How to convert different variables into one unified variable in a function?
显示 更早的评论
Hello I'm a newbie with matlab. Thanks for reading this post.
So I have function f (x,y,z,r) = (x^2 + y^2 +2z)*r
Then I also have z = (x^2+y^2) +2
and r = sqrt(x^2+y^2)
So how do I convert them all into r ? So that my new function f( r ) only have one variable r
f( r ) = (3*r^2 +4)*r
Thank you so much for taking time skimming through this post.
采纳的回答
Walter Roberson
2020-9-12
syms x y z r
z = (x^2+y^2) +2
fxyz = (x^2 + y^2 +2*z)*r %uses definition of z in terms of x y
eqn = r == sqrt(x^2+y^2)
rx = solve(eqn, x) %define x in terms of r
fr = simplify(subs(fxyz, x, rx)) %substitute definition of x. Simplify
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Logical 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
