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

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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?

Answers (1)

Michael
Michael on 26 Aug 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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