我对使用matplotlib作图比较陌生,目前我正在尝试绘制一个时间范围的螺旋图,我已经工作了好几天了,我遇到了一个问题,一直无法解决。
我正在从一个excel文件中绘制图表,格式如下,间隔1分钟,我有最多30天的数据。
Timestamp alarms summatory
01/12/2018 00:00 3
01/12/2018 00:01 1
01/12/2018 00:02 2
01/12/2018 00:03 1
01/12/2018 00:04 1
01/12/2018 00:05 3
01/12/2018 00:06 1
01/12/2018 00:07 3
01/12/2018 00:08 1
01/12/2018 00:09 4
01/12/2018 00:10 3
根据社区中提出的其他问题和一些文档,我得到了以下图表,其中2个pi是一天,每种颜色代表一分钟内被激活的警报数量。
我想显示这些事件的1分钟,但在他们的可视化是更容易的方式,从第一天以下的图形,其中有一个空的中心和线开始绘制更远的中心 。
我一直在尝试修改行距函数的参数,试图得到最后一张图片的图形,但都没有成功,我不知道还能做什么,希望有人能帮帮我。
这是我一直使用的代码和excel文件。
编码
import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt
import matplotlib.patheffects as mpe
import matplotlib.colors as colors
import pandas as pd
from datetime import datetime, timedelta
# styling
LINEWIDTH=5
EDGEWIDTH=0
CAPSTYLE="projecting"
ALPHA=1
FIRSTHOUR=0 # 0= 24 hrs, 23= 23 hrs
cdict = {'red': ((0.0, 0.0, 0.0),
(1/6., 0.0, 0.0),
(1/2., 0.8, 1.0),
(5/6., 1.0, 1.0),
(1.0, 0.4, 1.0)),
'green': ((0.0, 0.0, 0.4),
(1/6., 1.0, 1.0),
(1/2., 1.0, 0.8),
(5/6., 0.0, 0.0),
(1.0, 0.0, 0.0)),
'blue': ((0.0, 0.0, 0.0),
(1/6., 0.0, 0.0),
(1/2., 0.9, 0.9),
(5/6., 0.0, 0.0),
(1.0, 0.0, 0.0))
}
COLORMAP=colors.LinearSegmentedColormap.from_list("", ["green","yellow","red"])
#Read excel
df = pd.read_excel('alarms_boiler_1min_v2.xlsx')
df['Timestamp'] = df['Timestamp'].replace('/','-').apply(pd.to_datetime)
#set origin
firts_timestamp =df['Timestamp'].min()
origin = (firts_timestamp + pd.to_timedelta(firts_timestamp.hour - FIRSTHOUR, unit='hours'))
day = pd.date_range("00:00", "23:00", freq="60min").strftime('%H:%M').tolist()
# convert alarms sumatory timestamps to day fractions
df['start'] = (df['Timestamp'] - origin) / np.timedelta64(1, 'D')
df['stop'] = (pd.DatetimeIndex(df['Timestamp']) + timedelta(minutes=1)- origin)/np.timedelta64(1,
'D')
fig = plt.figure(figsize=(8, 6))
ax = fig.gca(projection="polar")
for idx, event in df.iterrows():
# sample normalized alarms summatory colormap
alarms_sum = event['alarms summatory']/4
color = plt.cm.get_cmap(COLORMAP)(alarms_sum)
tstart, tstop = event.loc[['start', 'stop']]
# timestamps are in day fractions, 2pi is one day
nsamples = int(10000. * (tstop - tstart))
t = np.linspace(tstart, (tstop),nsamples)
theta = 2 * np.pi * (t)
arc, = ax.plot(theta, t, lw=LINEWIDTH, color=color, solid_capstyle=CAPSTYLE, alpha=ALPHA)
arc.set_path_effects([mpe.Stroke(linewidth=LINEWIDTH+EDGEWIDTH, foreground='black'),mpe.Normal()])
#set grid, labels
ax.set_rticks([])
ax.set_theta_zero_location("N")
ax.set_theta_direction(-1)
ax.set_xticks(np.linspace(0, 2*np.pi, 24, endpoint=False))
ax.set_xticklabels(day)
ax.tick_params('x', pad=2)
ax.grid(True)
#show graph
norm = mpl.colors.Normalize(vmin=0, vmax=4)
sm = plt.cm.ScalarMappable(cmap=COLORMAP, norm=norm)
sm.set_array([])
plt.colorbar(sm, ticks=np.linspace(0, 4, 10), fraction=0.04, aspect=60, pad=0.1, label="alarms summatory", ax=ax)
plt.show()
先谢谢您,祝您愉快。