matplotlib 柱狀圖 Bar Chart 樣例及參數

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')

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

 

函數原型:

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

 

基本參數:

left        每一個柱x軸左邊界

bottom      每一個柱y軸下邊界

height      柱高度(Y軸方向) 

width       柱寬度(X軸方向)

以上參數能夠設置爲數值或者list

但要保證若是爲list, len(list)要一致

繪製的方形爲:

    X: left   --- left+width

    Y: bottom --- bottom+height

返回值:

    matplotlib.patches.Rectangle

 

柱狀圖使用bottom擴展便可化爲甘特圖 Gantt Chart

 

其餘參數:

color       Bar顏色

edgecolor   Bar邊界線顏色

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

            決定整個bar圖分佈

            默認left表示默認從左邊界開始繪製,center會將圖繪製在中間位置

 

xerr        x方向error bar

yerr        y方向error bar

ecolor      error bar顏色

capsize     error bar橫線寬度(default 3)

 

樣例：

基本設置

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]

設置xerr=4

設置yerr=1,ecolor='#999999'

 

轉載至 http://blog.sina.com.cn/s/blog_b09d4602010194wy.html