Solve a system of equations having variables as a arrays

I am trying this code in MATLAB, but getting errors

clear all

close all

clc

syms x(i)

eq1= x(1) + 3*x(2) == 7

eq2= x(1) + x(2) == 2

eq=[eq1,eq2]

v=[x(1),x(2)]

solve(eq,v)

Why i cant solve these system of equations using solve? Kindly guide me it will be of immense help.

Answer 1

[Star Strider]

You need to define ‘x’ as a vector uisng the sym function.

Then it works:

syms x 
x = sym('x',[1 2]);                                 % <— ADD THIS ASSIGNMENT
eq1= x(1) + 3*x(2) == 7;
eq2= x(1) + x(2)   == 2;
eq=[eq1,eq2];
v=[x(1),x(2)];
vs = solve(eq,v);
X = [vs.x1, vs.x2]

producing:

X =
[ -1/2, 5/2]

No other changes in your code are necessary.

Answer 2

[madhan ravi]

syms x y %where x is x(1) and y is x(2) change it throughout the code you will get the result

after solving for x and y define variable arrays and use subs(x) and subs(y) to substitute all the points