i want to calculate the jacobian with known values of A B and V2, the answer should be 14 -4 0; -4 9 0; 0 0 14

syms A B D E F V2 P2 P3 Q3; 
P2=10*V2*sin(A)+4*V2*sin(A-B)+1.5;
P3=5*sin(B)+4*sin(B-A)-1;
Q3=-10*V2*cos(B)+14*(V2^2)-4*V2*cos(A-B)+.8;
D=[P2;P3;Q3];
E=[A,B,V2];
J=jacobian(D,E)
A=0;
B=0;
V2=1;
D=[P2;P3;Q3];
F=[A;B;V2]
J=jacobian(D,F)
P2_1=10*V2*sin(A)+4*V2*sin(A-B)+1.5
P3_1=5*sin(B)+4*sin(B-A)-1
Q3_1=-10*V2*cos(B)+14*(V2^2)-4*V2*cos(A-B)+.8

Error Message is as follows:

Error using sym/jacobian (line 44)

Second argument must be a vector of variables.

Error in matlab_NR2 (line 14)

J=jacobian(D,F)

Answer 1

[David Hill]

syms A B D E F V2 P2 P3 Q3; 
P2=10*V2*sin(A)+4*V2*sin(A-B)+1.5;
P3=5*sin(B)+4*sin(B-A)-1;
Q3=-10*V2*cos(B)+14*(V2^2)-4*V2*cos(A-B)+.8;
D=[P2;P3;Q3];
E=[A,B,V2];
J=jacobian(D,E);
j=subs(J,[A,B,V2],[0,0,1]);%use subs function to substitute values in