Wanting to analyze only data taken from days at night from a matrix of data from roughly a week

2 次查看（过去 30 天）

Samantha Wallace 2018-7-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/410127-wanting-to-analyze-only-data-taken-from-days-at-night-from-a-matrix-of-data-from-roughly-a-week

评论： Samantha Wallace 2018-7-12

I have approximately a weeks worth of data (column 1 is date/time data in 30 second epochs and column two is the corresponding integer value for the date/time). I want to keep the entire data set (specifically date/time) for plotting purposes later on, but I only want to analyze the data in a function from 7pm to 10am on each day. Any recommendations on how to do this?

4 个评论
显示 2更早的评论隐藏 2更早的评论

Rik 2018-7-12

What code have you tried?

Samantha Wallace 2018-7-12

在 MATLAB Online 中打开

I've tried many codes but in general the code below follows the format I've been trying most I think. It's pretty messy but I'm just stuck in a rut of how to make this work the way I am needing it to.

idx = strcmp(DT3_30str,{'19:00:15'});
[timeidx_7pm,~] = find(idx == 1);
idx = strcmp(DT3_30str,{'10:00:15'});
[timeidx_10am,~] = find(idx == 1);
for ii = 1:size(timeidx_7pm)
    if Sampledata(timeidx_7pm(ii):timeidx_10am(ii))
       Sampledata(ii,2) = Sampledata(ii,2);
    else
       Sampledata(ii,2) = {'DayTime'};  % or equal to rally anything as a place holder so I can still have the datetime value for plotting later
    end
end