Problem with symbolic math

Hello, I am trying hard to get code running, however I am stuck at a place. Please help me.

I have declared 3 symbolic variables x1,x2,x3. gr is a column vector and function of x1,x2,x3. p1 is a column vector of constants. I want to substitute values of x2,x2,x3 by first, second, and row of p1. That is x1 = 957/2500, x2=-293/1250, etc. And I want to make it as a new vector gr2. MATLAB is giving errors of inconsistent dimensions. Please help! Thanks

syms x1 x2 x3
gr =

          2*x1 + 2*x2
   2*x1 + 4*x2 + 2*x3
          2*x2 + 4*x3

p1 =

    957/2500
   -293/1250
    371/5000

gr2=subs(gr,[x1,x2,x3],[p1(1),p1(2),p1(3)]);

Answer 1

[Azzi Abdelmalek]

syms x1 x2 x3
gr =[2*x1 + 2*x2;2*x1 + 4*x2 + 2*x3; 2*x2 + 4*x3]
p1 =[957/2500;-293/1250;371/5000];
gr2=subs(gr,{x1,x2,x3},{p1(1),p1(2),p1(3)})

Answer 2

[sixwwwwww]

Dear Amit, it is working fine:

syms x1 x2 x3
gr = [2*x1 + 2*x2; 2*x1 + 4*x2 + 2*x3; 2*x2 + 4*x3];
p1 = [957/2500; -293/1250; 371/5000];
gr2 = subs(gr,[x1,x2,x3],[p1(1),p1(2),p1(3)]);

Can further explain your problem?