語法

plt.scatter(x,y,s=20,c='b')

大小s預設為20，s=0時點不顯示；顏色c預設為藍色。

為每一個點指定大小和顏色

有時我們需要為每一個點指定大小和方向，以區分不同的點。這時，可以向s和c傳入列表。如：

import matplotlib.pyplot as plt
import numpy as np
x = list(range(1,7))
plt.scatter(x,x,s=10*np.array(x)**2,c=x)
plt.show()

引數s=[1,4,9,16,25,36]，c=[1,2,3,5,6]，輸出為：

其中顏色列表的意思是，在下圖的顏色帶中按比例取顏色。如 s=[1,2] 表示的兩個顏色分別是：最左邊的顏色和最右邊的顏色；s=[100,103,150,200] 的四個顏色分別是：最左邊的顏色，最左邊的顏色（100和103差別不大），中間的顏色，最右邊的顏色。

補充知識：matplotlib 畫圖顏色引數值及對應色卡

matplotlib 色卡對應引數值

cnames = {
'aliceblue':   '#F0F8FF','antiquewhite':   '#FAEBD7','aqua':     '#00FFFF','aquamarine':   '#7FFFD4','azure':    '#F0FFFF','beige':    '#F5F5DC','bisque':    '#FFE4C4','black':    '#000000','blanchedalmond':  '#FFEBCD','blue':     '#0000FF','blueviolet':   '#8A2BE2','brown':    '#A52A2A','burlywood':   '#DEB887','cadetblue':   '#5F9EA0','chartreuse':   '#7FFF00','chocolate':   '#D2691E','coral':    '#FF7F50','cornflowerblue':  '#6495ED','cornsilk':    '#FFF8DC','crimson':    '#DC143C','cyan':     '#00FFFF','darkblue':    '#00008B','darkcyan':    '#008B8B','darkgoldenrod':  '#B8860B','darkgray':    '#A9A9A9','darkgreen':   '#006400','darkkhaki':   '#BDB76B','darkmagenta':   '#8B008B','darkolivegreen':  '#556B2F','darkorange':   '#FF8C00','darkorchid':   '#9932CC','darkred':    '#8B0000','darksalmon':   '#E9967A','darkseagreen':   '#8FBC8F','darkslateblue':  '#483D8B','darkslategray':  '#2F4F4F','darkturquoise':  '#00CED1','darkviolet':   '#9400D3','deeppink':    '#FF1493','deepskyblue':   '#00BFFF','dimgray':    '#696969','dodgerblue':   '#1E90FF','firebrick':   '#B22222','floralwhite':   '#FFFAF0','forestgreen':   '#228B22','fuchsia':    '#FF00FF','gainsboro':   '#DCDCDC','ghostwhite':   '#F8F8FF','gold':     '#FFD700','goldenrod':   '#DAA520','gray':     '#808080','green':    '#008000','greenyellow':   '#ADFF2F','honeydew':    '#F0FFF0','hotpink':    '#FF69B4','indianred':   '#CD5C5C','indigo':    '#4B0082','ivory':    '#FFFFF0','khaki':    '#F0E68C','lavender':    '#E6E6FA','lavenderblush':  '#FFF0F5','lawngreen':   '#7CFC00','lemonchiffon':   '#FFFACD','lightblue':   '#ADD8E6','lightcoral':   '#F08080','lightcyan':   '#E0FFFF','lightgoldenrodyellow': '#FAFAD2','lightgreen':   '#90EE90','lightgray':   '#D3D3D3','lightpink':   '#FFB6C1','lightsalmon':   '#FFA07A','lightseagreen':  '#20B2AA','lightskyblue':   '#87CEFA','lightslategray':  '#778899','lightsteelblue':  '#B0C4DE','lightyellow':   '#FFFFE0','lime':     '#00FF00','limegreen':   '#32CD32','linen':    '#FAF0E6','magenta':    '#FF00FF','maroon':    '#800000','mediumaquamarine':  '#66CDAA','mediumblue':   '#0000CD','mediumorchid':   '#BA55D3','mediumpurple':   '#9370DB','mediumseagreen':  '#3CB371','mediumslateblue':  '#7B68EE','mediumspringgreen': '#00FA9A','mediumturquoise':  '#48D1CC','mediumvioletred':  '#C71585','midnightblue':   '#191970','mintcream':   '#F5FFFA','mistyrose':   '#FFE4E1','moccasin':    '#FFE4B5','navajowhite':   '#FFDEAD','navy':     '#000080','oldlace':    '#FDF5E6','olive':    '#808000','olivedrab':   '#6B8E23','orange':    '#FFA500','orangered':   '#FF4500','orchid':    '#DA70D6','palegoldenrod':  '#EEE8AA','palegreen':   '#98FB98','paleturquoise':  '#AFEEEE','palevioletred':  '#DB7093','papayawhip':   '#FFEFD5','peachpuff':   '#FFDAB9','peru':     '#CD853F','pink':     '#FFC0CB','plum':     '#DDA0DD','powderblue':   '#B0E0E6','purple':    '#800080','red':     '#FF0000','rosybrown':   '#BC8F8F','royalblue':   '#4169E1','saddlebrown':   '#8B4513','salmon':    '#FA8072','sandybrown':   '#FAA460','seagreen':    '#2E8B57','seashell':    '#FFF5EE','sienna':    '#A0522D','silver':    '#C0C0C0','skyblue':    '#87CEEB','slateblue':   '#6A5ACD','slategray':   '#708090','snow':     '#FFFAFA','springgreen':   '#00FF7F','steelblue':   '#4682B4','tan':     '#D2B48C','teal':     '#008080','thistle':    '#D8BFD8','tomato':    '#FF6347','turquoise':   '#40E0D0','violet':    '#EE82EE','wheat':    '#F5DEB3','white':    '#FFFFFF','whitesmoke':   '#F5F5F5','yellow':    '#FFFF00','yellowgreen':   '#9ACD32'}
 

seaborn 的色卡對應引數值

裝了seaborn擴充套件的話，在字典seaborn.xkcd_rgb中包含所有的xkcd crowdsourced color names。

使用的程式碼

plt.plot([1,2],lw=4,c=seaborn.xkcd_rgb['baby poop green'])

以上這篇python matplotlib:plt.scatter() 大小和顏色引數詳解就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支援我們。