在标签中混合乳胶符号和串联

Question

我试图根据参数（alpha）绘制函数的多次迭代，并且我想将参数的值传递给标签，以便标签看起来像alpha = 0.5。这样做就可以了，但是我希望用真实的Alpha（即LateX符号）来呈现Alpha参数。我怎样才能做到这一点？

这是代码：

#***************

#* Phase angle *    

#***************

def phase_angle(alpha,f_act,f_res):

    phi = numpy.arctan2(2*alpha*(f_act/f_res),(1-(f_act/f_res)**2))

    return phi

#**************************

#* Setting the Parameters *

#**************************

f_min = 1

f_max = 200

f_eig = 75

df=.1

alpha =[0.01,0.05,0.5,1]

#******************

#* Initialization *

#******************

f = numpy.arange(f_min,f_max,df)

Freq = f/f_eig

#************************************

#* Plotting the curve for the phase *

#************************************

# Publishable quality image

ps.set_mode("beamer")

# Plotting the curve for the kinematics

fig = pylab.figure()

host = fig.add_subplot(111)

host.set_title('Typical phase response of a resonant system')

for alpha_i in alpha:

    Phase = phase_angle(alpha_i,f,f_eig)

    host.plot(Freq, Phase, label='\alpha=' + str(alpha_i), linewidth=2)

host.axvline(x=1, linewidth=1.5, color='b')

host.set_xlabel(r"Adimensioned frequency $f$/$f_{wing}$ [$-$]")

host.set_ylabel(r"Phase response $\phi$ [$rad$]")

Phase_pi   = Phase/numpy.pi

y_tick = numpy.arange(0,1.5,0.5)

y_label = [r"$0$", r"$+\frac{\pi}{2}$",   r"$+\pi$"]

host.set_yticks(y_tick*numpy.pi)

host.set_yticklabels(y_label, fontsize=20)

host.set_xlim(0,2.5)

host.set_ylim(top=numpy.pi)

pylab.legend(loc=0)

pylab.tight_layout()

pylab.show()

我认为python在连接时会感到困惑。有什么想法吗？

Answer 1

使用字符串格式（记住您的$）for alpha_i in alpha:    Phase = phase_angle(alpha_i,f,f_eig)    host.plot(Freq, Phase, label=r'$\alpha = {0}$'.format(alpha_i), linewidth=2)