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How do I plot the average and standard deviation of a specific variable of a file within several excel files?

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Jonathan Bijman
Jonathan Bijman on 31 May 2019
Commented: Walter Roberson on 1 Jun 2019
Dear Community
Please help me with guidance.
I have a folder with many excel files and I found a way to load all that files in Matlab and read them.
The point is that, besides to load all these files, now I have to get plots where it shows the average and standard deviation of these measurements.
Inside of each folder, there are 9 measurements, where appears Voc (short circuit voltage), Isc, Pmmp, etc.
The objective is to plot the average of the 9 measurements, with the bars of standard deviation (Only Voc, for instance, that would be on Y axis) along the time (Like day 1, day 2, day 3, etc. on the X axis)
The last thing I couldn´t to make it. Please anyone help me with that, it´s a little complicated.
I send the script that I've made, and a picture of the example of the file.
Thanks a lot!
for i=1:t

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