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It is difficult to understand why you are having a problem (unless you really found a flaw in LabVIEW 2015). To help us figure out what is going on, please attach:
the VI that you are using to plot the MatLab data (attach the VI directly);
the Matlab data (it's not clear if you have 3 1x102 arrays, or one 3x102 array ...)
If you have too many files to attach, put them in a folder, compress the folder, and attach the ZIP file. Note that if you have multiple files in a Project, this is an excellent way to attach the entire Project.