What is wrong with: [betta;delta;gamma]=inv([ab ab_cd -cd])*[C-A];
조회 수: 1 (최근 30일)
이전 댓글 표시
Hi
[betta;delta;gamma]=inv([ab ab_cd -cd])*[C-A];
betta, delta and gamma should be scalars.
ab, ab_cd, cd, C and A are column vectors with 3 rows (e.g. [1;2;3]).
I want that
betta = leftvektor(1)
delta = leftvektor(2)
gamma = leftvektor(3)
Matlab shows an error but I am not sure why. Does anyone knows why?
댓글 수: 0
채택된 답변
Bruno Luong
2018년 10월 30일
편집: Bruno Luong
2018년 10월 30일
You cannot capture elements of array on the lhs directly to variables, you have to split it:
x = inv([ab ab_cd -cd])*[C-A];
betta = x(1); % beta is better me think
delta = x(2);
gamma = x(3);
댓글 수: 0
추가 답변 (1개)
John D'Errico
2018년 10월 30일
편집: John D'Errico
2018년 10월 30일
Why? This is because what you want to do is not valid in MATLAB. You can want for anything. If wishes were horses, beggars would ride.
You cannot split a result as a vector into multiple arguments.
Can you solve the problem? Well, yes. Sigh. Write a little helper function that will take a vector, and automatically split it into scalars.
function varargout = split2scalars(Vec)
% splits a vector of length n into n scalars
n = numel(Vec);
varargout = mat2cell(Vec(:),ones(n,1),1);
So ...
[Vx,Vy,Vz] = split2scalars(1:3)
Vx =
1
Vy =
2
Vz =
3
Use it as:
[betta;delta;gamma] = split2scalars(inv([ab ab_cd -cd])*[C-A]);
댓글 수: 0
참고 항목
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!