Solving and Plotting Arrays

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Curious 2022-6-4

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https://ww2.mathworks.cn/matlabcentral/answers/1733835-solving-and-plotting-arrays

评论： Curious 2022-6-4

I am trying to find and plot the values of xSol and ySol by using x and y arrays as follow:

clc
clear all
% DME COORDINATES
x1= 2;  y1= 10; % DME 1
x2= 15; y2= 30; % DME 2
x3= 20; y3= 3;  % DME 3
% ASSUMED POSITION OF OBJECT
x = [10,25,31,35,40];
y = [20,30,41,49,56];
% DISTANCE OF OBJECT TO DMEs
r1 = sqrt((x-x1).^2+(y-y1).^2);
r2 = sqrt((x-x2).^2+(y-y2).^2);
r3 = sqrt((x-x3).^2+(y-y3).^2);
% EQUATIONS
syms x y
eqn1 = 2*x*(x2-x1)+2*y*(y2-y1) == (r1.^2) - (r2.^2) + (x2.^2) - (x1.^2) + (y2.^2) - (y1.^2);
eqn2 = 2*x*(x3-x1)+2*y*(y3-y1) == (r1.^2) - (r3.^2) + (x3.^2) - (x1.^2) + (y3.^2) - (y1.^2);
sol = solve([eqn1, eqn2], [x, y]);
i=length(x);
j=length(y);
for k=1:i
    
    xSol = sol.x(k);
end
Index exceeds the number of array elements. Index must not exceed 0.

Error in indexing (line 1075)
            R_tilde = builtin('subsref',L_tilde,Idx);
for m=1:j
    ySol = sol.y(m);
end
plot(xSol,ySol,'LineWidth',4)

But it gives me error saying index exceeds. Kindly help!

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Star Strider 2022-6-4

My pleasure!

I just wish I could have found a solution for you!

Curious 2022-6-4

I don't need a solution, having no solution is just a case. I am making a program that can solve this system of equations on different positions of x,y and plot those points. Well, at some points the systems may say it has no solution;)

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