从图中可以看出，xlabel和ylabe超出了绘图区域，不能完全显示出来。在
有人可能会说更改字体大小，但我希望字体大小更大。在
代码如下：from numpy import *
from pylab import *
tduration=3600
if tduration<960:
time=linspace(0,tduration,120)
else:
n=(tduration-960)/480
time1=linspace(0,960,8,endpoint=False)
time2=linspace(960,tduration,n)
time=hstack((time1,time2))
timemin=time/60
T0=20
Tf=T0+345*log10(8*timemin+1)
timetem=column_stack((timemin,Tf))
savetxt("timetem.txt",timetem,newline='\r\n',fmt='%f')
heatingRate=345/(8*timemin+1)
fig,ax1 =subplots()
ax2 = ax1.twinx()
rc('font',family='Times New Roman')
ax1.plot(timemin,Tf,'k',linewidth=3,label='ISO834 fire curve')
ax2.plot(timemin,heatingRate,'b--',linewidth=3,label='heating rate')
ax1.plot(0, 0,'b--', label = 'heating rate',linewidth=3)
leg=ax1.legend(loc='best',fontsize=24)
leg.get_frame().set_alpha(0.0)
ax1.set_ylabel(r"T$(^{\circ}C)$",fontsize=24,fontname="Times New Roman")
ax2.set_ylabel(r"Heating rate($^{\circ}C$/min)",fontsize=24,fontname="Times New Roman")
ax1.set_xlabel("Time(min)",fontsize=24,fontname="Times New Roman")
ax1.tick_params(labelsize=24)
ax2.tick_params(labelsize=24)
ax1.grid()
show()
fig.savefig('iso834 with hr.png', transparent=True)
