im constantly getting this error in my matlab code can someone expalin what i should do or how it should be

2 次查看（过去 30 天）

lateef 2024-3-14

回答： Walter Roberson 2024-3-14

Variable q4 must be of data type sym. It is currently of type symfun. Check where the variable is assigned a value.

syms x y
g(x,y)=x*y/(x^2+y^2);
fyxx=diff(diff(diff(g,y),x),x);
point=[1.2,3.8];
q4=subs(fyxx,{x,y},point);

lateef 2024-3-14

The original question is assign g(x,y)=xy/x^2+y^2 and calculate Fyxx(1.2,3.8) (triple derivative!) and assign the result to q4.

Walter Roberson 2024-3-14

q4 = subs(fyxx(x, y), [x,y], point);

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