Calculation of a column

Question

Ke Yeun Yong 2023-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/2023207-calculation-of-a-column

评论： Voss 2023-9-19

Hi,

I have a column with 53 rows of different numbers. I only want to do formula calculation until the 45th row and the remaining 8 rows I want to make them the same value. All the results will be compile in the same column. May I know how that can be done?

With Altitude having the column (53 rows of number),

To = 288.15; % Temperature in ISA [K]

for i = 1:53

Ta (i) = To-0.0065*Altitude(i); % Temperature at altitude [K]

end

From above code, how do I make the calculation stop at 45th row and the remaining 8 rows will have the value of 216.65? and all new 53 rows of values will be under 1 column?

Thank you very much.

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Answer 1

Voss 2023-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/2023207-calculation-of-a-column#answer_1313502

在 MATLAB Online 中打开

To = 288.15; % Temperature in ISA [K]
% pre-allocate Ta to be the same size as Altitude (53x1), with all elements 216.65
Ta = 216.65*ones(size(Altitude));
% calculate the first 45 elements of Ta:
Ta(1:45) = To-0.0065*Altitude(1:45); % Temperature at altitude [K]

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Ke Yeun Yong 2023-9-19

Hi,

CDO = 0.023; % Zero-lift drag coefficient

K = 0.044; % Lift-induced drag factor

MTOW = 79010; % Maximum take-off mass [kg]

W = MTOW*9.81; % Weight in N

A= Thrust_22K/W;

B = sqrt((A.^2)+(12*CDO*K));

Cl = (6*CDO)/(A+B)

Thrust_22K is a column with 53 rows and I am trying to calculate for Cl as above but the results on shows the first row result and the rest is zero. May I know what have i did wrong?

Thank you very much.