Hi Calabrese,
I understand that you are attempting to make a series of box plots over time with statistics of data (mean, minimum, maximum, and standard deviation) from Excel files. Unfortunately, this is not enough information to create a box plot. Box and whisker plots are produced from the entirety of the data, not just the statistics. The plot displays the median; the first and third quartiles; and the minimum and maximum values, ignoring outliers.
The MATLAB function that you would like to use here is "boxplot". This function takes in a data matrix X, where each column of data produces a box in the box plot. In order to be able to use "boxplot", you would need to provide all of the data collected for each date; then, the function would compute the appropriate statistics and display the corresponding boxes for each date.
I hope this helps.
Matt
