Python, how to slice a netcdf file.
Question: I am trying to slice a variable from a netcdf file and plot it but I am
running into problems.

This is from my code:

    
    
    import numpy as np
    from netCDF4 import Dataset
    Raw=  "filename.nc"
    data = Dataset(Raw)
    u=data.variables['u'][:,:,:,:]
    print u.shape 
    U=u([0,0,[200:500],[1:300]]) 
    

#The print statement yields (2, 17, 900, 2600) as u's dimensions.

#U Is the slice of the dataset I am interested inn. A small subset of the
4-dimensional vector. This last line of code gives me a syntax error and I
cannot figure out why.

Trying to pick out a single value from the array ( u(0,0,0,1)) gives me an
Type error: TypeError: 'MaskedArray' The program's aim is to perform simple
algebra on a subset of this subset and to plot this data. Any help is
appreciated.


Answer: I think the comment by Spencer Hill is correct. Without seeing the full error
message, I can't be sure, but I'm pretty sure that the `TypeError` results
from you (through the use of parenthesis) trying to call the array as a
function. Try:

` U=u[0,0,200:500,1:300] `

