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Using syms, after finding diff(x,y) how to insert initial condition into diff's

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Terry Poole
Terry Poole on 20 Sep 2021
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Answered: Behzad Eydiyoonon 20 Sep 2021
So, I'm relatively new to using syms in matlab and am stuck, I have the equation and its partials solved, now I need to insert initial conditions of u1 = 0 into the solved partial derivatives. I tried doing f@ u1 = 0, to solve the function with the idea that I could take the diff's of the solved function over again but matlab is throwing an error with that approach.
symsx1 x2 u1 s1
f = 9*x1^2 - 18*x1*x2 +13*x2^2 - 4...
+ u1*(x1^2 + x2^2 + 2*x1 - 16 + s1^2);
diff(f, x1)
diff(f, x2)
diff(f, u1)
diff(f, s1)
f@ u1 = 0

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Answers (1)

Behzad Eydiyoon
Behzad Eydiyoon on 20 Sep 2021
symsx1 x2 u1 s1
f = 9*x1^2 - 18*x1*x2 +13*x2^2 - 4...
+ u1*(x1^2 + x2^2 + 2*x1 - 16 + s1^2);
A=diff(f, x1);
B=diff(f, x2);
C=diff(f, u1);
D=diff(f, s1);
u1=0;
eval(A)
eval(B)
eval(C)
eval(D)

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