With this coding find the Max Roughness, Root-Mean-Square, and Arithmetic Mean using the values from the Surface.txt: -4.1 -2.2 -0.5 1.2 3.3 4.6 5.1 2.1 0.2 -3.6 -4.1 0.2 0.5 2.2 4.1 -0.2 -1.2 -3.3 -4.6 -5.0 -2.2 -1.1 0.8 3.2 -0.1 -4.8 Coding:  import numpy as np import math as mt #declare variables roughness=np.zeros(50,dtype=float) #50 dimension array min=0.0 max=0.0 sum=0.0 sqSum=0.0 Ra=0.0 Rq=0.0 maxRoughness=0.0 i=0 #check if input file exists or not try : #open Surface.txt file in 'read' mode inFile=open("Surface.txt","r") except FileNotFoundError: print("\n\t Error in opening the file... \n\n") else: #read the first value from file roughness[i]=float(inFile.readline()) #initialise min and max values min=max=roughness[i] #initialise sum sum+=roughness[i] #initialise sqSum sqSum+=roughness[i]*roughness[i] #loop till end of file while i<49 : i+=1 #read value from file; one at a time roughness[i]=float(inFile.readline()) #check value is less than min or not if roughness[i]max : max=roughness[i] #calculate cumulative sum sum+=roughness[i] #calculate cumulative sum square if the value sqSum+=roughness[i]*roughness[i] #close inFile inFile.close() #increment i as it started from 0 i+=1 #calculate value of Ra Ra = abs(sum)/i #calculate value of Rq Rq = mt.sqrt(sqSum/i) #calculate value of Maximum roughness maxRoughness = max-min #open Indicators.txt file in append mode outFile=open("Indicators.txt","a") #write message to output file outFile.write("Input data (measures of the roughness of the surface of an object): \n\n") #for formatting outFile.write("\t") #loop to write 6 values per line for x in range(i) : outFile.write(str(roughness[x])+" ") #insert new line after 6 values if (x+1)%6==0 : outFile.write("\n\t")   #for formatting outFile.write("\n\n\n") #write the 3 surface roughness indicators to file outFile.write("Arithmetic mean value (Ra) :"+str(Ra)+"\n") outFile.write("Root-mean square average (Rq) :"+str(Rq)+"\n") outFile.write("Maximum roughness height :"+str(maxRoughness)+"\n") outFile.close() #print message print("Calculations completed and the results are stored in Indicators.txt \n")

With this coding find the Max Roughness, Root-Mean-Square, and Arithmetic Mean using the values from the Surface.txt:

-4.1 -2.2 -0.5 1.2 3.3 4.6 5.1 2.1 0.2 -3.6 -4.1 0.2 0.5 2.2 4.1 -0.2 -1.2 -3.3 -4.6 -5.0 -2.2 -1.1 0.8 3.2 -0.1 -4.8

Coding: