Finding value for each degree from matlab figure

Question

helin özdemir 2024-5-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2115161-finding-value-for-each-degree-from-matlab-figure

编辑： Voss 2024-5-5

Naca LD1408 9R.txt

After running the values I obtained from a NACA profile in Matlab along with the txt file, I perform the smoothing process. I am trying to find equivalents at every level for the figure in the appendix. How can I do it

This is the command I run for the figure I obtained:

[Alfa2D, cl2D, ~, ~]= textread('Naca LD1408 9R.txt','%f %f %f %f');

N2D = size(Alfa2D,1);

%--------------------------------------------------------------------------

% Fit a Smoothing Spline Model

%--------------------------------------------------------------------------

f = fit(Alfa2D, cl2D,'smoothingspline','SmoothingParam',0.3)

f =

Smoothing spline: f(x) = piecewise polynomial computed from p Coefficients: p = coefficient structure

figure(1); plot(f,Alfa2D,cl2D)

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Walter Roberson 2024-5-5

I am trying to find equivalents at every level for the figure in the appendix.

Could you explain that more?

helin özdemir 2024-5-5

Naca LD1408 9R.txt

Hello, the Naca LD1408 9R.txt file that I used to obtain the figure is at the top of the post. The data I want to obtain is the red (fitted curve) line in the figure file. I want to obtain the values of the fitted curve line at 1 degree or 0.5 degree intervals. For example, it starts from -15 x= -15 y=0.75 x=-14 y= 0.80. Is there a command that will do this automatically and correctly?

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