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Ploting an array[][] on Jyhton

Hello everybody:

I'm having some problems on plotting a 512*512 array of float. I get the
message:

TypeError:field(): 1st arg can't be coercd to float[] or
float[][]

But on the Jyhton tutorial there is an exemple doing the same thing with
no problem.

Here is my code:

--------------------------------------------------
import struct
import math
from struct import *
from visad.python.JPythonMethods import *

matriz = []
file=open("radar200108291645Z.dat",'rb')
for i in range(512):
        linha = []
        g=file.read(2048)
        linha.append(struct.unpack('512f',g)) 
        matriz.append(linha)
f=field(matriz)
plot(f)

-------------------------------------------
And the code in the tutorial

-------------------------------------------
from visad.python.JPythonMethods import *
import math

z = []
for i in range(0,32):
  a = []
  for j in range(0,32):
    a.append( math.sin(i*j*.0174533))
  z.append(a)

f = field(z)
plot(f)

Thaks 

CICERO
cicero@xxxxxxxxxx


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