How can I express a symbolic variable in function of other symbolic variables,

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XAXRXTX
XAXRXTX 2013-11-25
评论： Walter Roberson 2013-12-1
hello
is there a predefined function in matlab that can express a symbolic variable depending on other symbolic variables, for example
syms x y z
z=x^2+y^3;
x=f(y,z)=?????????????????
what is a function that allows to write x in terms of y and z
thanks in advance
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Sean de Wolski
Sean de Wolski 2013-11-25
Like a function in a separate file that takes in x and y or like your expression for z which could be rewritten as
z = @(x,y)x^2+y^2;
Then to use:
z(x,y)

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采纳的回答

Walter Roberson
Walter Roberson 2013-11-25
With newer MATLAB versions, you can use
syms f(y,z)
f(y,z) = x^2+y^3;
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XAXRXTX
XAXRXTX 2013-11-30
编辑：XAXRXTX 2013-11-30
thanks walter, it works but you must add a quotes
syms x y z
X = solve('z = x^2+y^3', x);

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Andrei Bobrov
Andrei Bobrov 2013-11-29
编辑：Andrei Bobrov 2013-11-29
syms x y z
xfun = matlabFunction(solve(x^2+y^3 == z,x))
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XAXRXTX
XAXRXTX 2013-11-30
thanks again andrei, but you must add a quotes and eliminate =
syms x y z
xfun = matlabFunction(solve('x^2+y^3 = z',x))

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