解决变量

Question

我试图解决下面的等式x。

S = solve('1./sqrt(x-1)','x');

某种程度上根本不起作用。我还尝试了使用syms x

的方法

有没有一种简单的方法来解决这个问题？提前谢谢！

错误讯息：

Warning: Support of strings that are not valid variable names or define a
number will be removed in a future release. To create symbolic
expressions, first create symbolic variables and then use operations on
them. 
> In sym>convertExpression (line 1536)
  In sym>convertChar (line 1441)
  In sym>tomupad (line 1198)
  In sym (line 177)
  In solve>getEqns (line 405)
  In solve (line 225) 
Error using symengine
Invalid input. 'expression' is expected.

Error in sym>convertExpression (line 1543)
s = mupadmex({x});

Error in sym>convertChar (line 1441)
    s = convertExpression(x);

Error in sym>tomupad (line 1198)
        S = convertChar(x);

Error in sym (line 177)
                S.s = tomupad(x);

Error in solve>getEqns (line 405)
        a = sym(a);

Error in solve (line 225)
[eqns,vars,options] = getEqns(varargin{:});

Answer 1

使用正确的方式调用solve：

syms x real
S = solve((x-1)^-0.5 == 0, x);

按照此处的建议：http://www.mathworks.com/help/symbolic/solve.html

或者，甚至更简单：

x = 1;   % :-)

Answer 2

syms x y

solve('y = 1/(x-1)',x)