How to pick five data points equally above and below ( five above and five below)

Question

Mekala balaji 2017-9-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/356699-how-to-pick-five-data-points-equally-above-and-below-five-above-and-five-below

回答： Pal Szabo 2017-9-14

Hi,

I have below data:

2
5
7
9
9
3
9
0
0
5
8
Given point is 5.9

I want to select Five points above and Five points below 5.9. But here, there are only 4 points above 5.9, so in this case select 4 points above and 4 points below (that is minimum data count above and below equally because five data above and below not exist).

So, my desired out put is:

So, I need help:

1. If 5 data points not available, then select the next minimum data points (above & below equally). If suppose for example given data point is 10, then there are only two data points (10.5 &11.8) exist below 10 (although there are five data points available above 10) Therefore select two data point above and below (i.e.,data points above 10 are: 7.9 & 8, below are:10.5 & 11.8)

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Answer 1

Pal Szabo 2017-9-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/356699-how-to-pick-five-data-points-equally-above-and-below-five-above-and-five-below#answer_281560

I believe this works:

 data = [1.2;3.5;4.7;4.9;5.9;6.3;7.9;8.0;10.0;10.5;11.8]
 givenpoint = 5.9
 data_less_than_givenpoint=data(data<givenpoint)
 data_greater_than_givenpoint=data(givenpoint<data)
 indexofgivenpoint=find(data==givenpoint)
 if (length(data_less_than_givenpoint)>5 && length(data_greater_than_givenpoint)>5)
   desiredoutput=data((indexofgivenpoint-5):(indexofgivenpoint+5)) 
 else
   datapointsavailable = min([length(data_less_than_givenpoint)  length(data_greater_than_givenpoint)])
   desiredoutput=data((indexofgivenpoint-datapointsavailable): (indexofgivenpoint+datapointsavailable))
 end