Rounding set of number to closest number in array

Question

Damir Kadyrzhan 2020-10-9

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https://ww2.mathworks.cn/matlabcentral/answers/609256-rounding-set-of-number-to-closest-number-in-array

评论： Ameer Hamza 2020-10-9

This is the data I need to round up to. Basically, each number from x_n I need them to get rounded up to closest number in yaxis array.

Y = round(x_n, yaxis) I have tried using this command but it says "The second input must be a real integer scalar." Then I have tried making a for loop putting each data separately, but I am struggling on what command to use to round it up to closest number from an array.

yaxis = [-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.60 0.8 1]

x_n = 0 0.5878 0.9511 0.9511 0.5878 0.0000 -0.5878 -0.9511 -0.9511 -0.5878 -0.0000

0.5878 0.9511 0.9511 0.5878 0.0000 -0.5878 -0.9511 -0.9511 -0.5878

Thank you for the help.

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Answer 1

Ameer Hamza 2020-10-9

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https://ww2.mathworks.cn/matlabcentral/answers/609256-rounding-set-of-number-to-closest-number-in-array#answer_509646

编辑：Ameer Hamza 2020-10-9

在 MATLAB Online 中打开

Following shows a general approach

yaxis = [-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.60 0.8 1];
x = [0    0.5878    0.9511    0.9511    0.5878    0.0000   -0.5878   -0.9511   -0.9511   -0.5878   -0.0000 0.5878    0.9511    0.9511    0.5878    0.0000   -0.5878   -0.9511   -0.9511   -0.5878];
[~, idx] = min(abs(x-yaxis.'));
x_rounded = yaxis(idx)

Since yaxis vector is regular, there might be a more efficient approach.

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Ameer Hamza 2020-10-9

idx is the index number. It tells which element number in 'yaxis' is closest to the corresponding element in 'x'. You can run both lines one by one and see the output. It will help in understanding the code.