python - numpy loadtxt IndexError: list index out of range -


i'm newbie python , have text file looks this:

# wed 13:10:08 11-mar-2015  begin  aperture image1 1 1024. 139.7445  image  image1  aperture   1  beam   1  center 1024. 139.7445  low        -1023. -4.  high   1024. 4.  background          xmin -40.45428          xmax 43.75221          function chebyshev          order 3          sample -40.45428:-18.42313 20.09063:43.75221          naverage 1          niterate 0          low_reject 3.          high_reject 3.          grow 0.  axis    2  curve   6          2.          2.          4.          2044.          -0.1275881          -0.03320996

i want extract '139.7445' sixth row ('center'). code:

pos_wasp = np.loadtxt(line, skiprows=5, usecols=(3,4), unpack=true)

but when run it, gives error:

indexerror: list index out of range

it should simple problem solve , i've been trying change column numbers , data types many times, still doesn't work.

i think code failing because loadtxt wants read in lines after 1 value on. 1 value, why not read file (inpp.txt, or whatever yours called) directly:

with open('inpp.txt') fi:     line in fi:         fields = line.split()         if fields[0] == 'center':             val = float(fields[2])             break  print(val)

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