# matlab giving complex number when the expected answer is a real number?

조회 수: 1 (최근 30일)
Sei Him Cheong 2018년 5월 24일
댓글: Stephen23 2018년 5월 24일
matlab is giving me complex number when the expected answer is a real number? The code is the following:
A1 = -1;
A = A1^1.5
A = 0.0000 - 1.0000i
The answer should have been -1
A = -1^1.5
A = -1
Can anyone tell me why this is the case? It is giving a complex number when a variable is used.
Many thanks
##### 댓글 수: 1이전 댓글 -1개 표시이전 댓글 -1개 숨기기
Stephen23 2018년 5월 24일
"Can anyone tell me why this is the case?"
Because unary negation has a lower priority than the power operation. You can check this yourself:

댓글을 달려면 로그인하십시오.

### 채택된 답변

Mischa Kim 2018년 5월 24일
Note:
>> (-1)^1.5
ans =
0.0000 - 1.0000i
which is not the same as
>> -1^1.5 % = -(1^1.5)
ans =
-1

댓글을 달려면 로그인하십시오.

### 카테고리

Help CenterFile Exchange에서 Logical에 대해 자세히 알아보기

### Community Treasure Hunt

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

Start Hunting!

Translated by