problems making grayscale lines

Hi all,

I'm trying to make a plot with several lines, each with a different
grayscale color. I thought I could do something like
clrs = ['0.125', '0.25', '0.375', '0.5', '0.625', '0.75', '0.875',
and then either set the color cycle using clrs or just use the
color=clrs[i] argument in a loop that draws the lines. This kind of
works, but it seems that there's some autoscaling going on. If I use
values ranging from 0 to 1, the curve with 0 doesn't show up at all
(which I would expect) and the curve with 1 is black. If I use values
ranging from 0.5 to 1, the curve with 0.5 doesn't show up and the curve
with 1 is gray instead of black. What gives? How can I get a set of
curves with gray values ranging from medium gray to black?

As a simple demo if I do:
import matplotlib.pyplot as plt
import numpy as np
import as cmap

x = np.linspace(0,1.,num=10)
y1 = 0.5*x
y2 = 0.4*x
fig = plt.figure()
ax = fig.add_subplot(1,1,1)

I get a single visible line that is a sort of medium gray.



Jonathan D. Slavin Harvard-Smithsonian CfA
jslavin@...1081... 60 Garden Street, MS 83
phone: (617) 496-7981 Cambridge, MA 02138-1516
cell: (781) 363-0035 USA