Calculation of distance automatically at height h and from point O for different curve

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Jenny Lee 2021-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/1609060-calculation-of-distance-automatically-at-height-h-and-from-point-o-for-different-curve

编辑： John Kelly 2021-12-29

Hi all,

I hope you are doing well in this pandemic. I am new at Matlab, and i would like to solve one problem, which i am thinks very difficult to solve with the Matlab. I have one formula which calculates the curve at different K value. I need to evaluate the value of X1 , X2, X3 , X4, , X5, and X6 at height "H" from point "O" automatically for further condition. How can i caculate automatically by algorithm and use those different X1 , X2, X3 , X4, , X5 and X6 value in further algorithm. (For explnation, You can see it in the picture and you willl understand it much better)

My mind is stopped working for this, so any ray of light from you guys will be highly appreciable.

Thanks a ton

Jenny Lee

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采纳的回答

Image Analyst 2021-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/1609060-calculation-of-distance-automatically-at-height-h-and-from-point-o-for-different-curve#answer_853175

在 MATLAB Online 中打开

Isn't it just

% Find the index where the curve, for some particular k value, first drops below -0.05.
index = find(kCurve < -0.05, 1, 'first');
% Use that index to get the x value where the curve first drops below -0.05.
xN = x(index);