How do I resize multiple arrays that are read in from large csv files of different sizes?

I am constantly reviewing data measurements from three devices and each time I extract data, they are usually different in size. In order to do Matrix calculations, my arrays all have to be the same size (e.g. 10 Rows x 20 Columns). Each array has Column 1 designated as Source Time which is typically time sampled at 1 second intervals. What would be the most efficient way to implement code to resize each of the arrays to the size of the largest array while not sacrificing the accuracy of the data? Once resized, the time codes all have to be the same or within 97% accuracy to ensure matrix calculations are consistent between each data array. What I mean by this is once resized, I don't want to compare data at 30 second instance of one device with data at 29 second instance of another device.

[Guillaume]

Sounds like instead of resizing you mean resampling to a common time base, assuming the samples all cover the same time duration?

[John BG]

Hi Thomas

this is John BG <mailto:[e-mail] [e-mail]>

Thomas please, would you be so kind to attach the data so readers don't have to guess it?

It hasn't got to be real data, but something that resembles the data you want processed in the way you are asking in this question.

[Thomas Gunther]

Hi John,

I attached 3 representative files that are similar to the data I receive. The time sampling is 1 second intervals for about 10 minutes recording. Hope this helps.

[Stephen23]

Thomas Gunther's "Answer" moved here:

The start and stop times of data may be at different time sequences based on when equipment was turned on and recording started. So if all 3 devices aren't turned on at the same time and data recording starts at power on, then data files will not be equal in size. So adjusting the time sampling to a common time base between all 3 may be the right solution, but I am a novice at MATLAB and don't know how to perform that process. Any helpful hints would be greatly appreciated. Thanks.

[Stephen23]

@Thomas Gunther: PDFs are useless for transferring data, because the PDF standard defines only the visual layout of how it looks in a viewer, but nothing about the sequence of data stored in the file itself. In general it is very difficult to extract data from them. Read these to know more:

https://www.mathworks.com/matlabcentral/answers/229174-extracting-the-text-from-pdf-file

https://www.mathworks.com/matlabcentral/answers/155500-how-to-extract-data-from-pdf-file-in-matlab

etc.

Please provide the actual data files.

[Thomas Gunther]

Here are the csv files that were read into my program. Will these work?