| Is it possible to add a label to each of my boxes? |
Yes, but only by using a function that creates text as another plot. Writing such a function would be a lot of work, but the e-book "Creating Amazing Images with Mathcad 14" fortunately has such functions. See here: https://www.ptcusercommunity.com/community/mathcad/mathcad-usage/blog/2010/05/27/creating-amazing-images-with-mathcad-14. You could copy the relevant functions (and the ones they depend on, of course) into a collapsible area in your worksheet.
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I would also like to change the y axis to a log scale but it's complaining that I have a non positive value in my dataset? Clearly from the data this shouldn't be the case.
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Zero is not a positive number, and, more specifically, log(0) is undefined.
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Lastly is it possible to look into the code behind the "boxplotgraph()" function, and modify it to do something different?
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No, but it probably wouldn't be that hard to create a function that plots boxes. How hard depends on exactly what you want to do.Depending on exactly what you want, it may even be possible to just augment the existing output of the boxplotgraph function. As an example of using functions to create a custom plot type (which of course is also what boxplotgraph does), I have attached a worksheet with functions that can be used to plot error bars on both the x and y axes.
