# solving equation written in the functions

조회 수: 1 (최근 30일)
Vijay Shankar Dwivedi 2020년 10월 28일
편집: Aman Vyas 2020년 11월 3일
I want to solve three equations with three unknowns.
Force_x(x,y,z) == 0, Force_y(x,y,z) == 0, Force_z(x,y,z) == 0
vpasolve is not working here because Force_x works only when x y z are numbers, while vpasolve is passing symbols.
Help me with any other method or any modification.
my code:
[XX, YY] = vpasolve([Force_x(x,y,z)==0, Force_y(x,y,z)==0, Force_z(x,y,z)==0], [x, y, z], [0, 0, 0]);
error: Invalid arguments specified in evaluating the interpolant.
this error is due to symbols passed by Force_x.
##### 댓글 수: 2없음 표시없음 숨기기
KSSV 2020년 10월 28일
There should be some relation involving x,y,z right? Simply F_x = 0 ...will not work.
Vijay Shankar Dwivedi 2020년 10월 28일
편집: Vijay Shankar Dwivedi 2020년 10월 28일
Force_x(x,y,z) is a function defined in anothe file which involves x, y, z.

댓글을 달려면 로그인하십시오.

### 채택된 답변

Aman Vyas 2020년 11월 3일
편집: Aman Vyas 2020년 11월 3일
Hi,
You can try following code:
syms x y z Force_x Force_y Force_z
[X Y Z] = vpasolve([Force_x==0,Force_y==0,Force_z ==0],[x y z],[0 0 0])
This would start produce generic output as shown :
X =
Empty sym: 0-by-1
Y =
Empty sym: 0-by-1
Z =
Empty sym: 0-by-1
See this if it matches the requirement in output. Once you start calling function Force_x and other two then it should start outputting correct value.
Hope it helps !

댓글을 달려면 로그인하십시오.

### 카테고리

Help CenterFile Exchange에서 Conversion Between Symbolic and Numeric에 대해 자세히 알아보기

R2019b

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by