graphics with PSTric..

Plotting Tricks\begin{pspicture}(-2,-3)(2,3)\psgrid[gridcolor=Apricot,%gridlabelcolor=Mahogany,%subgridcolor=Apricot]\psplot[plotstyle=curve,%linecolor=Blue]%{-1.5}{1.5}{x 3 exp x sub}\end{pspicture}Function plottingAxes of coordinatesData plottingThe first command \psgrid just draws the coordinate grid, as we haveseen earlier. The actual curve is drawn by the \psplot command. Let’slook at this a bit more closely. The expression x 3 exp x sub is just thePostScirpt way of saying x 3 − x. In general, we must specify the equationwhich gives the y-coordinate of each point of the curve in terms of the x-coordinate.(or as mathematicians prefer to say, y should be given as a function of x).The numbers -1.5 and 1.5 give respectively the minimum and maximumvalue of the x-coordinate in the curve to be drawn. Thus the basic drawingcommand is\psplot{min x}{man x}{equation}Looking back at our example, we see that here, the command \psplot alsoincludes some parameters. The setting linecolor=Blue just makes the curveblue. What about plotstyle=curve? This makes \psplot draw a \pscurvethrough a certain number of points with coordinates computed from theequation. The number of points used is by default 50, but it can be controlledby the parameter plotpoints. This is illustrated in the next example:Online L A TEX TutorialPart II – GraphicsPSTricksE Krishnan, CV Radhakrishnan and AJ Alexconstitute the graphics tutorial team. Commentsand suggestions may be mailed totutorialteam@tug.org.inc○2002, 2003, The Indian TEX Users GroupThis document is generated by PDFTEX withhyperref, pstricks, pdftricks and pdfscreenpackages in an intel PC running GNU/LINUXand is released under LPPLThe Indian TEX Users GroupFloor III, SJP Buildings, Cotton HillsTrivandrum 695014, INDIAhttp://www.tug.org.in£ ¡ ¢ ¤ ¥ ¦ © 4/31