Find neighboring values of a target value in array

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Georg Söllinger 2016-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/302814-find-neighboring-values-of-a-target-value-in-array

评论： Walter Roberson 2016-9-13

Hi everybody,

I have a matrix, whose values represent the points of geometry-changes of a specific 3D geometry (mainly sorts of angularly aligned cuboids) in intervals. What I want to do is: enter a height, in which the geometry is analyzed. Afterwards, the 2D geometry in the user defined height is processed.

With my knowledge, I would achieve the solution with a combination of for-loop (heigth-direction entities of the matrix) and some if-conditions, but I am sure, there exists a more elegant solution for my problem.

Is there any function, which finds the two height-value neighbors in the matrix entities? Then, the interpolation part is not a problem any more.

Can anyone help me? Thanks in advance!

Best wishes, Georg

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Answer 1

Walter Roberson 2016-9-13

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https://ww2.mathworks.cn/matlabcentral/answers/302814-find-neighboring-values-of-a-target-value-in-array#answer_234554

Depending on how your values are represented, slice() might be what you need.

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Georg Söllinger 2016-9-13

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Hello Mr. Roberson,

Thanks for your reply! Actually, this function is not really what I need. I have z-Values arranged in an array together with x and y values, e.g.:

z = [7.200;16.715;36.245]
x = [...;...;...]
y = [...;...;...]

and e.g. a desired height of 30 -> the neighboring values in the array are 16.715 & 36.245. The function should either return the values or their array index.