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From: Michael Schindler <mschindler@us...>  20040121 18:52:04

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.  "A mathematician is a device for turning coffee into theorems" Paul Erdös. 
From: Sudheer Phani <bpsu@it...>  20040121 17:14:56

Hello I am looking for help regarding the plot. for example If I have y = [2,4,,6,8,10 ] and want to plot the values of x using some of those examples given in the webpages http://pyx.sourceforge.net/examples.html Then we would plot taking the index on the xaxis and y(array y) values on yaxis. using the following code g = graph.graphxy(width=8) g.plot(graph.data("minimal.dat", x=1, y=2)) g.writetofile("minimal") I would get the 5 points with X marks for the corresponding (x,y) points. # my (x,y) points are [(0,2),[1,4],[2,6],[3,8],[4,10]) 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 Thanks Sudheer 