^2 + (y(r1)-b(i))^2)) - w(r1) * (sqrt((x(r2)-a(i))^2 + (y(r2)-b(i))^2));
is the following method is correct:
syms expr x y w
disp(expr)
ht=matlabFunction(expr);
Also, if I want to perform minimization of the expr = expr + w(r2) * (sqrt((x(r1)-a(i))^2 + (y(r1)-b(i))^2)) - w(r1) * (sqrt((x(r2)-a(i))^2 + (y(r2)-b(i))^2)), after changing into a function, please suggest a way
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Respuestas (1)
Dyuman Joshi
el 15 de En. de 2024
You will have to define x and y as symbolic variables first -
%Random values for example
a = rand(1,10);
b = rand(1,10);
reg1 = randperm(n);
reg2 = randperm(n);
w = randperm(n);
n = numel(a);
syms x y [1 n]
size(x)
size(y)
expr = 0;
for i = 1:numel(a)
r1 = reg1(i);
r2 = reg2(i);
expr = expr + w(r2) * (sqrt((x(r1)-a(i))^2 + (y(r1)-b(i))^2)) - w(r1) * (sqrt((x(r2)-a(i))^2 + (y(r2)-b(i))^2));
end
%display the expression
disp(expr)
%Convert the expression to a function handle with vector inputs arguments
F = matlabFunction(expr, "Vars", {x, y})
2 comentarios
Dyuman Joshi
el 15 de En. de 2024
Do you have the Symbolic Math Toolbox licensed and installed?
Type "ver" and see if you have it installed
ver
If you don't have it installed, run this code and see if you have the Toolbox licensed or not -
[status,errmsg] = license('checkout','Symbolic_Toolbox')
If status is 1, you have it licensed. You can download and install the toolbox from the Add-ons.
If status is 0, you will need to purchase the toolbox.
Ver también
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