array with function inside

I have

dk =
 
                                0
 (49*sin(x1_k))/50 - (49*x1_k)/50
 
 

and an array X 2xn

How can I obtain the array Dk 2xn where:

Dk(1, 1)= dk calculate in the point X(1,1)

Dk(2, 1)= dk calculate in the point X(2,1)

.

.

.

thanks

[darova]

Looks correct for me

(49*sin(x1_k))/50 - (49*x1_k)/50 = 0

Answer 1

[Walter Roberson]

subs(dk, x1_k, X(:, 1))