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

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Sara Nikdel
Sara Nikdel 2022-8-26
评论： Sara Nikdel 2022-8-29
Ran in:
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?

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回答（1 个）

Michael
Michael 2022-8-26
Ran in:
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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