Hi all I want to draw an two headed arrow between two points. But I get a line. What I am doing wrong? I actually try to plot an image similar to this one: http://upload.wikimedia.org/wikipedia/commons/a/a3/Parameters_of_the_Marcus_Equation.JPG may be I can use an annotate function for this. Thanks for help. Petro. ######## import pylab from scipy import optimize import numpy x1=numpy.arange(-4000,1000,0.1) x2=numpy.arange(-1000,4000,0.1) y1=100*numpy.square(x1+1500) y2=100*numpy.square(x2-1500)-0.1e9 pylab.figure() pylab.plot(x1,y1,x2,y2) pylab.grid("True") pylab.arrow(-3000,0,0,-100000000,width=1) pylab.xlim(-5000,5000) pylab.ylim(-2e8,7e8) pylab.show() ###########x
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