string to sym error

I have the string

>> d='1/m'

>> class(d)

char

>> p=sym(d)

I get:

Warning: Support of strings that are not valid variable names or define a number will be removed in a future relase. To create symbolic expressions, firs create symbolic variables and then use operations on them.

after that p is empty

I tried syms m; at the beginning but i get the same error

Answer 1

[Mischa Kim]

Alberto, the functionality you are using will be removed in future releases, but you can still use it. That is why you are getting a warning message (not an error message).

Instead use,

 syms m 
 p = 1/m

[Richard Wang]

but if I do need to convert a string to symbolic expression, how can I realize it, since this sym() function will no longer in use?

For example, I want to type in an expression by keyboard input and I want to treat this expression as symbolic function or other.

[Karan Gill]

You can use "eval" on the string input.