[Numpy-discussion] Read array from file
lorenzo bolla
lbolla@gmail....
Fri Mar 14 05:21:32 CDT 2008
what about numpy.loadtxt?
In [9]: numpy.loadtxt('test.dat', skiprows=5)
Out[9]:
array([[ 15.44261, 12.05814, 54.43124],
[ 15.54899, 12.00075, 53.85503],
[ 15.95802, 11.92959, 53.88939],
[ 15.84085, 12.00235, 54.43274],
[ 15.53889, 11.16645, 54.51649],
[ 15.57673, 11.10806, 53.96009],
[ 16.10059, 11.06809, 53.87672],
[ 16.04238, 11.11615, 54.47454],
[ 15.78142, 11.82206, 53.33932],
[ 16.13055, 11.75515, 53.3731 ]])
hth,
L.
On Fri, Mar 14, 2008 at 11:12 AM, Dimitrios Kiousis <dkiousis@gmail.com>
wrote:
> Hello python users,
>
> I have an input file consisting of string-lines and float-lines. This is
> how it looks:
>
> # vtk DataFile Version 3.0
> VTK file exported from FEAP
> ASCII
> DATASET UNSTRUCTURED_GRID
> POINTS 6935 FLOAT
> 15.44261 12.05814 54.43124
> 15.54899 12.00075 53.85503
> 15.95802 11.92959 53.88939
> 15.84085 12.00235 54.43274
> 15.53889 11.16645 54.51649
> 15.57673 11.10806 53.96009
> 16.10059 11.06809 53.87672
> 16.04238 11.11615 54.47454
> 15.78142 11.82206 53.33932
> 16.13055 11.75515 53.37313
> .................
>
> I want to read the first 5 string lines, and then store the float data
> (coordinates) into an array.
> It took me some time to figure this out but this is the script with which
> I came out:
>
> # Read and write the first information lines
> for i in range(0,5):
> Fdif.write( Fpst.readline() )
>
> # Read and write coordinates
> # --------------------------
>
> # Initialization
> coords = zeros( (nnod,3), float )
>
> for i in range(0,nnod):
> # Read line
> x = Fref.readline() # Read lines
> x = x.split() # Split line to strings
> x = map ( float,x ) # Convert string elements to floats
> x = array ( x ) # Make an array
> for j in range (0,3):
> coords[i,j] = x[j]
>
> It seems quite complicated to me, but I haven't figure any nicer way.
> Could you tell me if what I am doing looks reasonanble or if there are any
> other solutions?
> Do I really need to initiallize coords?
>
> Thanks in advance,
> Dimitrios
>
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>
--
Lorenzo Bolla
lbolla@gmail.com
http://lorenzobolla.emurse.com/
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