How to combine multiple time spans in Matlab?

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.

Answer 1

[Harsh]

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.

[Peter Perkins]

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.