如何在matplotlib中將y軸設置爲成千上萬

Question

我有以下代碼來使用Jupyter在Pytho中創建一組2 x 2圖。問題是第四個圖的左邊y標籤（右下）與第三個右邊的y標籤相沖突。我試圖將第四個情節的left-y-label的縮放比例改爲數千，所以不是顯示-1000,0,1000等等，而是僅僅爲了給標題留出足夠的空間1,0,1。我怎樣才能做到這一點？

下面我的代碼：

#Testing 2 x 2 plots for FO reporting 

plt.figure(figsize=(15,9)) 

#First Plot 

ax1=plt.subplot(2,2,1) 
plt.title("Downhole Pressure") 
ax1.plot(Time, Downhole_pressure, 'b', markersize=2, label="Downhole pressure") 
plt.xlabel("Injection time", fontsize=10) 
plt.xlim(0,80) 
plt.ylabel("Pressure, (psi)", fontsize=10) 
plt.ylim(6500,7500) 
plt.legend(bbox_to_anchor=(.999,.89), prop={'size': 10}) 

ax2=ax1.twinx() 
ax2.plot(Time, Slurry_rate,'m', markersize=2, label="Slurry") 
ax2.plot(Time, Proppant_rate, 'g', markersize=2, label="Proppant") 
plt.ylabel("Injection rate, (BPM))", fontsize=10) 
plt.ylim(0,100) 

plt.legend(bbox_to_anchor=(.879,.825), prop={'size': 10}) 

#Second Plot 

ax1=plt.subplot(2,2,2) 
plt.title("Fracture Width") 
ax1.plot(Time, Max_Frac_Witdth, 'b', markersize=2, label="Max") 
ax1.plot(Time, Mean_Frac_Width, 'r', markersize=2, label="Mean") 
plt.xlabel("Injection time", fontsize=10) 
plt.xlim(0,80) 
plt.ylabel("Fracture width, (mm)", fontsize=10) 
plt.ylim(0,10) 
plt.legend(bbox_to_anchor=(.84,.89), prop={'size': 10}) 

ax2=ax1.twinx() 
ax2.plot(Time, Slurry_rate,'m', markersize=2, label="Slurry") 
ax2.plot(Time, Proppant_rate, 'g', markersize=2, label="Proppant") 
plt.ylabel("Injection rate, (BPM))", fontsize=10) 
plt.ylim(0,100) 
plt.legend(bbox_to_anchor=(.879,.775), prop={'size': 10}) 

#Third Plot 

ax1=plt.subplot(2,2,3) 
plt.title("Fracture Height") 
ax1.plot(Time, Max_Frac_Ver_Pos, 'b', markersize=2, label="Max") 
ax1.plot(Time, Min_Frac_Ver_Pos, 'r', markersize=2, label="Min") 
ax1.plot(Time, Frac_Ver_Height, 'darkblue', markersize=2, label="Fracture Vertical Height") 
plt.xlabel("Injection time", fontsize=10) 
plt.xlim(0,80) 
plt.ylabel("Fracture Vertical Position (ft)", fontsize=10) 
plt.ylim(-200,400) 
plt.legend(bbox_to_anchor=(.99,.6), prop={'size': 10}) 

ax2=ax1.twinx() 
ax2.plot(Time, Slurry_rate,'m', markersize=2, label="Slurry") 
ax2.plot(Time, Proppant_rate, 'g', markersize=2, label="Proppant") 
plt.ylabel("Injection rate, (BPM))", fontsize=10) 
plt.ylim(0,100) 
plt.legend(bbox_to_anchor=(.82,.775), prop={'size': 10}) 

#Fourth Plot 

ax1=plt.subplot(2,2,4) 
plt.title("Fracture Length") 
ax1.plot(Time, Max_Frac_Trans_Pos, 'b', markersize=2, label="Max") 
ax1.plot(Time, Min_Frac_Trans_Pos, 'r', markersize=2, label="Min") 
ax1.plot(Time, Frac_Trans_Length, 'darkblue', markersize=2, label="Fracture Transversal Length") 
plt.xlabel("Injection time", fontsize=10) 
plt.xlim(0,80) 
plt.ylabel("Fracture Transversal Position (ft)", fontsize=10) 

plt.ticklabel_format(style='sci', axis='x', scilimits=(-2e3,3e3)) #tried, didn't work 
#plt.ylim(-2e3,3e3) #tried, didn't work 

plt.legend(bbox_to_anchor=(.99,.6), prop={'size': 10}) 

ax2=ax1.twinx() 
ax2.plot(Time, Slurry_rate,'m', markersize=2, label="Slurry") 
ax2.plot(Time, Proppant_rate, 'g', markersize=2, label="Proppant") 
plt.ylabel("Injection rate, (BPM))", fontsize=10) 
plt.ylim(0,100) 
plt.legend(bbox_to_anchor=(.82,.775), prop={'size': 10}) 

plt.savefig('side-by-side_09.png', dpi=300) 
#plt.show() 
plt.gcf().clear() 
plt.close('all') 

預先感謝您的幫助！

Answer 1

爲了讓足夠的空間爲標題，你可以保存這個數字前加行

plt.tight_layout() 

。它會優化軸的位置。

要改變軸的偏移，使yticks都出現了1，-1，使用

plt.ticklabel_format(useOffset=1000)