Hi David! I can answer you a small question, for the others maybe some big shots are available :-) > From the documentation and examples, it sounds like it should be > easy to zoom in on the y-axis of a TH1F or TGraph by clicking the left > mouse button and dragging along the y-axis. I do this and a box is drawn > around the y region as it for a successful zoom in on the x-axis -- however, > after I release the mouse button, the box just disappears and nothing > else happens. (I'm using ROOT version 2.23/12 1 February 2000 under RH > Linux 6.1.) Do I have to do something special to zoom in on the y-axis? One can not "zoom" the y axis of a 1D histogram, because this is not really a binned axis, it only shows the number of entries in the bins on the __X-axis__. The "box" probably pops up, because a 2d histogram has this feature ... You can change your scope in y axis (something like "zoom") by giving the histogram a Minumum and/or a Maximum. Two possibilities: interactively by clicking on the histogram curve and you the functions SetMaximum/SetMinimum or via commandline myHisto->SetMaximum(100) Have fun, Michael > Sorry for the unrelated sequence of questions. Thank you for your > patience. > > David >
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