Index of the row

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Imner Renmi 2016-7-8

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评论： Star Strider 2016-7-8

Hi,

I have a 5000 by 1 vector and I have a scalar, which is NOT part of the vector. I want to find the row number of the closest value to the scalar in the vector. The vector contains both positive and negative numbers and the scalar can be positive and negative too.

Anyone an idea of how to code this in Matlab.

Many thanks

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Answer 1

Azzi Abdelmalek 2016-7-8

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编辑：Azzi Abdelmalek 2016-7-8

在 MATLAB Online 中打开

[~,idx]=min(abs(your_vector-threshold))

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Imner Renmi 2016-7-8

Just to be sure, it will also work well for the negative values right?

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Answer 2

Star Strider 2016-7-8

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在 MATLAB Online 中打开

This workd:

vector = randi([-99,99], 100, 1);                       % Create Data
scalar = 100*(rand-0.5);                                % Create Data
[vs,idx] = sort(vector);                                % Sort
q = find(vs <= scalar, 1, 'last');                      % Find Lowest Close Value
[q2,ixm] = min(vs([q, q+1]));                           % Mininmum Distance
nearest = vs(q+ixm-1)                                   % Result

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Imner Renmi 2016-7-8

What are 'vs' and 'idx'?

Star Strider 2016-7-8

在 MATLAB Online 中打开

The ‘vs’ array is the sorted ‘vector’. The ‘idx’ vector are the original indices of the elements of the sorted vector. If you want the index instead of the value for ‘nearest’, that assignment becomes:

nearest_idx = idx(q+ixm-1)

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