.. _pylab_examples-barchart_demo2: pylab_examples example code: barchart_demo2.py ============================================== .. plot:: /home/tcaswell/source/my_source/matplotlib/doc/mpl_examples/pylab_examples/barchart_demo2.py :: """ Thanks Josh Hemann for the example This examples comes from an application in which grade school gym teachers wanted to be able to show parents how their child did across a handful of fitness tests, and importantly, relative to how other children did. To extract the plotting code for demo purposes, we'll just make up some data for little Johnny Doe... """ import numpy as np import matplotlib.pyplot as plt from matplotlib.ticker import MaxNLocator student = 'Johnny Doe' grade = 2 gender = 'boy' cohortSize = 62 # The number of other 2nd grade boys numTests = 5 testNames = ['Pacer Test', 'Flexed Arm\n Hang', 'Mile Run', 'Agility', 'Push Ups'] testMeta = ['laps', 'sec', 'min:sec', 'sec', ''] scores = ['7', '48', '12:52', '17', '14'] rankings = np.round(np.random.uniform(0, 1, numTests)*100, 0) fig, ax1 = plt.subplots(figsize=(9, 7)) plt.subplots_adjust(left=0.115, right=0.88) fig.canvas.set_window_title('Eldorado K-8 Fitness Chart') pos = np.arange(numTests) + 0.5 # Center bars on the Y-axis ticks rects = ax1.barh(pos, rankings, align='center', height=0.5, color='m') ax1.axis([0, 100, 0, 5]) plt.yticks(pos, testNames) ax1.set_title('Johnny Doe') plt.text(50, -0.5, 'Cohort Size: ' + str(cohortSize), horizontalalignment='center', size='small') # Set the right-hand Y-axis ticks and labels and set X-axis tick marks at the # deciles ax2 = ax1.twinx() ax2.plot([100, 100], [0, 5], 'white', alpha=0.1) ax2.xaxis.set_major_locator(MaxNLocator(11)) xticks = plt.setp(ax2, xticklabels=['0', '10', '20', '30', '40', '50', '60', '70', '80', '90', '100']) ax2.xaxis.grid(True, linestyle='--', which='major', color='grey', alpha=0.25) # Plot a solid vertical gridline to highlight the median position plt.plot([50, 50], [0, 5], 'grey', alpha=0.25) # Build up the score labels for the right Y-axis by first appending a carriage # return to each string and then tacking on the appropriate meta information # (i.e., 'laps' vs 'seconds'). We want the labels centered on the ticks, so if # there is no meta info (like for pushups) then don't add the carriage return to # the string def withnew(i, scr): if testMeta[i] != '': return '%s\n' % scr else: return scr scoreLabels = [withnew(i, scr) for i, scr in enumerate(scores)] scoreLabels = [i + j for i, j in zip(scoreLabels, testMeta)] # set the tick locations ax2.set_yticks(pos) # set the tick labels ax2.set_yticklabels(scoreLabels) # make sure that the limits are set equally on both yaxis so the ticks line up ax2.set_ylim(ax1.get_ylim()) ax2.set_ylabel('Test Scores') # Make list of numerical suffixes corresponding to position in a list # 0 1 2 3 4 5 6 7 8 9 suffixes = ['th', 'st', 'nd', 'rd', 'th', 'th', 'th', 'th', 'th', 'th'] ax2.set_xlabel('Percentile Ranking Across ' + str(grade) + suffixes[grade] + ' Grade ' + gender.title() + 's') # Lastly, write in the ranking inside each bar to aid in interpretation for rect in rects: # Rectangle widths are already integer-valued but are floating # type, so it helps to remove the trailing decimal point and 0 by # converting width to int type width = int(rect.get_width()) # Figure out what the last digit (width modulo 10) so we can add # the appropriate numerical suffix (e.g., 1st, 2nd, 3rd, etc) lastDigit = width % 10 # Note that 11, 12, and 13 are special cases if (width == 11) or (width == 12) or (width == 13): suffix = 'th' else: suffix = suffixes[lastDigit] rankStr = str(width) + suffix if (width < 5): # The bars aren't wide enough to print the ranking inside xloc = width + 1 # Shift the text to the right side of the right edge clr = 'black' # Black against white background align = 'left' else: xloc = 0.98*width # Shift the text to the left side of the right edge clr = 'white' # White on magenta align = 'right' # Center the text vertically in the bar yloc = rect.get_y() + rect.get_height()/2.0 ax1.text(xloc, yloc, rankStr, horizontalalignment=align, verticalalignment='center', color=clr, weight='bold') plt.show() Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)