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From: Andre Wobst <wobsta@us...>  20040122 21:04:16

Hi, I've just uploaded PyX 0.5.1. It fixes a distribution bug (the c files for the optional extension modules were missing in PyX 0.5) and a small PostScript DSC bug (unpaired Begin/End in fontreencoding). André  by _ _ _ Dr. André Wobst / \ \ / ) wobsta@..., http://www.wobsta.de/ / _ \ \/\/ / PyX  High quality PostScript figures with Python & TeX (_/ \_)_/\_/ visit http://pyx.sourceforge.net/ 
From: Sudheer Phani <bpsu@it...>  20040122 12:58:08

Hi Michael I some how could nt the graph i wanted to. Well abt the stem function in the matlab. eg y = x*x for x in the range (0,5) we have y = [0,1,4,9,16] when i stem(y) in matlab ... we get a graph some thing like this !!! ^ Y     a    x    i     s           > 0 1 2 3 4 Xaxis > where the height of each line corresponds to the value of y i.e. (0,1,4,9,16) for x = [0,1,2,3,4] regds Sudheer > Hello Sudheer, > > On 21.01.04, Sudheer Phani wrote: > > If I use graph.line() option then all these 5 points are joined with > > a line. > > > > If i were to draw the same graph something like in stem in Matlab... > > how would i do it using PYX > > > > in stem function for each of 5 points to xaxis for e.g from > > point(1,4) a line is drawn from (1,4) to (1,0) on xaxis like wise > > for the rest of the points > > I fear that there is no readymade solution to your problem yet. You > can use the following workaround, which is only a small extension to > the minimal example: > > ######## python code ########################### > # read x, y values from your datafile > d = data.datafile("minimal.dat") > > # extract the x and y values separately > xvals = d.getcolumn(1) > yvals = d.getcolumn(2) > > # plot the top line of your data with a line > # (or with symbols, if you like) > g = graph(width=8) > g.plot(graph.data(d, x=1, y=2), style=graph.line()) > > # finish the graph so that all axes are fixed > g.finish() > > # now comes the workaround: you can draw lines on the graphcanvas > # directly. Use g.pos() for accessing the datacoordinate system: > for x,y in zip(xvals,yvals): > g.stroke(path.line(g.pos(x,y)[0], g.pos(x,y)[1], > g.pos(x,0)[0], g.pos(x,0)[1])) > > g.writetofile("minimal") > ################################################ > > I hope this answers your question, unfortunately I do not know what > the "stem" function in Matlab is ... > > Best greetings, > Michael. > > 
From: Andre Wobst <wobsta@us...>  20040122 08:24:20

Hi, On 21.01.04, Michael Schindler wrote: > ######## python code ########################### > # read x, y values from your datafile > d = data.datafile("minimal.dat") > > # extract the x and y values separately > xvals = d.getcolumn(1) > yvals = d.getcolumn(2) > > # plot the top line of your data with a line > # (or with symbols, if you like) > g = graph(width=8) > g.plot(graph.data(d, x=1, y=2), style=graph.line()) > > # finish the graph so that all axes are fixed > g.finish() > > # now comes the workaround: you can draw lines on the graphcanvas > # directly. Use g.pos() for accessing the datacoordinate system: > for x,y in zip(xvals,yvals): > g.stroke(path.line(g.pos(x,y)[0], g.pos(x,y)[1], > g.pos(x,0)[0], g.pos(x,0)[1])) > > g.writetofile("minimal") > ################################################ Some additional notes: 1) You even may want to skip the g.plot(...) completely. Then the graph will not know about the axis ranges, so you have to provide axes with fixed ranges in the graph constructor. This would look like: g = graph.graphxy(width=8, x=graph.linaxis(min=0, max=10), y=graph.linaxis(min=0, max=10)) 2) When you want to plot data, you already have within python lists, you can construct a data instance yourself to use them in plot methods of the graph. An example would be: d = data.data([[1, 1], [2, 4], [3, 9], [4, 16], [5, 25]]) The valid column numbers are 0 and 1 for this case. Note that when reading a dataset from a file the columns are numbered from 1, while the column 0 is added automatically and contains the line number. 3) It is possible to create own data styles to be used in the graph. While this is not yet well documented, you have to look into the graph sources for that. I should note, that the graph styles are subject of a complete redesign and documentation in the forthcoming releases. André  by _ _ _ Dr. André Wobst / \ \ / ) wobsta@..., http://www.wobsta.de/ / _ \ \/\/ / PyX  High quality PostScript figures with Python & TeX (_/ \_)_/\_/ visit http://pyx.sourceforge.net/ 