Substitute multiple values to array of expressions

I have the following code that forms 4 symbolic equations (xs1, xs2, xs3, xs4) using 4 symbolic variables (x1, x2, x3, x4). Problem is, I cannot substitute numeric values into the equations.

A=[9,1,1,1;1,8,1,1;1,1,7,1;1,1,1,6];
B=[75;54;43;34];
x=sym('x',[1 4]);
xs=sym('xs',[1 4]);
xs(1:4)=0;
for i=1:4
	for j=1:4
		if(j==i)
			continue
		end
		xs(i)=xs(i)-x(j);
	end
	xs(i)=1/A(i,i)*(B(i)+xs(i));
end

What I tried,

x(1:4)=0;
subs(xs);

%another one

subs(xs(1),{x(1),x(2),x(3),x(4)},{[0,0,0,0]})

None worked. How do I do this?

Answer 1

[Star Strider]

The ‘x’ values are not ‘x1’, ‘x2’, ..., but ‘x(1)’, ‘x(2)’, ...

Try this instead:

q = subs(xs(1),{x(1),x(2),x(3),x(4)},{[0,0,0,0]});

(Asssign it to whatever variable name you want.)

[Yavuz Selim Tozlu]

I'm pretty sure I've tried this before, and it didn't seem to work back then. Now it works just fine. I was probably doing something wrong. Thanks!

[Star Strider]

As always, my pleasure!