yr = N.arange(10.)
xxr, yyr = N.meshgrid(xr, yr)
zzr = (N.sin(xxr*N.pi/6)*N.sin(yyr*N.pi/6) + \
N.exp(-((xxr-7.)**2+(yyr-7.)**2)/4.**2))*100.
zzr -= zzr.min()
vminmax = dict(vmin=zzr.min(), vmax=zzr.max())
ij = N.unique((N.random.rand(50) * zzr.size).astype('i'))
xi, yi, zi = xxr.flat[ij], yyr.flat[ij], zzr.flat[ij]
ij2 = N.unique((N.random.rand(50) * zzr.size).astype('i'))
xo2, yo2 = xxr.flat[ij2], yyr.flat[ij2]
# CDAT natgrid
from nat import Natgrid
I = Natgrid(xi, yi, xr, yr)
I.ext = 1
I.igr = 1
zzoc = I.rgrd(zi).T
# Matplotlib / R. Kern
from matplotlib.delaunay import Triangulation
tri = Triangulation(xi, yi)
I = tri.nn_extrapolator(zi)
zzok = I(xxr, yyr)
# Plot
from matplotlib import pyplot as P
P.figure(figsize=(4, 11))
yr = N.arange(10.)
xxr, yyr = N.meshgrid(xr, yr)
zzr = (N.sin(xxr*N.pi/6)*N.sin(yyr*N.pi/6) + \
N.exp(-((xxr-7.)**2+(yyr-7.)**2)/4.**2))*100.
zzr -= zzr.min()
vminmax = dict(vmin=zzr.min(), vmax=zzr.max())
ij = N.unique((N.random.rand(50)*zzr.size).astype('i'))
xi, yi, zi = xxr.flat[ij], yyr.flat[ij], zzr.flat[ij]
ij2 = N.unique((N.random.rand(50)*zzr.size).astype('i'))
xo2, yo2 = xxr.flat[ij2], yyr.flat[ij2]
# CDAT natgrid
from nat import Natgrid
I = Natgrid(xi, yi, xr, yr)
I.ext = 1
I.igr = 1
zzoc = I.rgrd(zi).T
# Matplotlib / R. Kern
from matplotlib.delaunay import Triangulation
tri = Triangulation(xi,yi)
I = tri.nn_extrapolator(zi)
zzok = I(xxr,yyr)
# Plot
from matplotlib import pyplot as P
P.figure(figsize=(4, 11))
P.subplot(311)
N.exp(-((xxr-7.)**2+(yyr-7.)**2)/4.**2))*100.
zzr -= zzr.min()
vminmax = dict(vmin=zzr.min(), vmax=zzr.max())
# - un jeu alatoire (input)
ij = N.unique((N.random.rand(50)*zzr.size).astype('i'))
xi, yi, zi = xxr.flat[ij], yyr.flat[ij], zzr.flat[ij]
# - un autre jeu aleatoire (output)
ij2 = N.unique((N.random.rand(100)*zzr.size).astype('i'))
xo, yo = xxr.flat[ij2], yyr.flat[ij2]
# Sans VACUMM
# - CDAT natgrid
from nat import Natgrid
I = Natgrid(xi, yi, xr, yr)
I.ext = 1 # Changer
I.igr = 1 # les parametres
zzoc = I.rgrd(zi).T
# - Matplotlib / R. Kern
from matplotlib.delaunay import Triangulation
tri = Triangulation(xi,yi)
I = tri.nn_extrapolator(zi) # Tester les autres methodes
zzork = I(xxr,yyr) # vers grille
zork = I(xo,yo) # vers points
# Avec VACUMM
from vacumm.misc.grid.regridding import GridData, griddata, xy2xy
zzov = griddata(xi, yi, zi, (xr, yr), method='nat', ext=True, sub=10)