Variable Set by Non-scalar Properator??

Question

Kevin 2014-7-30

0
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https://ww2.mathworks.cn/matlabcentral/answers/144070-variable-set-by-non-scalar-properator

回答： Star Strider 2014-7-30

Hi,

In my Matlab code I am using the following equations:

if axial_induction<0.4;
C_T=(sigma_local .* ((1-axial_induction).^2) .* ((Cl.*cos(relative_wind))+(Cd.*sin(relative_wind)))) ./ ((sin(relative_wind)).^2); 
else
    C_T=(8/9).*(4.*F-(40/9)).*axial_induction+((50/9)-4.*F).*(axial_induction.^2);
end

axial_induction is a 9x1 array of values. However I am getting an error stating that the variable 'axial_induction' might be set by a non-scalar operator. Can anybody please help me?

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Answer 1

Star Strider 2014-7-30

1
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I’m not familiar with that error (never encountered it as you describe) but this might be what you want:

for k1 = 1:length(axial_induction)
    if axial_induction(k1)<0.4;
        C_T(k1)=(sigma_local .* ((1-axial_induction(k1)).^2) .* ((Cl.*cos(relative_wind))+(Cd.*sin(relative_wind)))) ./ ((sin(relative_wind)).^2); 
else
        C_T(k1)=(8/9).*(4.*F-(40/9)).*axial_induction(k1)+((50/9)-4.*F).*(axial_induction(k1).^2);
    end
end