def bar_chart_generator():

    l = [1,2,3,4,5]

    h = [20, 14, 38, 27, 9]

    w = [0.1, 0.2, 0.3, 0.4, 0.5]

    b = [1,2,3,4,5]

 

    fig = plt.figure()

    ax = fig.add_subplot(111)

    rects = ax.bar(l, h, w, b,

                   color='#ffff00',

                   edgecolor='#000000',

                   linewidth=2,

                   #xerr=4,

                   #yerr=1,

                   #ecolor='#999999',

                   #capsize=10,

                   #align='center',

                   #orientation='horizontal',

                  )

    plt.savefig('bar.png')

==================================

 

函数原型:

matplotlib.pyplot.bar(left, height, width=0.8, bottom=None, hold=None, **kwargs)

 

基本参数:

left        每个柱x轴左边界

bottom      每个柱y轴下边界

height      柱高度(Y轴方向) 

width       柱宽度(X轴方向)

以上参数可以设置为数值或者list

但要保证如果为list, len(list)要一致

绘制的方形为:

    X: left   --- left+width

    Y: bottom --- bottom+height

返回值:

    matplotlib.patches.Rectangle

 

柱状图使用bottom扩展即可化为甘特图 Gantt Chart

 

其他参数:

color       Bar颜色

edgecolor   Bar边界线颜色

align       可选['left'(default) | 'center']

            决定整个bar图分布

            默认left表示默认从左边界开始绘制,center会将图绘制在中间位置

 

xerr        x方向error bar

yerr        y方向error bar

ecolor      error bar颜色

capsize     error bar横线宽度(default 3)

 

样例：

基本设置

l = [1,2,3,4,5]

h = [20, 14, 38, 27, 9]

w = [0.1, 0.2, 0.3, 0.4, 0.5]

b = [1,2,3,4,5]

设置xerr=4

设置yerr=1,ecolor='#999999'

 

转载至 http://blog.sina.com.cn/s/blog_b09d4602010194wy.html