Hello,

I want to plot a stepwise line using

plot([1,2,3,4,5],[2,-2,2,-2,2]). But what I get is something like two

triangular like shape. But I want a stepwise shape that has steep

vertical jumps. How can I do that?

Many thanks,

Zhang Le

# how to plot stepwise lines

I want to plot a stepwise line using

plot([1,2,3,4,5],[2,-2,2,-2,2]). But what I get is something like two

triangular like shape. But I want a stepwise shape that has steep

vertical jumps. How can I do that?

this what you mean?

#!/usr/bin/env python

from pylab import *

plot([1,2,3,4,5],[2,-2,2,-2,2], linestyle='steps')

gca().set_ylim( (-3, 3))

show()

## ···

Many thanks,

Zhang Le-------------------------------------------------------

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Peter Groszkowski Gemini Observatory

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It sounds like you want step_pts from

http://www.american.edu/econ/pytrix/pytrix.py

Maybe.

Alan Isaac

def step_pts(x, y):

'''Given x and y, return points for step function plot.

:Parameters:

- `x`: [x0,x1,...,xn] list of x values (first coordinate)

- `y`: [y0,y1,...,yn] list of y values (second coordinate)

:rtype: tuple of lists

:return: (xnew,ynew)

where xnew=(x0,x1,x1,...,xn,xn) and ynew=(y0,y0,y1,y1,...,yn).

:author: Alan G. Isaac

:since: 2005-05-15

'''

pts=zip(x,y) #original points as tuples

inter = zip(x[1:],y[:-1]) #new points as tuples

#now splice pts and inter -> list of all points as tuples

pts_inter = [j for i in map(None,pts,inter) for j in i][:-1]

#split the points list into (x-coordinates),(y-coordinates)

z = zip(*pts_inter)

return z[0],z[1]