Help debugging a symbolic expression error

10 次查看（过去 30 天）
Cameron
Cameron 2016-10-19
回答： Star Strider 2016-10-19
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.

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2016-10-19
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.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Assumptions 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by