from sa_data_functions import *

while 1 :
    f = raw_input('Enter file name:  ')
    try:
        fo = open(f, 'r')
        fo.close()
    except :
        print("File does not exist.")

    scales = [1.0e-06, 1.0]     # This will change the horizontal scale to MHz.
    [h, v], error = ReadDataFromFile(f, scales)
    if len(error) :
        print error
        sys.exit()
    v = RCFilterFFT(v, len(v)/20)   # 20 the a minimum characteristic parameter recommended.
    plot(h, v)
    show()