Help debugging a symbolic expression error

2016 10 19
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更新时间：2016 10 19
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I'm trying to create a symbolic expression but don't fully understand the error I get. Code and error below.
syms l t b
f(l,t,b)=l((t/b)-(sin((2*pi*t)/b)/(2*pi)));
And the error:
Error using sym/subsindex (line 737)
Invalid indexing or function definition. When defining a function, ensure that the arguments are symbolic
variables and the body of the function is a SYM expression. When indexing, the input must be numeric, logical,
or ':'.
Error in sym/subsref (line 776)
R_tilde = builtin('subsref',L_tilde,Idx);
I've tried making smaller expressions with syms variables and constants to eliminate the possibility that constants can't be used.

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 采纳的回答

Star Strider
Star Strider 2016-10-19

0 个投票

You’re missing a multiplication operator. MATLAB does not recognise implicit multiplication.
syms l t b
f(l,t,b) = l*((t/b)-(sin((2*pi*t)/b)/(2*pi)));
↑ ← INSERT ‘*’ HERE
That runs without error.

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