if 구문에서 데이터값이 계산한 값과 다르게 나옵니다.

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GeonWoo Jeon
GeonWoo Jeon on 27 Sep 2019
Answered: SaiDileep Kola on 25 Mar 2021
v = 0.1 : 0.1 : 2
re = (mediandiamter * 10^-6 * v * fdensity ) / vicosity ;
if ( re < 2.0 )
cd = 24 * (re.^(-1))
elseif ( 2<= re <= 500 )
cd = 19 * (re.^-(0.6))
else
cd = 0.4 * (re.^(-0))
end
여기서 fdensity, vicosity, mediandiamter는 상수며 첫번째 re값이 0.5996 이 나왔습니다.
그렇게되면 첫번째 cd값은 re가 2보다 작으므로 24 * 0.5996^-1 의 결과인 40.0266이 나와야되는데 매트랩상에서는 25.9가 찍힙니다.
어디부분이 잘못된걸까요 ??

Answers (1)

SaiDileep Kola
SaiDileep Kola on 25 Mar 2021
I don't see anything wrong in the posted code, may be the values of other constant parameters or using re as vector and element might be problem try using index like re(i).

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