'Matrix dimensions must agree' error
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i have this code and it says that the matrix dimensions must agree. What am i doing wrong? I'm really new in matlab.
Re = 190000:10000:290000;
Pr = 3.66:0.5:5.66;
Pr = double(Pr);
Nu = [(0.3+0.62.*Re.^(1/2).*Pr.^(1/3))/(1+(0.4/Pr).^(2/3)).^(1/4)].*(1+(Re/282000))
回答 (1 件)
Star Strider
2020 年 11 月 14 日
Vectorise all multiplication, division and exponentiation operations, and it works:
Re = 190000:10000:290000;
Pr = 3.66:0.5:5.66;
[Rem,Prm] = ndgrid(Re, Pr);
Nu = @(Re,Pr) ((0.3+0.62.*Re.^(1/2).*Pr.^(1/3))./(1+(0.4./Pr).^(2/3)).^(1/4)).*(1+(Re/282000))
figure
surf(Rem, Prm, Nu(Rem,Prm))
grid on
.
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