2017-02-16 81 views
0

(使用python 3.5 x64 for windows)Python Matplotlib pyplot - 不符合數據的x軸值

嗨!

在特定的unix時間使用整數格式的數據。 我有一個問題,我希望x軸(unix時間)是「秒以來的第一次記錄以來的時間」,但是這個軸的值不適合這個。我的意思是:y軸的第一個整數沒有設置在x軸的0值處。 如何更改x軸的值以適應我的需求? 我嘗試了幾件事:xticks,axes.set_ylim()...但總是遇到一個我無法解決的問題。 xticks可以工作,但我不知道如何適應UNIX時間在使CPM和時間之間的相關性不迷失方向......

def plot_overview2(selector = None): 
global logtime, logtime_delta, cpm, color 

plt.figure(figsize=(14,7), dpi=70, facecolor="none")  #was figsize=(20,10),dpi=70,facecolor="none" - filled whole screen 
plt.suptitle('CPM ', fontsize=16, fontweight='bold') 
plt.subplots_adjust(hspace=None, wspace=.2, left=.05, top=.95, bottom=.07, right=.98) 
plt.subplot(1, 1, 1) 
plt.grid(True) 

# add a label to the x and y axis 
plt.xlabel('Time since first record [sec]')  
plt.ylabel("CPM") 

# define the x-axis limits 
xmin = logtime.min() # e.g. 1483049960.0 
xmax = logtime.max() # e.g. 1483295877.0 
plt.xlim(xmin, xmax) # if commented out then the plot will find its own limits 
#plt.xticks(1, logtime_delta) 

# define the y-axis limits 
#plt.ylim(0, 150) # if commented out then the plot will find its own limits 

recmax = cpm.size  # allows to limit the data range plotted 
# plot the raw data 
plt.plot(logtime[:recmax],cpm[:recmax], color=color['cpm'], linewidth=.75, label ="") #linewidth was .5, logtime[:recmax],cpm[:recmax] 
#plt.plot_date(logtime, cpm, color=color['cpm'], linewidth=.75, label ="") 

# plot the moving average over N datapoints with red on yellow line background 
# skip the first and last N/2 data points, which are meaningless due to averaging 
if len(logtime) < 300: 
    N=len(logtime)+1/2 
else: 
    N=300 
plt.plot(logtime[N//2:recmax - N//2], np.convolve(cpm, np.ones((N,))/N, mode='same')[N//2:recmax - N//2], color="yellow", linewidth=6, label ="") 
plt.plot(logtime[N//2:recmax - N//2], np.convolve(cpm, np.ones((N,))/N, mode='same')[N//2:recmax - N//2], color="red", linewidth=2, label ="MovAvg, N="+str(N)) 

# plot the line for the average 
av  = np.empty(recmax) 
npav = np.average(cpm[:recmax]) 
av[:] = npav 
plt.plot(logtime[:recmax], av[:recmax], color=color['MW'], linewidth=2, label= "Average CPM={0:6.3f}".format(npav)) 

# plot the legend in the upper left corner 
plt.legend(bbox_to_anchor=(1.01, .9), loc=2, borderaxespad=0.) 
plt.legend(loc='upper left') 

我真的新的Python。所以你能否給出簡單的答案。 :) 謝謝!

第一繪圖線開始於幾乎20000

回答

0

也許你可以減去偏移,當你的情節,這樣的事情:

plot(logtime[N//2:recmax - N//2] - logtime[0], ... 

所有地塊。

+0

好吧,工作,並非常容易... xD謝謝! – Distelzombie

+0

沒問題:)你能接受答案嗎? –