>> phi Warning: Support of character vectors will be removed in a future release. Character vectors can be used only for variable names and numbers. Instead, to create symbolic expressions first create symbolic variables using 'syms'. To evaluate character vectors and strings representing symbolic expressions, use 'str2sym'. > In sym>convertExpression (line 1581) In sym>convertChar (line 1486) In sym>tomupad (line 1236) In sym (line 215) In phi (line 3) ans = (2^(2/3)*(29 - 3*93^(1/2))^(1/3))/6 + (2^(2/3)*(3*93^(1/2) + 29)^(1/3))/6 + 1/3