Dot indexing is not supported for variables of this type.

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When I am running my code, I get a response that a built-in with syms is not running correctly.
syms F D l t w
% Stress
n_stress = F./(t.*w);
u_nstress = sqrt((diff(n_stress,F).*u_f).^2+(diff(n_stress,t).u_c).^2+(diff(n_stress,w).*u_c).^2)
Unrecognized function or variable 'u_f'.
Dot indexing is not supported for variables of this type.
Error in sym/subsref (line 909)
R_tilde = builtin('subsref',L_tilde,Idx);
Error in Carbon90 (line 29)
  1 Comment
Ryan
Ryan on 27 Sep 2022
u_f and other functions are defined above I just did not include them.

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Answers (1)

Image Analyst
Image Analyst on 27 Sep 2022
diff(n_stress,t) is a vector. It does not have a u_c field. Perhaps you meant
diff(n_stress,t) .* u_c

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