ebbnflow - apologies for not thanking you earlier for posting the link to qudata. Thank you. I have definitely saved it for my "favorite links" for studying more later but as far as drawing a graph, I was unable to get it to do anything but to plot individual points such as TSP I-Fund share prices (Y) vs an integer value corresponding to date (X). Wouldn't connect the points so was just a splatter of points.
Since qudata sells some other products, I wonder if this isn't a very low-scale utility just to draw you in. Anyway, will explore some later. But also in the meantime, I am looking into Excel as ChemEng suggested. Seems like a lot of references to this on the web - i.e. using Excel for plotting.
sponsor, not sure if I can explain a 2d plot. Basically a graph with x values (usually horizontal) vs y values (usually on vertical axis). I had hoped to do some variation of a moving average plot of stock prices but looks like qudata doesn't allow you to compose an equation for y that is an average of numerous values of x.
As far as how I entered the data, I was able to enter the values for the TSP I Fund stock prices from the share price page at:
http://www.tsp.gov/rates/share-prices.html. I cut and pasted 30 days into Excel. Couldn't see a way to just cut one column of I-Fund prices.
Then from Excel, I was able to cut just the column of I-Fund prices only (not c-fund, s-fund, etc.).
sponsor, if you need an explantion of a 2d plot, I think there are text books with sections on this. I don't think I could explain this very well here, any more than my statements above.
Hope this helps a little.