Scientific Computing with Python 3

NumPy methods

NumPy has built-in methods for reading and writing NumPy array data to text files. These are numpy.loadtxt and numpy.savetxt.

savetxt

Writing an array to a text file is simple:

savetxt(filename,data)

There are two useful parameters given as strings, fmt and delimiter, which control the format and the delimiter between columns. The defaults are space for the delimiter and %.18e for the format, which corresponds to the exponential format with all digits. The formatting parameters are used as follows:

x = range(100) # 100 integers
savetxt('test.txt',x,delimiter=',')   # use comma instead of space
savetxt('test.txt',x,fmt='%d') # integer format instead of float with e

 loadtxt

Reading to an array from a text file is done with the help of the ...