diff --git a/example/calcul_pressure-lagrangien-2-eulerien-patch-correctif.py b/example/calcul_pressure-lagrangien-2-eulerien-patch-correctif.py
new file mode 100644
index 0000000000000000000000000000000000000000..a7d953753876e85ac0669bb069917ca596861397
--- /dev/null
+++ b/example/calcul_pressure-lagrangien-2-eulerien-patch-correctif.py
@@ -0,0 +1,186 @@
+#!/usr/bin/python
+
+import sys
+import numpy as np
+import netCDF4 as nc
+from numpy import arange, dtype
+import math
+
+#*******************************************************************************
+def main(args):
+
+ """USE
+ {0} mask.nc input.nc output.nc
+
+DESCRIPTION
+ Computes pressure from density and e3t (that changes with SSH).
+
+"""
+ if len(args)<6 or args[1]=='-h' or args[1]=='--help':
+ print( main.func_doc.format(args[0]) )
+ return 0
+
+
+
+#===============================================================================
+# input
+#===============================================================================
+
+ file_pressure = args[1]
+ fichierpression = nc.Dataset(file_pressure)
+
+ pbc_a=fichierpression.variables['Pbc_a'][:,:,:]
+ pbc_G=fichierpression.variables['Pbc_G'][:,:,:]
+ depth=fichierpression.variables['dept'][:]
+ lon=fichierpression.variables['lont'][:]
+ lat=fichierpression.variables['latt'][:]
+
+ file_ssh = args[2]
+ fichierssh = nc.Dataset(file_ssh)
+
+ ssh_a=fichierssh.variables['ssh_a'][:,:]
+ ssh_G=fichierssh.variables['ssh_G'][:,:]
+
+ jj=pbc_a.shape[1]
+ ii=pbc_a.shape[2]
+ kk=pbc_a.shape[0]
+
+ file_mean = args[3]
+ fichierrhop = nc.Dataset(file_mean)
+ rhop_m=fichierrhop.variables['rhop_mean'][0,:,:]
+
+ file_mask = args[5]
+ fichiermask = nc.Dataset(file_mask)
+ gdepw=fichiermask.variables['gdepw'][0,:,:,:]
+ gdept_0_all=fichiermask.variables['gdept_0'][0,74,:,:]
+ gdept_0=fichiermask.variables['gdept_0'][0,0,:,:]
+ tmask = fichiermask.variables['tmask'][0, :, :, :]
+
+
+
+
+#===============================================================================
+# output
+#===============================================================================
+
+ p_file=args[4]
+ print('Creating '+p_file)
+
+ # this will overwrite the file
+ ncfile = nc.Dataset(p_file,'w', format='NETCDF3_CLASSIC')
+ setattr(ncfile,'history',' '.join(args))
+ ncfile.createDimension('x',ii)
+ ncfile.createDimension('y',jj)
+ ncfile.createDimension('dept',kk)
+
+
+ data = ncfile.createVariable('lont',dtype('float64').char,('y','x'))
+ data[:] = lon
+ setattr(data, 'units',"degrees_north")
+ setattr(data, 'standard_name',"longitude_at_T_location")
+
+ data = ncfile.createVariable('latt',dtype('float64').char,('y','x'))
+ data[:] = lat
+ setattr(data, 'units',"degrees_east")
+ setattr(data, 'standard_name',"latitude_at_T_location")
+
+ data = ncfile.createVariable('dept',dtype('float64').char,('dept'))
+ data[:] = depth
+ setattr(data, 'units',"m")
+ setattr(data, 'positive',"down")
+ setattr(data, 'standard_name',"depth_at_T_location")
+ setattr(data, 'axis',"Z")
+
+ p_corr_a = ncfile.createVariable('P_corr_A',dtype('float32').char,('dept','y','x'))
+ setattr(p_corr_a, 'standard_name',"Amplitude Of Pressure Total")
+ setattr(p_corr_a, 'units',"m-1.kg.s-2")
+ setattr(p_corr_a, 'coordinates', "dept latt lont")
+
+ p_corr_G = ncfile.createVariable('P_corr_G',dtype('float32').char,('dept','y','x'))
+ setattr(p_corr_G, 'standard_name',"Phase Of Pressure Total")
+ setattr(p_corr_G, 'units',"m-1.kg.s-2")
+ setattr(p_corr_G, 'coordinates', "dept latt lont")
+
+#===============================================================================
+# process
+#===============================================================================
+
+ print( 'Dimensions: kk={} jj={} ii={} '.format(kk,jj,ii) )
+
+ p_zr = np.zeros(shape=(kk,jj,ii))
+ p_zi = np.zeros(shape=(kk,jj,ii))
+
+ ssh_zr = np.zeros(shape=(jj,ii))
+ ssh_zi = np.zeros(shape=(jj,ii))
+
+ grav=9.81
+
+
+ for k in range (0,75):
+ for j in range (0,484):
+ for i in range (0,388):
+
+ if math.isnan(pbc_a[k, j, i])==True:
+ p_zr[k, j, i] == np.NaN;
+ p_zi[k, j, i] == np.NaN;
+ else:
+ p_zr[k, j, i]=pbc_a[k, j, i]*math.cos(math.radians(pbc_G[k, j, i]))
+ p_zi[k, j, i]=pbc_a[k, j, i]*math.sin(math.radians(pbc_G[k, j, i]))
+
+ for j in range (0,484):
+ for i in range (0,388):
+
+ if math.isnan(ssh_a[j, i])==True:
+ ssh_zr[j, i] == np.NaN;
+ ssh_zi[j, i] == np.NaN;
+ else:
+ ssh_zr[j, i]=ssh_a[j, i]*math.cos(math.radians(ssh_G[j, i]))
+ ssh_zi[j, i]=ssh_a[j, i]*math.sin(math.radians(ssh_G[j, i]))
+
+ p_corr_zr = np.zeros(shape=(kk,jj,ii))
+ p_corr_zi = np.zeros(shape=(kk,jj,ii))
+ zz = np.zeros(shape=(jj,ii))
+
+ for k in range (0,75):
+ for j in range(0, 484):
+ for i in range(0, 388):
+
+ zz[j, i] = (0.5 * gdept_0[j,i]) + gdepw[k, j, i]
+ p_corr_zr[k, j, i] = p_zr[k, j, i] + grav * rhop_m[j, i] * ssh_zr[j, i] * ((gdept_0_all[j,i] - zz[j,i]) / gdept_0_all[j,i])
+ p_corr_zi[k, j, i] = p_zi[k, j, i] + grav * rhop_m[j, i] * ssh_zi[j, i] * ((gdept_0_all[j,i] - zz[j,i]) / gdept_0_all[j,i])
+
+
+ p_a = np.zeros(shape=(kk,jj,ii))
+ p_G = np.zeros(shape=(kk,jj,ii))
+
+
+ for k in range (0,75):
+ for j in range (0,484):
+ for i in range (0,388):
+ p_a[k, j, i] = (p_corr_zr[k, j, i] * p_corr_zr[k, j, i] + p_corr_zi[k, j, i] * p_corr_zi[k, j, i])**(0.5)
+ p_G[k, j, i] = math.degrees(math.atan2(p_corr_zi[k, j, i], p_corr_zr[k, j, i]))
+
+ p_a[tmask == 0] = nc.default_fillvals['f4']
+ p_G[tmask == 0] = nc.default_fillvals['f4']
+ p_corr_a[:,:,:] = p_a
+ p_corr_G[:,:,:] = p_G
+
+
+
+
+#===============================================================================
+# clean-up
+#===============================================================================
+
+ fichierpression.close()
+ fichierssh.close()
+ fichierrhop.close()
+ fichiermask.close()
+ ncfile.close()
+
+
+#*******************************************************************************
+if __name__ == '__main__':
+ #file:///usr/share/doc/packages/python/html/python-2.7-docs-html/library/sys.html#sys.exit
+ sys.exit(main(sys.argv))
+
diff --git a/example/calcul_pressure-lagrangien.py b/example/calcul_pressure-lagrangien.py
new file mode 100644
index 0000000000000000000000000000000000000000..5f01e81bcdfff26f390f1b32dea5d84a109549a6
--- /dev/null
+++ b/example/calcul_pressure-lagrangien.py
@@ -0,0 +1,138 @@
+#!/usr/bin/python
+
+import sys
+import numpy as np
+import netCDF4 as nc
+from numpy import arange, dtype
+
+#*******************************************************************************
+def main(args):
+
+ """USE
+ {0} mask.nc input.nc output.nc
+
+DESCRIPTION
+ Computes pressure from density and e3t (that changes with SSH).
+
+"""
+ if len(args)<4 or args[1]=='-h' or args[1]=='--help':
+ print( main.func_doc.format(args[0]) )
+ return 0
+
+# ===============================================================================
+# mask file
+# ===============================================================================
+
+ fichiermask=args[1]
+
+ mask_file=nc.Dataset(fichiermask)
+ depth=mask_file.variables['gdept_1d'][:]
+ tmask=mask_file.variables['tmask'][0,:,:,:]
+ mask_file.close()
+
+#===============================================================================
+# input
+#===============================================================================
+
+ fichierjulien=args[2]
+ lefichier = nc.Dataset(fichierjulien)
+
+ e3tv=lefichier.variables['e3t']
+ ji=e3tv.shape[3]
+ jj=e3tv.shape[2]
+ jk=e3tv.shape[1]
+ jl=e3tv.shape[0]
+
+ e3wv=lefichier.variables['e3w']
+ rhopv=lefichier.variables['rhop']
+ itv=lefichier.variables['time_counter']
+
+ lon=lefichier.variables['nav_lon_grid_T'][:]
+ lat=lefichier.variables['nav_lat_grid_T'][:]
+
+#===============================================================================
+# output
+#===============================================================================
+
+ p_file=args[3]
+ print('Creating '+p_file)
+
+ # this will overwrite the file
+ ncfile = nc.Dataset(p_file,'w', format='NETCDF3_CLASSIC')
+ setattr(ncfile,'history',' '.join(args))
+ ncfile.createDimension('x',ji)
+ ncfile.createDimension('y',jj)
+ ncfile.createDimension('dept',jk)
+ ncfile.createDimension('time') # unlimited
+
+ data = ncfile.createVariable('lont',dtype('float64').char,('y','x'))
+ data[:] = lon
+ setattr(data, 'units',"degrees_north")
+ setattr(data, 'standard_name',"longitude_at_T_location")
+
+ data = ncfile.createVariable('latt',dtype('float64').char,('y','x'))
+ data[:] = lat
+ setattr(data, 'units',"degrees_east")
+ setattr(data, 'standard_name',"latitude_at_T_location")
+
+ data = ncfile.createVariable('dept',dtype('float64').char,('dept'))
+ data[:] = depth
+ setattr(data, 'units',"m")
+ setattr(data, 'positive',"down")
+ setattr(data, 'standard_name',"depth_at_T_location")
+ setattr(data, 'axis',"Z")
+
+ otv = ncfile.createVariable('time',dtype('float64').char,('time'))
+ setattr(otv, 'units',itv.units)
+ setattr(otv, 'standard_name',"time")
+ setattr(otv, 'axis',"T")
+
+ pv = ncfile.createVariable('Pbc',dtype('float32').char,('time','dept','y','x'))
+ setattr(pv, 'standard_name',"Amplitude Of Pressure Total")
+ setattr(pv, 'units',"m-1.kg.s-2")
+ setattr(pv, 'coordinates', "time dept latt lont")
+
+#===============================================================================
+# process
+#===============================================================================
+
+ print( 'Dimensions: jl={} jk={} jj={} ji={}'.format(jl,jk,jj,ji) )
+
+ p_bc=np.zeros(shape=(jk,jj,ji))
+
+ grav=9.81
+
+ for l in range(0,jl):
+
+ time=itv[l]
+ print( 'Time frame {}/{}'.format(l,jl) )
+
+ e3t=e3tv[l, 0, :, :]
+ e3w=e3wv[l, :, :, :]
+ rhop=rhopv[l, :, :, :]
+
+ for k in range(0,jk):
+ if k==0:
+ p0=0.5*grav*e3t*rhop[k,:,:]
+ else:
+ p0+=0.5*grav*e3w[k,:,:]*(rhop[k,:,:]+rhop[k-1,:,:])
+
+ p0*=tmask[k,:,:]
+ p_bc[k,:,:]=p0
+
+ p_bc[tmask==0]=nc.default_fillvals['f4']
+ pv[l,:,:,:] = p_bc
+ otv[l] = time
+
+#===============================================================================
+# clean-up
+#===============================================================================
+
+ lefichier.close()
+ ncfile.close()
+
+
+#*******************************************************************************
+if __name__ == '__main__':
+ #file:///usr/share/doc/packages/python/html/python-2.7-docs-html/library/sys.html#sys.exit
+ sys.exit(main(sys.argv))
diff --git a/example/calcul_pressure_eulerien.py b/example/calcul_pressure_eulerien.py
new file mode 100644
index 0000000000000000000000000000000000000000..4c39d629fb103f4a3942b459f53fa12b82c6b023
--- /dev/null
+++ b/example/calcul_pressure_eulerien.py
@@ -0,0 +1,143 @@
+#!/usr/bin/python
+
+import sys
+import numpy as np
+import netCDF4 as nc
+from numpy import arange, dtype
+
+#*******************************************************************************
+def main(args):
+
+ """USE
+ {0} mask.nc input.nc output.nc
+
+DESCRIPTION
+ Computes pressure from density and e3t (that changes with SSH).
+
+"""
+ if len(args)<4 or args[1]=='-h' or args[1]=='--help':
+ print( main.func_doc.format(args[0]) )
+ return 0
+
+# ===============================================================================
+# mask file
+# ===============================================================================
+
+ fichiermask=args[1]
+
+ mask_file=nc.Dataset(fichiermask)
+ depth=mask_file.variables['gdept_1d'][:]
+ tmask=mask_file.variables['tmask'][0,:,:,:]
+ e3t = mask_file.variables['e3t'][:,:,:,:]
+ e3w = mask_file.variables['e3w'][:,:,:,:]
+ mask_file.close()
+
+#===============================================================================
+# input
+#===============================================================================
+
+ fichierjulien=args[2]
+ lefichier = nc.Dataset(fichierjulien)
+
+ rhopv = lefichier.variables['rhop']
+ ji=rhopv.shape[3]
+ jj=rhopv.shape[2]
+ jk=rhopv.shape[1]
+ jl=rhopv.shape[0]
+
+ ssh1 = lefichier.variables['ssh']
+
+
+
+ itv=lefichier.variables['time_counter']
+
+ lon=lefichier.variables['nav_lon_grid_T'][:]
+ lat=lefichier.variables['nav_lat_grid_T'][:]
+
+#===============================================================================
+# output
+#===============================================================================
+
+ p_file=args[3]
+ print('Creating '+p_file)
+
+ # this will overwrite the file
+ ncfile = nc.Dataset(p_file,'w', format='NETCDF3_CLASSIC')
+ setattr(ncfile,'history',' '.join(args))
+ ncfile.createDimension('x',ji)
+ ncfile.createDimension('y',jj)
+ ncfile.createDimension('dept',jk)
+ ncfile.createDimension('time') # unlimited
+
+ data = ncfile.createVariable('lont',dtype('float64').char,('y','x'))
+ data[:] = lon
+ setattr(data, 'units',"degrees_north")
+ setattr(data, 'standard_name',"longitude_at_T_location")
+
+ data = ncfile.createVariable('latt',dtype('float64').char,('y','x'))
+ data[:] = lat
+ setattr(data, 'units',"degrees_east")
+ setattr(data, 'standard_name',"latitude_at_T_location")
+
+ data = ncfile.createVariable('dept',dtype('float64').char,('dept'))
+ data[:] = depth
+ setattr(data, 'units',"m")
+ setattr(data, 'positive',"down")
+ setattr(data, 'standard_name',"depth_at_T_location")
+ setattr(data, 'axis',"Z")
+
+ otv = ncfile.createVariable('time',dtype('float64').char,('time'))
+ setattr(otv, 'units',itv.units)
+ setattr(otv, 'standard_name',"time")
+ setattr(otv, 'axis',"T")
+
+ pv = ncfile.createVariable('Ptot',dtype('float32').char,('time','dept','y','x'))
+ setattr(pv, 'standard_name',"Amplitude Of Pressure Total")
+ setattr(pv, 'units',"m-1.kg.s-2")
+ setattr(pv, 'coordinates', "time dept latt lont")
+
+#===============================================================================
+# process
+#===============================================================================
+
+ print( 'Dimensions: jl={} jk={} jj={} ji={}'.format(jl,jk,jj,ji) )
+
+ p_tot=np.zeros(shape=(jk,jj,ji))
+
+ grav=9.81
+
+ for l in range(0,jl):
+
+ time=itv[l]
+ print( 'Time frame {}/{}'.format(l,jl) )
+
+ e3t1=e3t[0, 0, :, :]
+ e3w1=e3w[0, :, :, :]
+ rhop=rhopv[l, :, :, :]
+ ssh=ssh1[l, :, :]
+
+ for k in range(0,jk):
+ if k==0:
+ p0=0.5*grav*e3t1*rhop[k,:,:]+(rhop[k,:,:]*grav*ssh[:,:])
+ else:
+ p0+=0.5*grav*e3w1[k,:,:]*(rhop[k,:,:]+rhop[k-1,:,:])
+
+ p0*=tmask[k,:,:]
+ p_tot[k,:,:]=p0
+
+ p_tot[tmask==0]=nc.default_fillvals['f4']
+ pv[l,:,:,:] = p_tot
+ otv[l] = time
+
+#===============================================================================
+# clean-up
+#===============================================================================
+
+ lefichier.close()
+ ncfile.close()
+
+
+#*******************************************************************************
+if __name__ == '__main__':
+ #file:///usr/share/doc/packages/python/html/python-2.7-docs-html/library/sys.html#sys.exit
+ sys.exit(main(sys.argv))
diff --git a/example/diff_eulerien-lagrangien.py b/example/diff_eulerien-lagrangien.py
new file mode 100644
index 0000000000000000000000000000000000000000..febcc5002b231d45873f4cbc812251cb8d94be61
--- /dev/null
+++ b/example/diff_eulerien-lagrangien.py
@@ -0,0 +1,113 @@
+#!/usr/bin/python
+
+import sys
+import numpy as np
+import netCDF4 as nc
+from numpy import arange, dtype
+import math
+
+#*******************************************************************************
+def main(args):
+
+ """USE
+ {0} mask.nc input.nc output.nc
+
+DESCRIPTION
+ Computes pressure from density and e3t (that changes with SSH).
+
+"""
+ if len(args)<4 or args[1]=='-h' or args[1]=='--help':
+ print( main.func_doc.format(args[0]) )
+ return 0
+
+
+
+#===============================================================================
+# input
+#===============================================================================
+
+ file_pressure_eulerien = args[1]
+ fichierpression1 = nc.Dataset(file_pressure_eulerien)
+
+ ptot_a=fichierpression1.variables['Ptot_a'][:,:,:]
+ ptot_G=fichierpression1.variables['Ptot_G'][:,:,:]
+ depth=fichierpression1.variables['dept'][:]
+ lon=fichierpression1.variables['lont'][:]
+ lat=fichierpression1.variables['latt'][:]
+
+ jj=ptot_a.shape[1]
+ ii=ptot_a.shape[2]
+ kk=ptot_a.shape[0]
+
+
+ file_pressure_lagpatch = args[2]
+ fichierpression2 = nc.Dataset(file_pressure_lagpatch)
+ P_corr_A=fichierpression2.variables['P_corr_A'][:,:,:]
+ P_corr_G=fichierpression2.variables['P_corr_G'][:,:,:]
+
+
+
+#===============================================================================
+# output
+#===============================================================================
+
+ p_file=args[3]
+ print('Creating '+p_file)
+
+ # this will overwrite the file
+ ncfile = nc.Dataset(p_file,'w', format='NETCDF3_CLASSIC')
+ setattr(ncfile,'history',' '.join(args))
+ ncfile.createDimension('x',ii)
+ ncfile.createDimension('y',jj)
+ ncfile.createDimension('dept',kk)
+
+
+ data = ncfile.createVariable('lont',dtype('float64').char,('y','x'))
+ data[:] = lon
+ setattr(data, 'units',"degrees_north")
+ setattr(data, 'standard_name',"longitude_at_T_location")
+
+ data = ncfile.createVariable('latt',dtype('float64').char,('y','x'))
+ data[:] = lat
+ setattr(data, 'units',"degrees_east")
+ setattr(data, 'standard_name',"latitude_at_T_location")
+
+ data = ncfile.createVariable('dept',dtype('float64').char,('dept'))
+ data[:] = depth
+ setattr(data, 'units',"m")
+ setattr(data, 'positive',"down")
+ setattr(data, 'standard_name',"depth_at_T_location")
+ setattr(data, 'axis',"Z")
+
+ p_diff_a = ncfile.createVariable('P_corr_A',dtype('float32').char,('dept','y','x'))
+ setattr(p_diff_a, 'standard_name',"Amplitude Of Pressure Total")
+ setattr(p_diff_a, 'units',"m-1.kg.s-2")
+ setattr(p_diff_a, 'coordinates', "dept latt lont")
+
+ p_diff_G = ncfile.createVariable('P_corr_G',dtype('float32').char,('dept','y','x'))
+ setattr(p_diff_G, 'standard_name',"Phase Of Pressure Total")
+ setattr(p_diff_G, 'units',"m-1.kg.s-2")
+ setattr(p_diff_G, 'coordinates', "dept latt lont")
+
+#===============================================================================
+# process
+#===============================================================================
+
+ p_diff_a[:,:,:] = ptot_a[:,:,:] - P_corr_A[:,:,:]
+ p_diff_G[:,:,:] = ptot_G[:,:,:] - P_corr_G[:,:,:]
+
+
+#===============================================================================
+# clean-up
+#===============================================================================
+
+ fichierpression1.close()
+ fichierpression2.close()
+ ncfile.close()
+
+
+#*******************************************************************************
+if __name__ == '__main__':
+ #file:///usr/share/doc/packages/python/html/python-2.7-docs-html/library/sys.html#sys.exit
+ sys.exit(main(sys.argv))
+