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Symbolic function expected 3 inputs and received 2

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Usman Saleem
Usman Saleem 2021-3-10
回答： Cris LaPierre 2021-3-10
I want to compute the following code.
syms u(x,y,t) v(x,y,t) w(x,y,t) a1 a2 mu p(x,y,t) r x y
I=[1,0;0,1];
VV = [diff(u,x),diff(v,x);diff(u,y),diff(v,y)];
A1 = VV+transpose(VV);
A2 = diff(A1,t)+A1*VV+transpose(VV)*A1;
T = -p*I+mu*A1+a1*A2+a2*(A1)^2;
ANS1 = 1/r*(diff(T(1,1),x)+diff(T(1,2),y))
but gets the following error:
Error using symfun/subsref (line 141)
Symbolic function expected 3 inputs and received 2.
Error in as1 (line 27)
ANS1 = 1/r*(diff(T(1,1),x)+diff(T(1,2),y))
Need guidance!

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采纳的回答

Cris LaPierre
Cris LaPierre 2021-3-10
T is a defined using p(x,y,t). This causes T to also be a function with the same 3 inputs.
However, when you call T in your calculation of ANSI, you use T(1,1) and T(1,2). There are only 2 inputs when 3 were expected.

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