public static string Grade(String MatrixMapJSON, String AnswerJSON, String question, String assignment)
{
//initialize floats for total point value and their grade so far on assignment
float questionValue = 0;
float currentGrade = 0;
//Get session variables
float[,] sessionMatrix = (float[, ])HttpContext.Current.Session["matrix"];
float[] sessionActualAnswer = (float[])HttpContext.Current.Session["actualAnswer"];
//int sessionMinNumOfRowsOps = (int)HttpContext.Current.Session["minNumOfRowOps"];
Boolean sessionInconsistent = (Boolean)HttpContext.Current.Session["inconsistent"];
int sessionNumOfFreeVars = (int)HttpContext.Current.Session["numOfFreeVars"];
String assignId = (String)HttpContext.Current.Session["assignment"];
string feedback = "";
//first we need to check if the homework assignment is in the database
AssignComponent.Assigner check = new AssignComponent.Assigner();
int theresanassignment = check.checkAssignmentExists(assignId);
if (theresanassignment == 1)
{
//query to fetch question's point value and their current grade on the assignment
string connStr = ConfigurationManager.ConnectionStrings["linearhmwkdb"].ConnectionString;
MySqlConnection msqcon = new MySqlConnection(connStr);
try
{
msqcon.Open();
String query = "SELECT q.pointValue, ha.grade FROM question AS q JOIN hmwkassignment AS ha WHERE ha.homeworkId=q.homeworkId AND ha.assignmentId = " + assignment + " AND q.number = " + question;
MySqlCommand msqcmd = new MySqlCommand(query, msqcon);
MySqlDataReader points = msqcmd.ExecuteReader();
points.Read();
questionValue = points.GetFloat(0);
currentGrade = points.GetFloat(1);
points.Close();
}
catch (Exception)
{
throw;
}
Dictionary <int, float[, ]> MatrixMap = JsonConvert.DeserializeObject <Dictionary <int, float[, ]> >(MatrixMapJSON);
MatrixBuilder.MatrixOperations mb = new MatrixBuilder.MatrixOperations();
//get the amount to deduct by dividing the total points by our approximate number of steps to solve (+1 for first matrix) (+1 for copying the answer correctly)
//shifted then rounded to keep it to 2 decimal points, then shifted back
float deductValue = (float)Math.Round((questionValue / ((float)mb.countOperationsNeeded(sessionMatrix) + 2F)) * 100F) / 100F;
//if above gives a value of 0 (a rediculously large number of steps), correct to .01 so points are actually deducted
if (deductValue == 0)
{
deductValue = .01F;
}
//should probably check if the first matrix is the actual first matrix
float[,] augMatrix = null;
MatrixMap.TryGetValue(0, out augMatrix);
//Not sure if this if works
if (!mb.checkMatrixEquality(sessionMatrix, augMatrix))
{
feedback += "<div>The first matrix does not match the given matrix.<div>";
}
if (AnswerJSON.Contains("I"))
{
feedback += mb.checkSingleRowOperation(MatrixMap);
if (!sessionInconsistent)
{
feedback += "<div>The matrix is actually consistent.<div>";
}
}
else if (AnswerJSON.Contains("F"))
{
feedback += mb.checkSingleRowOperation(MatrixMap);
if (sessionNumOfFreeVars > 0)
{
Dictionary <int, String> AnswersConverted = JsonConvert.DeserializeObject <Dictionary <int, String> >(AnswerJSON);
String[] Answers = new String[AnswersConverted.Count()];
AnswersConverted.Values.CopyTo(Answers, 0);
feedback += mb.checkFreeVariableAnswers(sessionMatrix, Answers);
}
else
{
feedback += "<div>The solution actually contains no free variables.<div>";
}
}
else
{
//Dictionary<int, float> AnswersConverted = JsonConvert.DeserializeObject<Dictionary<int, float>>(AnswerJSON);
//float[] Answers = new float[AnswersConverted.Count()];
//AnswersConverted.Values.CopyTo(Answers, 0);
float[,] studentident = null;
feedback += mb.checkSingleRowOperation(MatrixMap);
MatrixMap.TryGetValue(MatrixMap.Count() - 1, out studentident);
//Will need to also check answers here
feedback += mb.checkForIdentity(studentident, sessionMatrix);
}
float grade = questionValue;
//ensure there was feedback, if not, will retain value of the question's total points
if (!feedback.Equals(""))
{
//Run through feedback, create array of statements based on . to count number of point deductions
String[] deductionStrings = feedback.Split('.');
//set grade to the total minus the deduct amount times number of mistakes
grade = questionValue - deductValue * (deductionStrings.Length - 1);
//correct any odd values from results close to 0 by re-rounding to 2 decimal points
grade = (float)Math.Round(grade * 100F) / 100F;
}
//make their grade go no lower than 0 (no negative points)
if (grade < 0)
{
grade = 0;
}
//create grade to write back to database
float updatedGrade = grade + currentGrade;
//Need to display points somehow
if (grade == 1)
{
feedback += "<!-- -->";
}
feedback += "<div><strong>Points Earned: </strong>" + grade + " / " + questionValue + "<div>";
//Update grade in database
msqcon = new MySqlConnection(connStr);
try
{
msqcon.Open();
String query = "UPDATE hmwkassignment AS ha SET ha.grade = " + updatedGrade + " WHERE assignmentId = " + assignment;
MySqlCommand msqcmd = new MySqlCommand(query, msqcon);
msqcmd.ExecuteNonQuery();
}
catch (Exception)
{
throw;
}
}
return(String.IsNullOrEmpty(feedback) ? null : feedback);
}
public static string Grade(String MatrixMapJSON, String question, String assignment)
{
//initialize floats for total point value and their grade so far on assignment
float questionValue = 0;
float currentGrade = 0;
//Get session variables
float[,] sessionMatrix = (float[,])HttpContext.Current.Session["matrix"];
float[] sessionActualAnswer = (float[])HttpContext.Current.Session["actualAnswer"];
//int sessionMinNumOfRowsOps = (int)HttpContext.Current.Session["minNumOfRowOps"];
Boolean sessionInconsistent = (Boolean)HttpContext.Current.Session["inconsistent"];
int sessionNumOfFreeVars = (int)HttpContext.Current.Session["numOfFreeVars"];
String assignId = (String) HttpContext.Current.Session["assignment"];
string feedback = "";
//first we need to check if the homework assignment is in the database
AssignComponent.Assigner check = new AssignComponent.Assigner();
int theresanassignment = check.checkAssignmentExists(assignId);
if (theresanassignment == 1)
{
//query to fetch question's point value and their current grade on the assignment
string connStr = ConfigurationManager.ConnectionStrings["linearhmwkdb"].ConnectionString;
MySqlConnection msqcon = new MySqlConnection(connStr);
try
{
msqcon.Open();
String query = "SELECT q.pointValue, ha.grade FROM question AS q JOIN hmwkassignment AS ha WHERE ha.homeworkId=q.homeworkId AND ha.assignmentId = " + assignment + " AND q.number = " + question;
MySqlCommand msqcmd = new MySqlCommand(query, msqcon);
MySqlDataReader points = msqcmd.ExecuteReader();
points.Read();
questionValue = points.GetFloat(0);
currentGrade = points.GetFloat(1);
points.Close();
}
catch (Exception)
{
throw;
}
Dictionary<int, float[,]> MatrixMap = JsonConvert.DeserializeObject<Dictionary<int, float[,]>>(MatrixMapJSON);
MatrixBuilder.MatrixOperations mb = new MatrixBuilder.MatrixOperations();
//get the amount to deduct by dividing the total points by our approximate number of steps to solve (+1 for first matrix) (+1 for copying the answer correctly)
//shifted then rounded to keep it to 2 decimal points, then shifted back
float deductValue = (float)Math.Round((questionValue / ((float)mb.countOperationsNeeded(sessionMatrix) + 2F)) * 100F) / 100F;
//if above gives a value of 0 (a rediculously large number of steps), correct to .01 so points are actually deducted
if (deductValue == 0) deductValue = .01F;
//should probably check if the first matrix is the actual first matrix
float[,] augMatrix = null;
MatrixMap.TryGetValue(0, out augMatrix);
float[,] sessionMatrixWithIdentity = new float[sessionMatrix.GetLength(0), sessionMatrix.GetLength(1) * 2];
for (int i = 0; i < sessionMatrix.GetLength(0); i++)
{
for (int j = 0; j < sessionMatrix.GetLength(1); j++)
{
sessionMatrixWithIdentity[i, j] = sessionMatrix[i, j];
}
}
int row = 0;
for (int j = sessionMatrix.GetLength(1); j < sessionMatrixWithIdentity.GetLength(1); j++)
{
sessionMatrixWithIdentity[row, j] = 1;
row++;
}
if (!mb.checkMatrixEquality(sessionMatrixWithIdentity, augMatrix))
{
feedback += "<div>The first matrix does not match the given matrix.<div>";
}
List<int> keysToInclude = new List<int>();
for (int i =0; i < MatrixMap.Count - 1; i++)
{
keysToInclude.Add(i);
}
Dictionary<int, float[,]> MatrixMapWithoutFirstOrLast = MatrixMap.Where(kvp => keysToInclude.Contains(kvp.Key)).ToDictionary(kvp => kvp.Key, kvp => kvp.Value);
feedback += mb.checkSingleRowOperationInverseQuestion(MatrixMapWithoutFirstOrLast);
float[,] studentInverse = null;
MatrixMap.TryGetValue(MatrixMap.Count - 1, out studentInverse);
if (!mb.checkInverse(sessionMatrix, studentInverse))
{
feedback += "<div>The final matrix does not match the inverse for this matrix.<div>";
}
float grade = questionValue;
//ensure there was feedback, if not, will retain value of the question's total points
if (!feedback.Equals(""))
{
//Run through feedback, create array of statements based on . to count number of point deductions
String[] deductionStrings = feedback.Split('.');
//set grade to the total minus the deduct amount times number of mistakes
grade = questionValue - deductValue * (deductionStrings.Length - 1);
//correct any odd values from results close to 0 by re-rounding to 2 decimal points
grade = (float)Math.Round(grade * 100F) / 100F;
}
//make their grade go no lower than 0 (no negative points)
if (grade < 0) grade = 0;
//create grade to write back to database
float updatedGrade = grade + currentGrade;
//Need to display points somehow
if (grade == 1)
{
feedback += "<!-- -->";
}
feedback += "<div><strong>Points Earned: </strong>" + grade + " / " + questionValue + "<div>";
//Update grade in database
msqcon = new MySqlConnection(connStr);
try
{
msqcon.Open();
String query = "UPDATE hmwkassignment AS ha SET ha.grade = " + updatedGrade + " WHERE assignmentId = " + assignment;
MySqlCommand msqcmd = new MySqlCommand(query, msqcon);
msqcmd.ExecuteNonQuery();
}
catch (Exception)
{
throw;
}
}
else if (theresanassignment == 0)
{
feedback += "<-!- -->";
}
return String.IsNullOrEmpty(feedback) ? null : feedback;
}
