entry.py

"""
Authors: Ben Huenemann and Michael Keyser
Date: 10/17/20
This script serves as the entry to our project. It asks the user to enter in the
number of elements of the sequence along with the option to generate a random
sequence. It also takes command line arguments to determine the output. If the
command line argument is p the longest sequence will be printed. If g is passed
as an argument then a graph with the sequence and its longest subsequence will be
generated. If p g is passed the longest subsequence will be printed along with
the graph being generated.
"""

import functions as f
import convergence as c
import sys

# number of elements to be in sequence
num_elements = input("How many elements do you want in your sequence: ")
# the sequence as a string, eg. 1/n
sequence = input("Enter the sequence with n as the variable, or type RANDOM to generate a random sequence: ")
# what limit we want to converg to
limit = input("Enter the limit you want to converge to: ")

try:
    limit = float(limit)
    seq = []
    longest_seq = []
    indices = []
    if sequence == "RANDOM": # the user provided RANDOM as the sequence
        lower = input("Provide lower bound: ") # ask for a lower bound
        lower = float(lower.strip())
        upper = input("Provide upper bound: ") # ask for an upper bound
        upper = float(upper.strip())
        seq = f.generate_random_sequence(lower, upper, int(num_elements)) # generate a random sequence given the upper and lower bound
        indices, longest_seq = c.longest_subsequence(seq, limit) # find the longest subsequence
    else: # user provided a sequence, e.g. 1/n
        seq = f.generate_specific_sequence(sequence, int(num_elements)) # generate the sequence using the sequence definition provided by user
        indices, longest_seq = c.longest_subsequence(seq, limit) # find the longest subsequence

    num_args = len(sys.argv)
    if(num_args > 1): # user provided a command line argument
        if str(sys.argv[1]) == "p": # check if first command line argument was p
            print("Longest Sequence: ", longest_seq)
        elif str(sys.argv[1]) == "g":
            f.graph(indices, longest_seq, seq)
    if(num_args == 3): # user provided 2 command line arguments
        if(str(sys.argv[2]) == "g"): # check if second command line argument was g
            f.graph(indices, longest_seq, seq)
except RecursionError as err:
    print("A RecursionError ocurred when finding the longest sequence. Please choose a less intensive sequence as described in the README.")
except:
    print("An error ocurred. Check your input format.\nCheck all command line arguments and inputs adhere to specifications in the README.")