.. _pylab_examples-line_collection2: pylab_examples example code: line_collection2.py ================================================ .. plot:: /home/tcaswell/other_source/matplotlib/doc/mpl_examples/pylab_examples/line_collection2.py :: from pylab import * from matplotlib.collections import LineCollection # In order to efficiently plot many lines in a single set of axes, # Matplotlib has the ability to add the lines all at once. Here is a # simple example showing how it is done. N = 50 x = arange(N) # Here are many sets of y to plot vs x ys = [x+i for i in x] # We need to set the plot limits, they will not autoscale ax = axes() ax.set_xlim((amin(x),amax(x))) ax.set_ylim((amin(amin(ys)),amax(amax(ys)))) # colors is sequence of rgba tuples # linestyle is a string or dash tuple. Legal string values are # solid|dashed|dashdot|dotted. The dash tuple is (offset, onoffseq) # where onoffseq is an even length tuple of on and off ink in points. # If linestyle is omitted, 'solid' is used # See matplotlib.collections.LineCollection for more information line_segments = LineCollection([list(zip(x,y)) for y in ys], # Make a sequence of x,y pairs linewidths = (0.5,1,1.5,2), linestyles = 'solid') line_segments.set_array(x) ax.add_collection(line_segments) fig = gcf() axcb = fig.colorbar(line_segments) axcb.set_label('Line Number') ax.set_title('Line Collection with mapped colors') sci(line_segments) # This allows interactive changing of the colormap. show() Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)