【課程3.10】 散點圖、矩陣散點圖
plt.scatter(), pd.scatter_matrix()
1.plt.scatter()散點圖
# plt.scatter(x, y, s=20, c=None, marker='o', cmap=None, norm=None, vmin=None, vmax=None,
# alpha=None, linewidths=None, verts=None, edgecolors=None, hold=None, data=None, **kwargs)
plt.figure(figsize=(8,6))
x = np.random.randn(1000)
y = np.random.randn(1000)
plt.scatter(x,y,marker='.',
s = np.random.randn(1000)*100,
cmap = 'Reds',
c = y,
alpha = 0.8,)
plt.grid()
# s:散點的大小
# c:散點的顏色
# vmin,vmax:亮度設置,標量
# cmap:colormap
2.pd.scatter_matrix()散點矩陣
# pd.scatter_matrix(frame, alpha=0.5, figsize=None, ax=None,
# grid=False, diagonal='hist', marker='.', density_kwds=None, hist_kwds=None, range_padding=0.05, **kwds)
df = pd.DataFrame(np.random.randn(100,4),columns = ['a','b','c','d'])
pd.scatter_matrix(df,figsize=(10,6),
marker = 'o',
diagonal='kde',
alpha = 0.5,
range_padding=0.1)
******通過查找pandas文檔,發現現在的pandas的scatter_matrix用法已經發生變化了,變成了pandas.plotting.scatter_matrix
# diagonal:({‘hist’, ‘kde’}),必須且只能在{‘hist’, ‘kde’}中選擇1個 → 每個指標的頻率圖
# range_padding:(float, 可選),圖像在x軸、y軸原點附近的留白(padding),該值越大,留白距離越大,圖像遠離座標原點