def simple():
pgeo = {'o1':0,'d1':0.0608,'n1':15,
'o2':0,'d2':0.0608,'n2':15}
dwav = {'o1':0.0,'d1':0.004,'n1':251}
vel = np.ones((15,15),'f')*2
vmod = lib.rsf2darray(**pgeo)
vmod.put(vel)
wav = lib.rsf1darray(**dwav)
wav.ricker(15.0,0.15)
fftobj = lib.rsffft1(wav,Aunit='Hz',Aname='$f$')
fir = fftobj.fft()
fir.rsf = np.abs(fir.rsf)
sx=0.12
sz=0.02
h_obj = lib.helmhotz(vmod,wav,sx,sz,nw=1,N=5,f=10.,free=True)
h_obj.solve()
matrix = h_obj.lhs(13.0)
fig = plt2.figure(11,figsize=(10,5))
ax = fig.add_subplot(111)
ax.imshow(matrix.todense().real)
def goPluto(fn=1):
'''
This function produces the response at
f = 10Hz for the Pluto synthetic model, which
mimics the marine geology of the Gulf of Mexico.
'''
pgeo = {'o1':0,'d1':0.0608,'n1':15,
'o2':0,'d2':0.0608,'n2':15}
dwav = {'o1':0.0,'d1':0.004,'n1':251}
pluto = lib.rsf2darray(**pgeo)
vel = np.ones((pgeo['n2'],pgeo['n1']),'f')*2.0
for i1 in range(pgeo['n2']):
if i1>7:
vel[i1,:] *= 1.5
#pluto.read('plutovel@')
pluto.put(vel)
plt.plotvel(pluto,fn=fn)
wav = lib.rsf1darray(**dwav)
wav.ricker(15.0,0.15)
plt.plot1d(wav,fn=fn+1)
fftobj = lib.rsffft1(wav,Aunit='Hz',Aname='$f$')
fir = fftobj.fft()
fir.rsf = np.abs(fir.rsf)
plt.plot1d(fir,fn=fn+2)
par = pgeo.copy()
sx,sz = par['n2']*0.5*par['d2'] , par['n1']*0.5*par['d1']
h_obj = lib.helmhotz(pluto,wav,sx,sz,nw=1,N=11,f=10.,free=True)
u = h_obj.solve()
wavefield = lib.rsf2darray(**pgeo)
wavefield.put(u[0])
plt.plotwavefield(wavefield,fn=fn+3,s=0.15)
h_obj = lib.helmhotz(pluto,wav,sx,sz,nw=1,N=5,f=10.,free=False)
u = h_obj.solve()
wavefield = lib.rsf2darray(**pgeo)
wavefield.put(u[0])
plt.plotwavefield(wavefield,fn=fn+10,s=0.15)
A = h_obj.returnA()
fig = plt2.figure(20,figsize=(10,5))
ax = fig.add_subplot(111)
im = ax.imshow(A.todense().real)
divider = make_axes_locatable(ax)
cax = divider.append_axes("right", size="2%", pad=0.05)
cb = fig.colorbar(im,cax=cax)
def goImpulse(d=2,fn=1,morder=12,fname=None):
diff = []*3
order = range(2,morder+1,2)
i=0
ir = lib.rsf1darray(0,1,200)
for o in order:
diff = lib.Diff(order=d,n=o+1,h=1.)
i+=1
a = np.zeros(201)
a[100] = 1.
ir.rsf = np.convolve(a,diff.filter(),mode='same')
fftobj = lib.rsffft1(ir)
fir = fftobj.fft()
fir.rsf = np.abs(fir.rsf)
plt.plot1d(fir,fn=fn)
fir.rsf = (fir.grid()*2.*np.pi)**d
plt.plot1d(fir,fn=fn,fname=fname)
def goPluto(fn=1):
'''
This function produces the response at
f = 10Hz for the Pluto synthetic model, which
mimics the marine geology of the Gulf of Mexico.
'''
pgeo = {'o1':0,'d1':0.0608,'n1':125,
'o2':0,'d2':0.0608,'n2':527}
dwav = {'o1':0.0,'d1':0.004,'n1':251}
pluto = lib.rsf2darray(**pgeo)
pluto.read('plutovel@')
plt.plotvel(pluto,fn=fn,fname=dirFig+'Pluto.pdf')
wav = lib.rsf1darray(**dwav)
wav.ricker(15.0,0.15)
plt.plot1d(wav,fn=fn+1,fname=dirFig+'twav.pdf')
fftobj = lib.rsffft1(wav,Aunit='Hz',Aname='$f$')
fir = fftobj.fft()
fir.rsf = np.abs(fir.rsf)
plt.plot1d(fir,fn=fn+2,fname=dirFig+'wwav.pdf')
sx,sz = 16., 0.05
h_obj = lib.helmhotz(pluto,wav,sx,sz,nw=1,N=5,f=10.,free=True)
u = h_obj.solve()
wavefield = lib.rsf2darray(**pgeo)
wavefield.put(u[0])
plt.plotwavefield(wavefield,fn=fn+3,s=0.15,fname=dirFig+'free10Hz.pdf')
h_obj = lib.helmhotz(pluto,wav,sx,sz,nw=1,N=5,f=10.,free=False)
u = h_obj.solve()
wavefield = lib.rsf2darray(**pgeo)
wavefield.put(u[0])
plt.plotwavefield(wavefield,fn=fn+10,s=0.15,fname=dirFig+'abc10Hz.pdf')