Why do I receive this error while using a MATLAB help example?

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Sara Nikdel
Sara Nikdel le 26 Août 2022
Commenté : Sara Nikdel le 29 Août 2022
I am trying to do something similar to this MATLAB example that is provided in Help:
syms x y z
S = struct('f1',x*y,'f2',y + z,'f3',y^2)
S = struct with fields:
f1: x*y f2: y + z f3: y^2
Sval = subs(S,[x y z],[0.5 1 1.5])
Sval = struct with fields:
f1: 1/2 f2: 5/2 f3: 1
but I get this error:
"Error using subs
Expected input number 1, S, to be one of these types:
sym
Instead its type was struct.
Error in sym/subs (line 60)
validateattributes(F, {'sym'}, {}, 'subs', 'S', 1);"
What went wrong?
  2 commentaires
Torsten
Torsten le 26 Août 2022
Modifié(e) : Torsten le 26 Août 2022
Seems your MATLAB version is an old one (see above).
Sara Nikdel
Sara Nikdel le 29 Août 2022
I updated my MATLAB and it works now, thank you.

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Réponses (1)

Michael
Michael le 26 Août 2022
This ran fine on my machine. See below. What version of Matlab are you using? Maybe an older version that doesn't support struct inputs?
syms x y z
S = struct('f1',x*y,'f2',y + z,'f3',y^2)
S = struct with fields:
f1: x*y f2: y + z f3: y^2
Sval = subs(S,[x y z],[0.5 1 1.5])
Sval = struct with fields:
f1: 1/2 f2: 5/2 f3: 1

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