Question

I have a data file with only one line like:

 1.2  2.1  3.2

I used numpy version 1.3.0 loadtxt to load it

 a,b,c = loadtxt("data.dat", usecols(0,1,2), unpack=True)

The output was a float instead of array like

 a = 1.2

I expect it would be:

 a = array([1.2])

If i read a file with multiple lines, it’s working.

Answer 1

The simple way without using reshape is, to explicitly typecast the list

 a,b,c = loadtxt("data.dat", usecols(0,1,2), unpack=True)
 a,b,c = (a,b,c) if usi.shape else ([a], [b], [c])

This works faster than the reshape!