Error of sym>convertChar

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Kutlu Yigitturk
Kutlu Yigitturk 2021-4-20
评论： Kutlu Yigitturk 2021-4-20
How can I solve this problem? Thanks a lot.

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Stephan
Stephan 2021-4-20
编辑：Stephan 2021-4-20
Ran in:
syms a b c x
f = str2sym('a*x^2 + b*x + c')
f = 
subs(f,x,5)
ans = 
subs(f,[x a b c],[5 1 2 3])
ans = 
38
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Steven Lord
Steven Lord 2021-4-20
Ran in:
Alternately since all the symbolic variables have been defined on the first line:
syms a b c x
f = a*x^2+b*x+c
f = 
subs(f, x, 5)
ans = 

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