Setting a reference number and comparing that to other data in textfile

Question

The project is based on Eye Tracker. Let me brief the idea behind the project to understand my problem better.

I have the hardware of Tobii C eye tracker. This eye tracker will be able to give out coordinates of the X, Y of where I am looking at. But this device is very sensitive. When I look at 1 point, the eye tracker will send out many different data of coordinates but within ± 100 range which I found out. Even though you are staring at 1 point, your eyes keep moving, therefore giving out many data. This many data (float numbers) are then saved in a text file. Now I only need 1 data (X coordinate) which signifies the 1 point I am staring instead of the many data which are within the ± 100 range and move it to a new text file.

I have no idea how I should code to do that.

These are the float numbers in the text file.

When I stare at point 1, the data are 200-300, which are within the ± 100 range. I wanna set the 200 as reference point subtracts itself with the next number and check if the resultant value within 100, if it is, remove them. The reference point should keep doing that to the following numbers until it reaches outside the ± 100 range. Once outside the 100 range, now the number is 310, then now this number is the next reference point and do the same and subtract with the following numbers below and check if the resultant value within 100. Once outside the 100 range, the next number is 500, now, that is the new reference point, and do the same. That is my objective. To put it to simpler terms, The reference points should be moved into a new file.

This is my code so far which get the gaze coordinates and stores them in a text file.

 using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text;
 using Tobii.Interaction;

namespace ConsoleApp1
{

class Program
{

    private static void programintro()
    {
        Console.WriteLine("Press Any Keys To Start");
    }
    public static void Main(string[] args)
    {

        programintro();
        Console.ReadKey();
        double currentX = 0.0;
        double currentY = 0.0;
        double timeStampCurrent = 0.0;
        double diffX = 0.0;
        double diffY = 0.0;
        int counter = 0;
        var host = new Host();
        host.EnableConnection();
        var gazePointDataStream = host.Streams.CreateGazePointDataStream();
        gazePointDataStream.GazePoint((gazePointX, gazePointY, timestamp) =>

        {
            diffX = gazePointX - currentX;
            diffY = gazePointY - currentY;
            currentX = gazePointX;
            currentY = gazePointY;
            timeStampCurrent = timestamp;
            if (diffX > 100 || diffX <= -100 || diffY >= 100 || diffY <= -100)
            {
                counter++;
                using (StreamWriter writer = new StreamWriter("C: \\Users\\Student\\Desktop\\FYP 2019\\ConsoleApp1\\ConsoleApp1\\Data\\TextFile1.txt", true))
                {
                    writer.WriteLine("Recorded Data " + counter + "\n=================================================================================================================\nX: {0} Y:{1}\nData collected at {2}", currentX, currentY, timeStampCurrent);
                    writer.WriteLine("=================================================================================================================");
                }
                Console.WriteLine("Recorded Data " + counter + "\n=================================================================================================================\nX: {0} Y:{1}\nData collected at {2}", currentX, currentY, timeStampCurrent);
                Console.WriteLine("=================================================================================================================");
            }
        });
        //host.DisableConnection();
        while (true)
        {
            if (counter <  10)
            {
                continue;
            }
            else
            {

                Environment.Exit(0);

            }
        }

Now my Question is how do I code to read the text file and set a reference number and subtracts itself with the next number and check if the resultant value within 100 and have a new reference number if it outside the ± 100 range. Those reference numbers are then stored in a new text file.

Pull up, pull up! Before you start processing this data, you need to understand the physiological process behind it. Plot the time series of the x and y components. Does it look like a proper saccade and fixate sequence? Are there transient blink artefacts, or periods of smooth pursuit? Is the head fixed, or is the VOR operating? Visualise before processing. If you aren't dealing with artefacts, or understanding the rapid transients (saccadic/vestibular/blink), your prematurely processed data will be meaningless. Start here perhaps: https://link.springer.com/article/10.3758/s13428-016-0738-9 — Michael MacAskill, Jun 18 '19 at 06:51
Damnn, i pulled up to a stop. However yr words are alien to me — Kiwi, Jun 18 '19 at 06:54
And therein lies the problem. Analysing eye tracking data requires some domain-specific knowledge before you start doing any signal processing (probably like any other biological signal). — Michael MacAskill, Jun 18 '19 at 06:57

Nirav Mistry · Accepted Answer · 2019-06-19T05:17:26.930

1

Based on your sample data here is the code to get only numbers which has 100+ difference.

static void Main(string[] args)
{
  string filename = @"C:\PowershellScripts\test.txt"; // INPUT FILE
  String outputFile = @"C:\PowershellScripts\result.txt"; // OUTPUT FILE

  string[] data = File.ReadAllLines(filename); // READING FORM FILE
  int TotalLine = data.Length; // COUNT TOTAL NO OF ROWS
  List<string> FinalList = new List<string>(); // INITIALIZE LIST FOR FINAL RESULT

  if (TotalLine <= 0) // CHECK IF FILE HAS NO DATA
  {
      Console.WriteLine("No Data found !");
      return;
  }

  double CurrentNumber = double.Parse(data[0]), NextNumber = 0, diff = 0; // INITIALIZE OF LOCAL VARIABLES, CURRENT NUMBER = FIRST NO FROM FILE

  for (int cntr = 1; cntr < TotalLine; cntr++) // FOR LOOP FOR EACH LINE
  {
      NextNumber = double.Parse(data[cntr]); //PARSING NEXT NO
      diff = CurrentNumber - NextNumber; // GETTING DIFFERENCE

      if (diff <= 100 && diff >= -100) // MATCH THE DIFFERENCE
      {
          continue; // SKIP THE LOGIC IF DIFF IS LESS THEN 100
      }
      else
      {
          FinalList.Add(CurrentNumber.ToString()); // ADDING THE NO TO LIST
          CurrentNumber = NextNumber; // POINTING TO NEXT NO
      }

  }

  FinalList.Add(CurrentNumber.ToString()); // ADDING LAST NO.
  foreach (string d in FinalList) // FOR EACH LOOP TO PRINT THE FINAL LIST
      Console.WriteLine(d);

  File.WriteAllLines(outputFile, FinalList); // SAVING TO THE FILE

}

The above program will generate the output is :

200
310
500

edited Jun 19 '19 at 05:17

answered Jun 17 '19 at 06:38

Nirav Mistry

949
5
15

Hi thanks for yr help, however it did not show any output when compiled – Kiwi Jun 17 '19 at 07:00
i did change my file path according to mine. but wdym by replace whole sample code with my main function. I did not add yr code together with mine. i wanna test it out separately. so i created a new program and add yr codes. – Kiwi Jun 17 '19 at 07:05
are you developing in Visual studio console application ? – Nirav Mistry Jun 17 '19 at 07:10
Yes. I am doing in Visual studio console application – Kiwi Jun 17 '19 at 07:15
are you pressing ctrl+F5 ? – Nirav Mistry Jun 17 '19 at 07:16
i press start, which is compile. – Kiwi Jun 17 '19 at 07:23
The program '[16152] ReadTextFile.exe' has exited with code 0 (0x0). There wasnt any error, but this was said – Kiwi Jun 17 '19 at 07:24
I have edited my answer, check the screen shot of the outout. or you can run .exe file from bin/debug folder. – Nirav Mistry Jun 17 '19 at 07:31
I want to add this output to a new text file. I am able to do in yr code? – Kiwi Jun 17 '19 at 09:16
Please do reply once seen – Kiwi Jun 18 '19 at 02:06
Thanks sir, is it possible if you could explain the the code line by line, like the meaning for using it – Kiwi Jun 18 '19 at 08:28
Please do reply once seen – Kiwi Jun 19 '19 at 03:39
Okay, will do that – Nirav Mistry Jun 19 '19 at 03:58
Much appreciated – Kiwi Jun 19 '19 at 04:49
I have added the comments – Nirav Mistry Jun 19 '19 at 05:18
Aights, thank you, i will try to understand the codes and get back to you later – Kiwi Jun 19 '19 at 07:56
for (int cntr = 1; cntr < TotalLine; cntr++) and the purpose of this line, i dont quite understand – Kiwi Jun 26 '19 at 03:00
for (xxx) is iteration of all the lines from input file.. and diff is variable which holds a difference value.. NextNumber is variable to store next number until we change/add number to the list – Nirav Mistry Jun 26 '19 at 03:51
what does the cntr stands for, like its purpose – Kiwi Jun 26 '19 at 03:53
its a loop variable...like repeat the loop from 1 to N times with increament of the cntr value.. – Nirav Mistry Jun 26 '19 at 03:55
aight, May i know why Next number is equal to 0 and the diff is 0 – Kiwi Jun 26 '19 at 03:59
its initial default value assigned to the variable,, you can remove = 0. Its a optional.. – Nirav Mistry Jun 26 '19 at 04:00
(int cntr = 1; cntr < TotalLine; how about this, why cntr equals to 1 and it is less than total number of rows – Kiwi Jun 26 '19 at 04:31
your reply will be much appreciated – Kiwi Jun 26 '19 at 09:01
bcoz we are reading first and last lines are setting separately . – Nirav Mistry Jun 26 '19 at 09:21
alright, thanks for guiding me throughout the whole code – Kiwi Jun 27 '19 at 04:22
appreciate your speedy replies. However i have more qn with the same concept which i will post seperately in another qn. Hope u will hang around mate – Kiwi Jun 27 '19 at 04:27
Hey buddy, it will be very helpful if u could see my new qn s i have used yr code as example to understand my new qn – Kiwi Jul 03 '19 at 06:21

Setting a reference number and comparing that to other data in textfile

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