How to combine multiple time spans in Matlab?

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Chamath Vithanawasam
评论： Peter Perkins 2018-8-3
I have data from multiple .txt files, each displaying temperature at different times throughout the day. Each .txt file is for one day. I want to combine all these dates and their respective recorded temperatures into one table, so that I can plot for a very large time duration, i.e. 3 months, etc.
Suppose I collect the data for 3 days.
Day1 = 'SI010218.log';
Day2 = 'SI020218.log';
Day3 = 'SI030218.log';
opts = detectImportOptions(Day1);
opts = setvartype(opts,1,'datetime');
opts = setvaropts(opts,1,'InputFormat','dd.MM.uuuu HH:mm:ss');
table1 = readtable(Day1,opts);
opts = detectImportOptions(Day2);
opts = setvartype(opts,1,'datetime');
opts = setvaropts(opts,1,'InputFormat','dd.MM.uuuu HH:mm:ss');
table2 = readtable(Day2,opts);
table2([1417],:) = [];
opts = detectImportOptions(Day3);
opts = setvartype(opts,1,'datetime');
opts = setvaropts(opts,1,'InputFormat','dd.MM.uuuu HH:mm:ss');
table3 = readtable(Day3,opts);
This creates 3 tables holding all the data from each of the .txt files. Column 1 holds the date and time, and column 8 holds the desired y-axis values. How do I add all the time values from column 1 into a separate table along with the y axis value placed in column 8? I am attaching the .txt files as well.

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采纳的回答

Harsh
Harsh 2018-7-27
Not sure what your end goal is but if you'd like to bring the variables of the table together, you can try the following in addition to your current code:
>> table1.Properties.VariableNames{'TimeStamp'} = 'TimeStamp_1';
>> table2.Properties.VariableNames{'TimeStamp'} = 'TimeStamp_2';
>> table3.Properties.VariableNames{'TimeStamp'} = 'TimeStamp_3';
>> tt = [table1(:,1), table2(:,1), table3(:,1)]; %variables next to each other
If you would like to stack data from multiple variables into single variable:
>> st = stack(tt,1:3);
This can be done with column 8 data (y-axis) as well and I suppose you could then plot the data.
  1 个评论
Peter Perkins
Peter Perkins 2018-8-3
Harsh's suggestion does a horizontal concatenation. I would have guess you'd have wanted a vertical concatenation. That's just vertcat, i.e.
t = [table1; table2; table3];
If that's where you want to end up, you probably should be using timetables, not tables.

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