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 
From: Andre Wobst <wobsta@us...>  20040120 16:04:51

Hi, we are proud to announce the release of PyX 0.5. This release marks an important development step towards a final design of the internal and visible interfaces of PyX. The most prominent changes are:  rewrite of the attribute system to improve both consistency and flexibility (this introduces new concepts, conventions and modules which renders this release not backward compatible; however, modifying existing code is not very difficult, since all the functionality is still avaiable)  further improved TeX integration (integrated virtual font handling, configurable font mapping files, support for markers to access positions within the text, support for TeX's interprocess communication option, split the dvifile reader from text module)  some internal improvements in the graph module along with pathaxis  streamlined install process (C extention modules for font stripping and path searching has become optional)  new FAQ  lots of small improvements and bug fixes Find a more detailed list of changes below. Enjoy! Jörg, Michael, André  0.5 (2004/01/20):  setup.py and distribution:  allow customization of the extension modules built (via setup.cfg)  disable building pykpathsea module by default  more detailed description of install process in INSTALL  provide more information and pointers to other files in README  include example data files in distribution (suggested by Andrea Riciputi)  force dvips to write ps files instead of printing them (suggested by Otto Tronarp)  includ pyxfaq.pdf in distribution  text module:  improved isreadable test for lfs files and pyx.def file  explicitly quit (La)TeX in cleantmp (helps when quitting with <Ctrl>C)  showwaitfortex implemented following a suggestion by Fernando Perez (waitfortex is increased to 60 seconds now)  support of TeX extention ipc for reading dvi results while TeX keeps running  configurable font mapping files (via pyxrc or parameter of the texrunner constructor)  markers to get access to positions within TeX expressions  fix: allow for etex in texmessage.start (reported by Andrea Riciputi)  fix: print warning at syntax errors in font mapping file and continue (cf. bug #795271)  remove limitation on number of fonts in dvi file  added native virtual font support  dvicopy support not needed anymore (it is still available, but obsolete and removed from the documentation)  do not include too many glyphs in the eps file  _xxx > xxx_pt renaming  dvifile module (NEW):  separated from the text module  dvifile class returns standard pyx canvas instances on readpage  graph module:  removed manualpart and partitioners mix keyword  results of the splitting at "=" in graph.function were not stripped  skip title=None in key (cf. bug #821284), properly align a single key entry  another (the last?!) axis redesign: axispos > class of its own  some axispos name have changed slightly (zeroline > zeropath etc.)  tick/datavmin/vmax removed  pathaxis  linkaxis  minor enhancements in exponentionaltexter  axes alongs paths including a set of examples  mixing a partitioner and manual ticks by two distinct keyword arguments now  _xxx > xxx_pt renaming  part > parter renaming  canvas module:  stroke, fill, draw, set and insert do no longer accept variable length argument lists but an attribute list as last argument  stroke and fill now support trafos (TODO: documentation)  uppercase version of a4, a3, ... paperformats  config module:  new module for loading PyX configuration information  pyx module:  automatically import main modules into pyx namespace as suggested by Fernando Perez.  path module:  check for sorting of parameter list passed to path.split method  _xxx > xxx_pt renaming  deco module (NEW):  contains decoratedpath and decorators from canvas module  all predefined decorators are instances now (deco.stroked is thus ok) and attributes have to be passed explicitely, e.g., deco.earrow.small(attrs=color.rgb.red) and deco.stroked([color.rgb.blue])  style module (NEW):  contains all line and fillstyles which formerly had been defined in the canvas module  dash now supports relative dash lengths (as suggested by Otto Tronarp)  mathtree module:  fixed incorrect handling of  (for instance x**2 was not negative)  attrlist module:  contents have been moved to the (obsolete) tex module, which was the only user anyhow, and the module itself was removed  t1strip module:  new fallback solution in pure python  bugfix: pyxadapt.h needs to open files binary under Windows (reported by Gary Pajer)  box module:  _xxx > xxx_pt renaming  trafo module:  _xxx > xxx_pt renaming  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...>  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 
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: 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/ 
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. > > 