[SciPy-User] Interpolation in 3D with interp2d

Jana Schulz schrabacke@web...
Sun Aug 1 14:25:37 CDT 2010


Hi,

I'm trying to interpolate a 3D data (from the pic attached) with the
interp2d command. What I have, are three vectors f, z, A (x, y, z
respectively, A is the percentage data given on the isolines). I first put
the f and z in a meshgrid and afterwards pruduced a mesh with the A vector
then started to interpolate. I plotted the the data after gridding, and I
observed that almost all nodes are ignored.
Do you have any idea how to prepare data to the interp2d command?

my code so far is:

import numpy as np
from matplotlib import rc
from mpl_toolkits.mplot3d import axes3d
from scipy.interpolate import interp2d
from scipy import interpolate, mgrid
import matplotlib.pyplot as plt
from matplotlib import mlab
import griddata
plt.close()


plt.clf()
fig = plt.figure(1)
ax = axes3d.Axes3D(fig)

#read data
(ff,ZZ,A,a) = np.loadtxt("accuracy-map_pointsonly.txt", unpack=True)
f=np.log10(ff)
z=np.log10(ZZ)

##grid everything
fgrid, zgrid=np.meshgrid(f,z)
#define grid
n=1e2 #number of nodes (linear)
ef=np.linspace(min(f), max(f), n)
ez=np.linspace(min(z), max(z), n)
efmesh, ezmesh=np.meshgrid(ef,ez)

efg, ezg=np.meshgrid(f, z)
Ag,Ag=np.meshgrid(A,A)

int2d=interp2d(fgrid, zgrid, Ag, kind='linear')
intnew=int2d(ef, ez)                                      #return the new function

ax.plot(f,z,A,'ok', markerfacecolor='w')
ax.plot_surface(efmesh,ezmesh, intnew)
ax.view_init(elev=220, azim=270)
ax.set_xlim3d((min(f), max(f)))
ax.set_ylim3d(min(z), max(z))
ax.set_zlim3d(0,100)
plt.show()
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