Added 'sample_app.py' code

sample_app.py

@@ -1,15 +1,23 @@
-# This function was automatically generated. When modifying its signature, take care to apply
+import numpy as np
-# modifications also to the descriptor files in the repository.
+import matplotlib.pyplot as plt
 
 def main(numbers_files, multiplier):
     """
-    Main function for application: PYTHONSAMPLEAPPMULTIPLEFILES
+    Example Python application that reads the given numbers_files and multiplies
+    the content (numbers) by the supplied multiplier
     Arguments:
-        numbers_files: path to input file of type 'text_data'
+        numbers_files: list of paths to input files of type 'text_data'
-        multiplier: parameter of type 'INTEGER'
+        multiplier: number by which the arrays of numbers are multiplied
     Returns:
-        File(s) named 'multiplied_numbers_plot.png' of type 'image_data' and format 'PNG' from working directory
+        A file named 'multiplied_numbers_plot.png' containing a plot of multiplied 
+        numbers.
     """
 
-    # TODO: Put your application code here
+    plt.figure()
-
+    for numbers_file in numbers_files:
+        numbers = np.genfromtxt(numbers_file, comments="#", delimiter=",", unpack=False)
+        numbers = numbers[~np.isnan(numbers)]
+        numbers = np.array(numbers).flatten()
+        multiplied_numbers = numbers * multiplier
+        plt.plot(multiplied_numbers)
+    plt.savefig('multiplied_numbers_plot.png')