我被困在一个问题上。如果我在列表中有一组数据(比如说学生数量及其对应的等级)我如何编写代码以在快速绘制中创建直方图?
答案 0 :(得分:1)
Quickdraw开箱即用支持图表。一切都需要自己绘制和映射,这是一个例子:
#!/bin/python
import random
#create 40 random grades
grades = [(float(int(float(20*random.random())))/2)+0.5 for i in xrange(40)]
#count the occurrence of each grade
histogram = []
for i in sorted(set(grades)): histogram.append([int(i*50),grades.count(i)])
#some grid information
gridsize = 500
griddiv = 20
topleft = 50
#graph title
print 'text', '"','Histogram of Grades','"', 220, 25
#x axis title
for i in range(1,21):
print 'text', '"',float(i)/2,'"', (i+1)*25, 570
#y axix title
for i in range(0,11):
print 'text', '"',i,'"', 25, 600-(i+1)*50
#grid
print 'grid', topleft, topleft, gridsize, gridsize, griddiv, griddiv
#chart rectangles
print 'color 0 140 0'
for i in histogram:
print 'fillrect',i[0]-25+topleft, gridsize-(50*i[1])+topleft,gridsize/griddiv,50*i[1],'b'+str(i[0])
print 'fillrect', 'color','b'+str(i[0])
将代码保存在histogram.py
并运行python histogram.py | java -jar quickdraw.jar
,请注意它不是很漂亮!更好的方法是使用python库matplotlib