I am trying to sum up each arraylist within an arraylist. I am assuming you use the get method. but I am not sure how to do this exactly. This is what I have so far. As indicated by the arrows is were I am trying to add up the arraylist before it starts on the new arraylist. Any ideas?????
public void sparseCountTimer(ArrayList arraylist)
{
double totalRowsCount = 0.0;
long totalTime = 0;
for (int x = 0; x < iteration; x++)
{
long startTime2 = 0,
estimatedTime2 = 0;
double rowTotal = 0.0,
lastRowTotal = 0.0;
for( int i = 0; i < matrixDimension; ++i)
{
if (lastRowTotal < rowTotal)
{
lastRowTotal = rowTotal;
startTime2 = System.nanoTime();
}
rowTotal = 0.0;
for (int j = 0; j < matrixDimension; ++j)
{
>>>>>>>>> rowTotal += arraylist.get(j).get(i); <<<<<<<<<<<<<<
}
estimatedTime2 = System.nanoTime() - startTime2;
}
totalRowsCount += lastRowTotal;
totalTime += estimatedTime2;
}
}
Related
I'm tring to access the values of a dictionary property in a grid,such as Fluvial facies or lithologies etc.I have read the coursebook and help docs, but didn't find anything relevant.The coursebook only has examples of creating properties, but not accessing properties.Below is the code I tried:
Grid grid = arguments.Input_Grid;
if (grid == null)
{
PetrelLogger.ErrorStatus("HelloGrid: Arguments cannot be empty.");
return;
}
Index3 currentCell = new Index3();
int maxI = grid.NumCellsIJK.I;
int maxJ = grid.NumCellsIJK.J;
int maxK = grid.NumCellsIJK.K;
for (int i = 0; i < maxI; i++)
{
for (int j = 0; j < maxJ; j++)
{
for (int k = 0; k < maxK; k++)
{
currentCell.I = i; currentCell.J = j; currentCell.K = k;
if (grid.IsCellDefined(currentCell) && grid.HasCellVolume(currentCell))
{
//DictionaryProperty p = ???
//int val = p[currentCell] ???
}
}
}
}
You need to use the "FastDictionaryPropertyIndexer" or "FastPropertyIndexer" for regular properties.
foreach (var dictProp in grid.DictionaryProperties)
{
int numCellsI = dictProp.NumCellsIJK[0];
int numCellsJ = dictProp.NumCellsIJK[1];
int numCellsK = dictProp.NumCellsIJK[2];
float[] values = new float[dictProp.NumCells];
var dpsa = dictProp.SpecializedAccess;
using (var fdpi = dpsa.OpenFastDictionaryPropertyIndexer())
{
int index = 0;
for (int k = 0; k < numCellsK; k++)
{
for (int j = 0; j < numCellsJ; j++)
{
for (int i = 0; i < numCellsI; i++)
{
values[index] = fdpi[i, j, k];
index++;
}
}
}
}
}
You also need to be careful about the indexing since it varies by project. For instance, you may need to reverse the order of traversal in the J direction or you could end up with some strange results.
I have this code. I'm dealing with the N-Queen problem.
The problem is when I wanna show results by screen, the arrays are not ordered. But in this code I can't order them using Comparator. It's very strange because in other Class it works perfectly using Comparator, but here it doesn't work. Hope anyone could help me. Thanks in advance.
import java.util.*;
public class NReinas {
public static void resolverReinas(int n){
String[][] tablero;
tablero = generarTablero(n);
ubicarReina(tablero, 0, n);
}
public static void ubicarReina(String[][] tablero, int etapa, int n){
ArrayList <int[]> resultados = new ArrayList<>();
for(int i = 0; i < tablero.length; i++){
if(isValido(tablero, i, etapa)){
tablero[i][etapa] = "R";
if(etapa < tablero.length - 1){
ubicarReina(tablero, etapa + 1, n); //Recursividad
}else {
resultados.add(devolverSolucion(tablero, n));
}
tablero[i][etapa] = " "; //Backtracking: vaciamos el tablero
}
}
//The ArrayList I want to order by int arrays
for (int[] r : resultados) {
System.out.println(Arrays.toString(r));
}
}
public static boolean isValido(String[][] tablero, int i, int etapa){
for(int x = 0; x < etapa; x++){
if(tablero[i][x].equals("R")){
return false;
}
}
for(int j = 0; j < tablero.length && (i-j) >= 0 && (etapa-j) >=0; j++){
if(tablero[i - j][etapa - j].equals("R")){
return false;
}
}
for(int j = 0; j < tablero.length && (i + j) < tablero.length && etapa - j >= 0; j++){
if(tablero[i + j][etapa - j].equals("R")){
return false;
}
}
return true;
}
public static String[][] generarTablero(int length){
String[][]res = new String[length][length];
for (int i = 0; i < res.length; i++) {
for (int j = 0; j < res.length; j++) {
res[i][j] = " ";
}
}
return res;
}
public static int[] devolverSolucion(String[][] tablero, int n){
int[] solucion = new int[n];
for (int i = 0; i < tablero.length; i++) {
for (int j = 0; j < tablero.length; j++) {
if(tablero[i][j] == "R"){
solucion[i] = j;
}
}
}
return solucion;
}
}
Try Using Integer instead of int and save array values on List instead, so you can use sort them
List<Integer> list = Arrays.asList(solucion);
Collections.sort(list);
If you insist in using and array you can reconverti the list to an array
(Integer[]) list.toArray();
I'm trying to code a markowitz optimization class in C# but the optimization results not good enough. Portfolio weights are differing from matlab's and excel's solutions by average 0.2%. I checked my covariance matrix calculation and the other calculations and find that they are true. Is there a way to calibrate model's tolerance or something other for getting better results? There is my code.
public List<OptimalWeight> CalcOptimalWeights(bool isNegativeAllowed,string method)
{
List<OptimalWeight> weightsResult = new List<OptimalWeight>();
List<List<CovarItem>> covariances = new List<List<CovarItem>>();
covariances = CalcCovariances();
int n = this.AssetReturnList.Count();
SolverContext solver = SolverContext.GetContext();
Model model = solver.CreateModel();
if(isNegativeAllowed == false)
{
Decision[] weights = new Decision[n];
for (int i = 0; i < n; i++)
{
model.AddDecision(weights[i] = new Decision(Domain.RealNonnegative, null));
}
model.AddConstraint("SumWeights", Model.Sum(weights) == 1);
if(this.Constraints.Count() == 0)
{
if (method == "MinVar")
{
Term portVar = 0.0;
for (int i = 0; i < n; i++)
{
for (int j = 0; j < n; j++)
{
portVar += weights[j] * covariances[j][i].Covar * weights[i];
}
}
model.AddGoal("MinVarPort", GoalKind.Minimize, portVar);
Solution solution = solver.Solve();
var report = solution.GetReport();
var decisions = solution.Decisions;
List<double> d = decisions.Select(x => x.GetDouble()).ToList();
for(int i = 0 ; i < n; i++)
{
weightsResult.Add(new OptimalWeight {AssetId = AssetReturnList[i].AssetId,
Symbol = AssetReturnList[i].Symbol,
Weight = d[i] });
}
double pvar = solution.Goals.First().ToDouble();
}
}
}
return weightsResult;
}
I'm trying to create a basic function that calls on a method that creates the 2D ArrayList that will be used further in the main program to do things like calculate the row and column sums as well as print out the triangle.
However, after it runs the ArrayList returns null. What's going on?
Thanks,
public class Trib
{
private ArrayList<ArrayList<Integer>> triangle;
private int Asize;
public Trib (int size)
{
// convert the argument to type 'int' to be used in the program
Asize = size;
// create an ArrayList of ArrayLists, it will have 'size' number ArrayLists contained within
ArrayList<ArrayList<Integer>> triangle = new ArrayList<ArrayList<Integer>>(size);
// create the inner ArrayLists
for (int i = 0; i < size; i++)
{
// add to index 'i' of our ArrayList a new ArrayList of size (i+1)
triangle.add(new ArrayList<Integer>(i+1));
for (int j = 0; j <= i; j++)
{
if (j==0 || j == i)
{
triangle.get(i).add(1);
}
else
triangle.get(i).add(triangle.get(i-1).get(j-1)+triangle.get(i-1).get(j));
System.out.print(triangle.get(i).get(j) + " ");
}
System.out.println();
}
triangle.clone();
}
public void printTriangle()
{
System.out.print(triangle.get(1).get(1));
/*for (int i = 0; i < Asize; i++)
{
for (int j = 0; j <= i; j++)
{
System.out.print(triangle.get(1).get(1) + " ");
}
System.out.println();
}*/
}
/*public Trib()
{
this(5);
}*/
/*public int Psize()
{
return triangle.size();
}
public ArrayList<Integer> sumRows()
{
ArrayList<Integer> row_sum = new ArrayList<Integer>(Asize);
for (int i = 0; i < Asize; i++)
{
for (int j = 0; j < i; j++)
{
row_sum.add(triangle.get(i).get(j));
}
}
return row_sum;
}
public ArrayList<Integer> sumCols()
{
ArrayList<Integer> col_sum = new ArrayList<Integer>(Asize);
for (int i = 0; i < Asize; i++)
{
for (int j = 0; j < i; j++)
{
col_sum.add(triangle.get(i).get(i));
}
}
return col_sum;
}*/
public static void main(String[] args)
{
if(args.length < 1)
{
System.err.println("Sorry, this program needs an integer argument.");
System.exit(1);
}
Trib pt = new Trib(Integer.parseInt(args[0]));
pt.printTriangle();
//ArrayList<Object> sum_rows = new ArrayList<Object>(pt.Psize());
// sum_rows.add;
System.out.println("\nHere are the sum of rows:");
//for (int i = 0; i < pt.Psize(); i++)
//System.out.println(sum_rows.get(i));
//ArrayList<Integer> sum_cols = new ArrayList<Integer>(pt.Psize());
System.out.println("\nHere are the sum of columns:");
//for (int i = 0; i < pt.Psize(); i++)
//System.out.printf("%-5d", sum_cols.get(i));
}
}
Watch out what's what you are doing: Notice that you have TWO variables named "triangle": The first one is an instance variable and the second is a local variable, which is the only one you have initialized.
My suggestion to avoid this common mistake is to pre-pend "this." to any use of what you intend must be an instance variable. And, if in doubt, if you use a development environment as Eclipse, press CTRL and click on your variable to navigate to the point where it is declared.
i have a working program where i can add an array to a Zedgraph and show this in a form.
Now i only want to change the display of the x-axis from points (0..400) to frequency (9e3..6e9 Hz).
Here are my currently working functions:
public void AddGraph(double[] Values, string LegendName)
{
int i = 0;
PointPairList list = new PointPairList();
for (i = 0; i < Values.Length; i++)
{
list.Add(i, Values[i]);
}
if (i > MaxXAxis)
MaxXAxis = i;
SList.Add(list);
SListColor.Add(Color.Black);
}
SListName.Add(LegendName);
}
public void ShowDiagram(string Title, string XAxisName, string YAxisName,
int Timeout_ms)
{
ZedGraph.ZedGraphControl zgc = new ZedGraphControl();
GraphPane myPane = zgc.GraphPane;
LineItem myCurve = null;
// Set the titles and axis labels
myPane.Title.Text = Title;
myPane.XAxis.Title.Text = XAxisName;
myPane.YAxis.Title.Text = YAxisName;
for (int i = 0; i < SList.Count(); i++)
{
myCurve = myPane.AddCurve(SListName[i], SList[i], SListColor[i],
SymbolType.None);
myCurve.Line.Width = 2;
}
// Add gridlines to the plot, and make them gray
myPane.XAxis.MinorGrid.IsVisible = true;
myPane.YAxis.MinorGrid.IsVisible = true;
myPane.XAxis.MinorGrid.Color = Color.LightGray;
myPane.YAxis.MinorGrid.Color = Color.LightGray;
myPane.XAxis.MinorGrid.DashOff = 0;
myPane.YAxis.MinorGrid.DashOff = 0;
myPane.XAxis.MajorGrid.IsVisible = true;
myPane.YAxis.MajorGrid.IsVisible = true;
myPane.XAxis.MajorGrid.Color = Color.Gray;
myPane.YAxis.MajorGrid.Color = Color.Gray;
myPane.XAxis.MajorGrid.DashOff = 0;
myPane.YAxis.MajorGrid.DashOff = 0;
// Move Legend to bottom
myPane.Legend.Position = LegendPos.Bottom;
zgc.AxisChange();
myPane.XAxis.Scale.Max = MaxXAxis;
zgc.Location = new Point(0, 0);
zgc.Size = new Size(panel_diagramm.ClientRectangle.Width, panel_diagramm.ClientRectangle.Height);
panel_diagramm.Controls.Add(zgc);
}
How can i change the above two functions that they display the frequency in the x-axis?
I already tried to change the AddGraph-function to pass the needed parameters and to calculate the list to have the correct values. But what then...?
public void AddGraph_Frequency(int **Points**, double **StartFrequency**,
double **StopFrequency**, double[] Values, string GraphColor, string LegendName)
{
...
double frequency = StartFrequency; //der erste Punkt
double Intervall = (StopFrequency - StartFrequency) / Points;
for (i = 0; i < Points; i++)
{
list.Add(frequency, Values[i]);
frequency = frequency + Intervall;
}
....
}
Thanks for any help
best regards
Solved.
Missing was:
myPane.XAxis.Scale.Max = Stopfrequency;
myPane.XAxis.Scale.Min = Startfrequency;