On Tue, Jun 17, 2008 at 02:28:46PM +0000, Michael Fothergill wrote: > > Dear Folks, > > I have now got grace6 installed and running. > > I have been poking around with it and looking at the documentation. > > I have a dumb question. > > It's supposed to be an XY type plotting program (I think any way). > > So, how do you input a set of coordinates into it and plot them? > > There are lots of ways of fiddling with the axes and putting labels on things > etc but I can't figure out where to put data into it..... > > In the data menu there is an import option. If you click on this then you > get a menu that looks as though it might read a data file of some kind....... > > Could I create a file in e.g. emacs and put the following coordinates it: > > (1,1) > (2,2) > (3,3) > (4,4) > (5,5) > > and get it to read it in as coord.dat or something like that? > > If you plotted this line it would be a straight line with a gradient of 1 > going through the origin in a simple XY 2-D coordinate system. > > What is the magic secret to inputting these data points into grace and > plotting them? > > I also have a more difficult question. > > Let's suppose I have a set of coordinates, say ten points in all. But, in > this case they don't produce a straight line when you plot them...... > > The initial part is a straight line pretty much, but then the points veer > away to the right on a simple XY coordinate system and gradually bend towards > a horizontal straight line.... > > > It's rather like starting with the first three points above (1,1), (2,2) and > (3,3). They would be on a straight line with a gradient of 1. But now lets > imagine the next seven points make the gradient fall gradually to zero > (straight line)..... > > > The last three points could end up being some thing like (7,7), (9,7) and > (11,7). This should be a straight line which is horizontal (gradient zero) > and lives on the y=7 coordinate. > > This would be called a rectangular hyperbola by people like Gil Grissom or > whatever his name is on CSI..... > > What I want to do is collect some data that will form a rectangular hyperbola > and plot them in grace and then e.g. print it out and fit by eye a straight > line to the first few points near the origin to get the gradient at the start > of the curve (the (1,1), (2,2) and (3,3) bit of it). > > Smarter than this would be a clever dick software that actually > mathematically fit and drew the best fitting straight line through the early > part of the hyperbola to get the gradient at the start of the curve...... > > This is not necessary, but a plot that I could print out and draw the > straight line on by hand would be pretty good. > > I could figure out the gradient from the XY coordinates on the printed graph > pretty easily. > > Suggestions welcome on this. > > If you think another piece of software might fit the bill other than grace I > would appreciate a hint.
I have always just used gnuplot for doing graphs and such. I hadn't even heard of race before. -- Len Sorensen -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
