Python pylab.exp函数代码示例

    def diagnostic(self, kmin=1, kmax=8, k=None, ymax=None):
        self.run(kmin=kmin, kmax=kmax); 
        pylab.clf()
        pylab.subplot(3,1,2);
        self.plot()
        mf = GaussianMixtureFitting(self.fitting.data)
        if k is None:
            mf.estimate(k=self.best_k)
        else:
            mf.estimate(k=k)
        pylab.subplot(3,1,1)
        mf.plot()
        if ymax is not None:
            pylab.ylim([0, ymax])

        pylab.subplot(3,1,3)
        min_value = np.array([self.all_results[x]['AICc'] for x in self.x]).min()
        pylab.plot(self.x, [pylab.exp((min_value-self.all_results[k]['AICc'])/2)
            for k in  self.x], 'o-', label='AICc')
        min_value = np.array([self.all_results[x]['AIC'] for x in self.x]).min()
        pylab.plot(self.x, [pylab.exp((min_value-self.all_results[k]['AIC'])/2)
            for k in  self.x], 'o-', label='AIC')
        
        pylab.xlabel('probability of information loss (based on AICc')
        pylab.legend()

def test_covariate_model_dispersion():
    # simulate normal data
    n = 100

    model = data.ModelData()
    model.hierarchy, model.output_template = data_simulation.small_output()

    Z = mc.rcategorical([.5, 5.], n)
    zeta_true = -.2

    pi_true = .1
    ess = 10000.*pl.ones(n)
    eta_true = pl.log(50)
    delta_true = 50 + pl.exp(eta_true)

    p = mc.rnegative_binomial(pi_true*ess, delta_true*pl.exp(Z*zeta_true)) / ess

    
    model.input_data = pandas.DataFrame(dict(value=p, z_0=Z))
    model.input_data['area'] = 'all'
    model.input_data['sex'] = 'total'
    model.input_data['year_start'] = 2000
    model.input_data['year_end'] = 2000



    # create model and priors
    vars = dict(mu=mc.Uninformative('mu_test', value=pi_true))
    vars.update(covariate_model.mean_covariate_model('test', vars['mu'], model.input_data, {}, model, 'all', 'total', 'all'))
    vars.update(covariate_model.dispersion_covariate_model('test', model.input_data, .1, 10.))
    vars.update(rate_model.neg_binom_model('test', vars['pi'], vars['delta'], p, ess))

    # fit model
    m = mc.MCMC(vars)
    m.sample(2)

def duxbury_cdf(X,L,s):
	"""
	Returns the duxbury cdf evaluated at X.
	The duxbury CDF is 1 - exp( -(L^2)*exp( - (s/x)^2 ) )
	"""
	
	return 1 - pylab.exp( -L*L*pylab.exp( -((s/X)**2.0) )) 

def calcAUC(data, y0, lag, mgr, asym, time):
    """
    Calculate the area under the curve of the logistic function
    using its integrated formula
    [ A( [A-y0] log[ exp( [4m(l-t)/A]+2 )+1 ]) / 4m ] + At
    """

    # First check that max growth rate is not zero
    # If so, calculate using the data instead of the equation
    if mgr == 0:
        auc = calcAUCData(data, time)
    else:
        timeS = time[0]
        timeE = time[-1]
        t1 = asym - y0
        #try:
        t2_s = py.log(py.exp((4 * mgr * (lag - timeS) / asym) + 2) + 1)
        t2_e = py.log(py.exp((4 * mgr * (lag - timeE) / asym) + 2) + 1)
        #except RuntimeWarning as rw:
            # Exponent is too large, setting to 10^3
        #    newexp = 1000
        #    t2_s = py.log(newexp + 1)
        #    t2_e = py.log(newexp + 1)
        t3 = 4 * mgr
        t4_s = asym * timeS
        t4_e = asym * timeE

        start = (asym * (t1 * t2_s) / t3) + t4_s
        end = (asym * (t1 * t2_e) / t3) + t4_e
        auc = end - start

    if py.absolute(auc) == float('Inf'):
        x = py.diff(time)
        auc = py.sum(x * data[1:])
    return auc

 def fresnelSingleTransformFW(self,d) :
     i2 = Intensity2D(self.nx,self.startx,self.endx,
                      self.ny,self.starty,self.endy,
                      self.wl)
     u1p   = self.i*pl.exp(-1j*pl.pi/(d*self.wl)*(self.xgrid**2+self.ygrid**2))
     ftu1p = pl.fftshift(pl.fft2(pl.fftshift(u1p)))
     i2.i  = ftu1p*1j/(d*self.wl)*pl.exp(-1j*pl.pi/(d*self.wl)*(self.xgrid**2+self.ygrid**2))
     return i2

 def wave_gen(self,ploti=1):
     if self.wave_type=="pulse":
         self.wave_origin=p.exp(-5e-2*(p.arange(self.iter_total)-20)**2)
     elif self.wave_type=="sine":
         self.wave_origin=(1-p.exp(-1e-7*(p.arange(self.iter_total))))*p.sin(2*p.pi*p.arange(self.iter_total)/(20))
     
     if ploti==1:
         p.figure(3)
         p.plot(self.wave_origin)

def beta(v, gate):
   """
   backward rate of the Hudgkin-Huxley potassium gate
   """
   if gate=='n':
      return 0.125 * p.exp( (v+65)/-80. )
   elif gate=='m':
      return 4 * p.exp(-(v+65) / 18)
   elif gate=='h':
      return 1 / (1 + p.exp( -(v+35) / 10 ))

def plot_jp_tmax_surf(mu,c,phi,pmax,smax,ks):
    # @brief tau max based on varying slip rate, normal pressure
    s_dot = py.arange(0,smax,smax/100.)
    prange = py.arange(0,pmax,pmax/100.)
    kap = 1-py.exp(-s_dot/ks)   #  kappa
    
    TMAX = py.zeros((len(kap),len(prange)))
    tphi = py.tan(phi)  # keep tan(phi) handy
    for k_i in range(0,len(kap)):
        k_tmp = kap[k_i]    
        for p_j in range(0,len(prange)):
            p_tmp = prange[p_j]
            TMAX[k_i][p_j] = k_tmp*(c+p_tmp*tphi) + (1-k_tmp)*p_tmp*mu
            
    fig = plt.figure()           
    ax = fig.add_subplot(121)
    # should be ok to plot the surface
    S, P = py.meshgrid(s_dot, prange)
    CS = plt.contour(S,P,TMAX,8,colors='k',linewidths=1.5)
    plt.clabel(CS,inlne=1,fontsize=16)
    img = plt.imshow(TMAX, interpolation='bilinear', origin='lower',
                     cmap=cm.jet,extent=(min(s_dot),max(s_dot),min(prange),max(prange)))
    CBI = plt.colorbar(img, orientation='vertical',shrink=0.8)
    CBI.set_label(r'$\tau ,max $[psi]')
    ax.set_title(r'$\tau ,max = f(\sigma,\kappa), ks=%.2f $'%ks)
    ax.set_xlabel('slip rate [in/sec]')
    ax.set_ylabel(r'$\sigma_z $',size=24)
    
    # use twice ks, re-calc what's necessary, then replot
    ks2 = ks * 2
    kap2 = 1-py.exp(-s_dot/ks2)
    
    TMAX2 = py.zeros((len(kap2),len(prange)))
    # tphi = py.tan(phi)  # keep tan(phi) handy
    for k_i in range(0,len(kap2)):
        k2_tmp = kap2[k_i]    
        for p_j in range(0,len(prange)):
            p_tmp = prange[p_j]
            TMAX2[k_i][p_j] = k2_tmp*(c+p_tmp*tphi) + (1-k2_tmp)*p_tmp*mu
            
    
    #fig = plt.figure()           
    ax = fig.add_subplot(122)
    # should be ok to plot the surface
    # S, P = py.meshgrid(s_dot, prange)
    CS2 = plt.contour(S,P,TMAX2,8,colors='k',linewidths=1.5)
    plt.clabel(CS2,inlne=1,fontsize=16)
    img2 = plt.imshow(TMAX2, interpolation='bilinear', origin='lower',
                     cmap=cm.jet,extent=(min(s_dot),max(s_dot),min(prange),max(prange)))
    CBI2 = plt.colorbar(img2, orientation='vertical',shrink=0.8)
    CBI2.set_label(r'$\tau ,max $[psi]')
    ax.set_title(r'$\tau ,max = f(\sigma,\kappa), ks=%.2f $'%ks2)
    ax.set_xlabel('slip rate [in/sec]')
    ax.set_ylabel(r'$\sigma_z $',size=24)

def alpha(v,gate):
   """
   forward rate of the Hudgkin-Huxley potassium gate
   """
   if gate=='n':
      v_centered = v + 55
      return 0.01 * v_centered / (1 - p.exp(-v_centered/10.))
   elif gate=='m':
      return 0.1 * (v + 40) / (1 - p.exp( -(v + 40)/10))
   elif gate=='h':
      return 0.07 * p.exp( - (v + 65) / 20)

def test_predict_for_wo_data():
    """ Approach to testing predict_for function:

    1. Create model with known mu_age, known covariate values, known effect coefficients
    2. Setup MCMC with NoStepper for all stochs
    3. Sample to generate trace with known values
    4. Predict for results, and confirm that they match expected values
    """
    
    
    d = data.ModelData()
    d.hierarchy, d.output_template = data_simulation.small_output()


    # create model and priors
    vars = ism.age_specific_rate(d, 'p', 'all', 'total', 'all', None, None, None)

    # fit model
    m = mc.MCMC(vars)
    m.sample(1)


    ### Prediction case 1: constant zero random effects, zero fixed effect coefficients

    # check estimates with priors on random effects
    d.parameters['p']['random_effects'] = {}
    for node in ['USA', 'NAHI', 'super-region-1', 'all']:
        d.parameters['p']['random_effects'][node] = dict(dist='Constant', mu=0, sigma=1.e-9) # zero out REs to see if test passes
        
    pred = covariate_model.predict_for(d, d.parameters['p'],
                                         'all', 'total', 'all',
                                         'USA', 'male', 1990,
                                         0., vars['p'], 0., pl.inf)


    ### Prediction case 2: constant non-zero random effects, zero fixed effect coefficients
    # FIXME: this test was failing because PyMC is drawing from the prior of beta[0] even though I asked for NoStepper
                                                      
    # check estimates with priors on random effects
    for i, node in enumerate(['USA', 'NAHI', 'super-region-1']):
        d.parameters['p']['random_effects'][node]['mu'] = (i+1.)/10.
        
    pred = covariate_model.predict_for(d, d.parameters['p'],
                                         'all', 'total', 'all',
                                         'USA', 'male', 1990,
                                         0., vars['p'], 0., pl.inf)

    # test that the predicted value is as expected
    fe_usa_1990 = pl.exp(.5*vars['p']['beta'][0].value) # beta[0] is drawn from prior, even though I set it to NoStepper, see FIXME above
    re_usa_1990 = pl.exp(.1+.2+.3)
    assert_almost_equal(pred,
                        vars['p']['mu_age'].trace() * fe_usa_1990 * re_usa_1990)

    def fresnelSingleTransformVW(self,d) :
        # compute new window
        x2 = self.nx*pl.absolute(d)*self.wl/(self.endx-self.startx)
        y2 = self.ny*pl.absolute(d)*self.wl/(self.endy-self.starty)

        # create new intensity object
        i2 = Intensity2D(self.nx,-x2/2,x2/2,
                         self.ny,-y2/2,y2/2,
                         self.wl)

        # compute intensity
        u1p   = self.i*pl.exp(-1j*pl.pi/(d*self.wl)*(self.xgrid**2+self.ygrid**2))
        ftu1p = pl.fftshift(pl.fft2(pl.fftshift(u1p)))
        i2.i  = ftu1p*1j/(d*i2.wl)*pl.exp(-1j*pl.pi/(d*i2.wl)*(i2.xgrid**2+i2.ygrid**2))
        return i2

def Fraunhofer(i, z) :
    print "Propagation:Fraunhofer"
    ft = pl.fftshift(pl.fftn(pl.fftshift(i.i)))
    dx = i.wl*z/(i.nx*i.dx)
    dy = i.wl*z/(i.ny*i.dy)
    po = pl.exp(1j*2*pl.pi/i.wl*i.dx*i.dx)/(1j*i.wl*z)
    p = pl.arange(0,i.nx)-(i.nx+0.5)/2.0
    q = pl.arange(0,i.ny)-(i.ny+0.5)/2.0
    [pp,qq] = pl.meshgrid(p,q)
    pm = pl.exp(1j*pl.pi/(i.wl*z)*((pp*dx)**2+(qq*dy)**2))
    i2 = Intensity.Intensity2D(i.nx,-i.nx*dx/2,i.nx*dy/2,i.ny,-i.ny*dy/2,i.ny*dy/2)
    i2.i = po*pm*ft
    return i2
    
    print "Propagation:Fraunhofer>",dx,dy,i.nx*dx,i.ny*dy

def gaussian(x,c,w):
	""" Analytic Gaussian function with amplitude 'a', center 'c', width 'w'.
		The FWHM of this fn is 2*sqrt(2*log(2))*w 
		NOT NORMALISED """
	G = exp(-(x-c)**2/(2*w**2))
	G /= G.max()
	return G

def test_fixed_effect_priors():
    model = data.ModelData()

    # set prior on sex
    parameters = dict(fixed_effects={'x_sex': dict(dist='TruncatedNormal', mu=1., sigma=.5, lower=-10, upper=10)})

    # simulate normal data
    n = 32.
    sex_list = pl.array(['male', 'female', 'total'])
    sex = sex_list[mc.rcategorical([.3, .3, .4], n)]
    beta_true = dict(male=-1., total=0., female=1.)
    pi_true = pl.exp([beta_true[s] for s in sex])
    sigma_true = .05
    p = mc.rnormal(pi_true, 1./sigma_true**2.)

    model.input_data = pandas.DataFrame(dict(value=p, sex=sex))
    model.input_data['area'] = 'all'
    model.input_data['year_start'] = 2010
    model.input_data['year_start'] = 2010



    # create model and priors
    vars = {}
    vars.update(covariate_model.mean_covariate_model('test', 1, model.input_data, parameters, model,
                                                     'all', 'total', 'all'))

    print vars['beta']
    assert vars['beta'][0].parents['mu'] == 1.

def test_covariate_model_sim_no_hierarchy():
    # simulate normal data
    model = data.ModelData()
    model.hierarchy, model.output_template = data_simulation.small_output()

    X = mc.rnormal(0., 1.**2, size=(128,3))

    beta_true = [-.1, .1, .2]
    Y_true = pl.dot(X, beta_true)

    pi_true = pl.exp(Y_true)
    sigma_true = .01*pl.ones_like(pi_true)

    p = mc.rnormal(pi_true, 1./sigma_true**2.)

    model.input_data = pandas.DataFrame(dict(value=p, x_0=X[:,0], x_1=X[:,1], x_2=X[:,2]))
    model.input_data['area'] = 'all'
    model.input_data['sex'] = 'total'
    model.input_data['year_start'] = 2000
    model.input_data['year_end'] = 2000

    # create model and priors
    vars = {}
    vars.update(covariate_model.mean_covariate_model('test', 1, model.input_data, {}, model, 'all', 'total', 'all'))
    vars.update(rate_model.normal_model('test', vars['pi'], 0., p, sigma_true))

    # fit model
    m = mc.MCMC(vars)
    m.sample(2)