Trying to call the procedure cycles() from within my function fibI, but the error is:
An object reference is required for the non-static field, method, or
property array_calculator.Fibonacci_panel.cycles()'
Heres the procedure
public void cycles()
{
k++;
}
and the function
public static double fibI(double input, int k)
{
if (input == 1 || input == 2)
{
return 1;
}
else
{
double fib1 = 0;
double fib2 = 1;
double fibResult = 0;
for(double i = 1; i < input; i++ )
{
fibResult = fib1 + fib2;
fib1 = fib2;
fib2 = fibResult;
cycles();
}
return fibResult; ;
}
Your "procedure" is not static. To repair you code just change:
public static void cycles() { k++; }
Moreover there isn't a "procedure" in C#. It is a normal function.
Related
I have this method:
public static string ReplaceVarReferences(string input,char open, char close)
{
string inner = "";
for (int i = 0; i < input.Length; i++)
{
if (input[i] == open)
{
i++;
string varInner = "";
while (input[i] != close)
{
varInner += input[i];
i++;
}
inner += GetVariable(varInner);
}
else
{
inner += input[i];
}
}
return inner;
}
and this memory allocation and retrieval methods:
public static Dictionary<string, string> memory = new Dictionary<string, string>();
public static string GetVariable(string key)
{
if (memory.ContainsKey(key))
{
return memory[key];
}
else
{
return key;
}
}
public static void SetVariable(string key, string value)
{
if (memory.ContainsKey(key))
{
memory[key] = value;
}
else
{
memory.Add(key, value);
}
}
I want to to return a string with the 'ReplaceVarReferences' method and return a string with multiple spaces like this:
this code is from my interpreter and not real code.
var a = hello world;
print(variable a = {a})
the 'ReplaceVarReferences' method should be able to return this with multiple spaces:
"variable a = hello world"
but instead, it returns:
"variable a = hello world"
how can I fix this?
Ok so I looked at the wrong place I have another method that had the problem:
public static string GetNested(string Open, string Close, List<string> t, ref int i)
{
string inner = "";
int nested = 0;
while (true)
{
if (i < t.Count - 1)
{
i++;
if (string.IsNullOrWhiteSpace(t[i]))
{
for (int x = 0; x < t[i].Length; x++)
{
inner += " ";
}
}
else if (t[i] == Close)
{
nested--;
if (nested > 0)
{
inner += t[i];
}
}
else if (t[i] == Open)
{
if (nested > 0)
{
inner += t[i];
}
nested++;
}
else
{
inner += t[i];
}
if (nested == 0)
{
break;
}
}
}
return inner;
}
i did not include:
if (string.IsNullOrWhiteSpace(t[i]))
{
for (int x = 0; x < t[i].Length; x++)
{
inner += " ";
}
}
and it resulted in the spaces being dumped when retrieving the nested string.
I'm having a little trouble reading values in from a database and assigning them to an array. It seem to work in my unit tests, but in practice some values are missing.
Here's my database code:
private void GetParameterValuesFromDatabase()
{
this.parameterValues = (from DataRow r in this.database.RunCommand("select * from KST_PARAM_VALUES v join DM_PARM_NAME p on v.PARM_NAME_KEY = p.PARM_NAME_KEY").Rows
where (int)r["SCENARIO_KEY"] == this.scenario.ScenarioKey
select new DatabaseParameter
{
ParameterValuesKey = r.Field<int>(0),
ProfileType = r.Field<string>(1),
ScenarioKey = r.Field<int>(2),
StressEditorKey = r.Field<int>(3),
StressClassKey = r.Field<int>(4),
PeriodKey = r.Field<int>(5),
ParameterNameKey = r.Field<int>(6),
ParameterValue = r.Field<double>(7),
ActiveStress = (r.Field<string>(8) == "Y") ? true : false,
ParameterKey = (int)r["PARM_NUMBER"]
}).ToDictionary(r => r.ParameterValuesKey, r => r);
}
Not having any issues with this part of my code, just showing for completeness.
private void LoadParameters()
{
this.GetParameterValuesFromDatabase();
// TODO: Assuming 9 periods for now, change to allow for variable periods
for (int i = 1; i <= MaxNumberOfStressPeriods; i++)
{
this.parametersByPeriod.Add(i, this.parameterValues.Where(t => t.Value.PeriodKey == i).ToDictionary(t => t.Key, t => t.Value));
}
Log.Instance.LogMessage(LogLevel.Debug, "Created parameter dictionaries from database");
// For every stress editor in the dictionary of stress editors
foreach (KeyValuePair<int, ClassList> ed in this.stressParams)
{
// For every type of class selector
foreach (ClassSelector c in Enum.GetValues(typeof(ClassSelector)))
{
// For each of the classes within each class list within the editor
for (int i = 0; i < ed.Value.ClassLists[c].Count; i++)
{
string className = ed.Value.ClassLists[c][i].Name;
// For each double array in each class
foreach (KeyValuePair<int, double[]> t in ed.Value.ClassLists[c][i].ClassVariables.EditorParameters)
{
double[] values = this.GetParameterValues(t.Key, ed.Key, className);
BasicStressEditorVariables.AddParameters(values, ed.Value, className, t.Key);
}
}
}
}
}
}
Above shows the overall LoadParameters() method.
Below we have some code that selects 9 values from the dictionary constructed from the database, ready to be added to the array.
private double[] GetParameterValues(int paramKey, int editorKey, string className)
{
double[] values = new double[9];
for (int i = 1; i <= MaxNumberOfStressPeriods; i++)
{
Dictionary<int, DatabaseParameter> temp = this.parametersByPeriod[i];
foreach (KeyValuePair<int, DatabaseParameter> d in temp)
{
if (d.Value.ParameterKey == paramKey && d.Value.PeriodKey == i && d.Value.StressEditorKey == editorKey && d.Value.ProfileType == className)
{
values[i - 1] = d.Value.ParameterValue;
}
}
}
return values;
}
Below shows getting the destination array from the dictionary, as indexes cannot be passed by reference
public static void AddParameters(double[] values, ClassList editor, string className, int paramKey)
{
// TODO: Maybe search all lists to eliminate the need for the class selector as a parameter
// TODO: Will throw an exception when nothing is found. Handle it
ParameterClass p = null;
foreach (ClassSelector c in Enum.GetValues(typeof(ClassSelector)))
{
p = editor.ClassLists[c].FirstOrDefault(f => f.Name == className);
if (p != null)
{
break;
}
}
// TODO: Notify that could not be found
if (p == null)
{
Log.Instance.LogMessage(LogLevel.Error, $"Unable to find class {className}");
return;
}
double[] dest = p.ClassVariables.editorParameters[paramKey];
AddParameterValues(values, ref dest);
}
And here's the AddParameterValues() method:
private static void AddParameterValues(double[] values, ref double[] destination)
{
if (values.Length != destination.Length)
{
return;
}
for (int i = 0; i < values.Length; i++)
{
destination[i] = values[i];
}
}
Debugging shows that some values are being loaded into the destination array, but some aren't. Could anyone tell me why this is? Or if not, point me toward some material?
Thank you for your time
I'm not that C# specialist but looking to following code as a C programmer
private double[] GetParameterValues(int paramKey, int editorKey, string className)
{
double[] values = new double[9];
//...
return values;
}
I would assume that the lifetime of values is only within the function GetParameterValues and the function GetParameterValues delivers the caller with reference to a dead variable.
What if you change the prototype to something like
private void GetParameterValues(ref double[] values, int paramKey, int editorKey, string className)
A C++ method returns the correct value when I use a conditional breakpoint, but an incorrect value without a breakpoint.
C# method which calls C++:
bool SetProperty(Element element, Node referencePoint, List<Materializer> materializers, List<ulong> properties)
{
// Loop over STLs
for (int i = 0; i < materializers.Count; i++)
{
Materializer materializer = materializers[i];
if (materializer.IsPointInside(referencePoint.X, referencePoint.Y, referencePoint.Z, pentalTreeDatasets[i].top))
{
element.PropertyId = properties[i];
return true;
};
}
return false;
}
C++ methods in the header file:
int CountIntersects(double x, double y, double z, PentalTreeNode ^root)
{
Math3d::M3d rayPoints[2], intersectionPoint;
rayPoints[0].set(x,y,z);
rayPoints[1].set(x,y,1.0e6);
if(!root)
return 0;
else
{
int special = CountIntersects(x,y,z,root->special);
if (x <= root->xMax && x >= root->xMin && y <= root->yMax && y >= root->yMin)
{
if( _stlMesh->IsRayIntersectsPoly(root->index, rayPoints, intersectionPoint))
{
return (1 + special);
}
else
return special;
}
else
{
if (y>root->yMax)
{
return (CountIntersects(x,y,z,root->top)+special);
}
else if(y<root->yMin)
{
return (CountIntersects(x,y,z,root->bottom)+special);
}
else if(x<root->xMin)
{
return (CountIntersects(x,y,z,root->left)+special);
}
else if(x>root->xMax)
{
return (CountIntersects(x,y,z,root->right)+special);
}
else
return special;
}
}
}
bool IsPointInside(double x, double y, double z, PentalTreeNode ^root)
{
int intersectionCount = 0;
Math3d::M3d rayPoints[2], intersectionPoint;
rayPoints[0].set(x,y,z);
rayPoints[1].set(x,y,1.0e6);
if(_box->IsContainingPoint(x,y,z))
{
intersectionCount=CountIntersects(x,y,z,root);
return (intersectionCount%2!=0);
}
}
C++ methods in other header files:
bool IsRayIntersectsPoly(int nPolygonIndex, Math3d::M3d RayPoints[2], CVector3D& IntersectionPoint)
{
CMeshPolygonBase& Poly = m_PolygonArray[nPolygonIndex];
CArrayResultI Result;
int* pPolygonPoints = GetPolygonPoints(Poly, Result);
Math3d::MPlane TrianglePlane;
double Atmp[3], A;
CVector3D* pPoints[3];
pPoints[0] = &m_PointArray[*pPolygonPoints].m_Position;
for(int i = 1; i < Result.GetSize() - 1; i++)
{
pPoints[1] = &m_PointArray[*(pPolygonPoints+i)].m_Position;
pPoints[2] = &m_PointArray[*(pPolygonPoints+i+1)].m_Position;
TrianglePlane.Init(*pPoints[0], *pPoints[1], *pPoints[2]);
TrianglePlane.IntersectLine(RayPoints[0], RayPoints[1], IntersectionPoint);
A = GetTriangleArea(*pPoints[0], *pPoints[1], *pPoints[2]);
for(int j = 0; j < 3; j++)
{
Atmp[j] = GetTriangleArea(*pPoints[j], *pPoints[(j+1)%3], IntersectionPoint);
}
if( fabs(A - Atmp[0] - Atmp[1] - Atmp[2]) < 1.0e-5 ) return true;
}
return false;
};
double GetTriangleArea(CVector3D& T1, CVector3D& T2, CVector3D& T3)
{
double a, b, c, s;
a = (T1 - T2).length();
b = (T2 - T3).length();
c = (T3 - T1).length();
s = 0.5 * (a + b + c);
return( sqrt(s * (s - a)* (s - b)* (s - c)) );
}
When I start the program which calls SetProperty() within the for-loop, the results for some iterator values are wrong. When I set conditional breakpoints for critical iterator values in the for-loop and step over it, then the result is OK for that item. What may be the problem?
This is method in which I post breakpoint. For example, for critical element.Id==2393.
private void StartButton_Click(object sender, EventArgs e)
{
DateTime startTime = DateTime.Now;
List<Materializer> materializers = new List<Materializer>();
List<ulong> properties = new List<ulong>();
// Load STLs
for (int i = 0; (int)i < (this.dataGridView.RowCount - 1); i++)
{
if (dataGridView.Rows[i].Cells[1].Value != null && (string)dataGridView.Rows[i].Cells[1].Value != "")
{
Materializer materializer = new Materializer();
materializer.LoadSTLMesh(dataGridView.Rows[i].Cells[0].Value.ToString());
materializers.Add(materializer);
properties.Add((ulong)dataGridView.Rows[i].Cells[1].Tag);
}
}
CreatePentalTrees(materializers);
int processedElementCount = 0;
int changedElementCount = 0;
// Loop over elements
foreach (Element element in model.ElementsList.Values)
if ((element.Topology == 7 || element.Topology == 8) && !lockedProperties.ContainsKey(element.PropertyId)) // 3D elements only
{
Node center = this.CenterPoint(element, model.NodesList);
if (element.Id == 2393)
{
//if breakpoints thats ok, else not ok
Console.WriteLine(element.Id);
Console.WriteLine(element.PropertyId);
}
if (SetProperty(element, center, materializers, properties)) // Check for center point
{
//changedElements.Add(element.Id, true);
changedElementCount++;
}
else
{
// Check for all nodes if center point does not belong to any STL
int[] nodeOrder;
switch (element.Topology)
{
case 7:
nodeOrder = wedgeNodeOrder;
break;
case 8:
nodeOrder = brickNodeOrder;
break;
default:
throw new Exception("Unknown topology " + element.Topology.ToString());
}
for (int i = 0; i < nodeOrder.Length; i++)
{
Node node = model.NodesList[element.NodeIds[nodeOrder[i]]];
if (SetProperty(element, node, materializers, properties))
{
//changedElements.Add(element.Id, true);
changedElementCount++;
break;
}
}
}
if (++processedElementCount % 100 == 0)
{
labelTime.Text = "Changed/processed elements: " + changedElementCount.ToString() + "/" + processedElementCount.ToString();
labelTime.Refresh();
Application.DoEvents();
}
}
DateTime endTime = DateTime.Now;
labelTime.Text = "Total time: " + (endTime - startTime).TotalSeconds.ToString() + " s";
MessageBox.Show("Completed.");
SaveFileDialog saveFileDlg = new SaveFileDialog();
saveFileDlg.Title = "Save FEMAP neutral file";
saveFileDlg.Filter = "(*.neu)|*.neu";
if (saveFileDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
FemapNeutral.ExportNeu(saveFileDlg.FileName, model);
}
}
You seem to be calling a lot of methods you haven't listed, and/or the wall of code made me get lost. Adding that code won't help: reducing your problem to a simpler one that demonstrates the problem might.
However, the most likely cause of your problem, if you have unmanaged code reading managed data, is that you failed to marshal or pin the data prior to using the managed code.
Unpinned data can be moved around by the garbage collector in unexpected ways.
I'm making a WP7-app for my programming class and I want to implement a callback function for checking the state of an integer and not calling the function for checking it explicitly. The integer iterates at the push of a button and when it reaches it's max input I would like to have a callback function checking this, but I'm not completely sure how to implement it.
private void Right_Button_Click(object sender, RoutedEventArgs e)
{
if (current_input <= MAX_INPUT)
{
user_input[current_input] = 3;
current_input++;
display_result();
}
}
#endregion
void display_result()
{
//will move alot of this to the a result page
DateTime time_end = DateTime.Now;
TimeSpan difference = time_end.Subtract(timer);
time_stamp = difference.ToString();
bool combination_error = true;
if (current_input == 4)
{
for (int i = 0; i < MAX_INPUT; i++)
{
if (user_input[i] != combination[i])
{
combination_error = false;
break;
}
}
if (combination_error)
{
MessageBox.Show("Correct combination The timer is " + time_stamp);
}
else
{
MessageBox.Show("Wrong combination");
}
}
}
It's after I increment current_input that I now explicitly call display result something I wish not to do and instead create a callback function for it.
You can't really put a callback function on an integer, however, you could expose your integer as a property and call a function from the property setter. Look at this example:
private int _myInteger = 0;
private int MyInteger {
get
{
return _myInteger;
}
set
{
_myInteger = value;
if (_myInteger <= MAX_INPUT)
MyCallBackFunction();
}
}
private void Right_Button_Click(object sender, RoutedEventArgs e)
{
MyInteger = MyInteger + 1;
// Do your other stuff here
}
private void MyCallBackFunction()
{
// This function executes when your integer is <= MAX_VALUE
// Do Whatever here
display_result();
}
What this is doing is exposing your integer through a private property. As long as you set the property through the setter (e.g. use the MyInteger = MyInteger + 1; syntax), you can have your setter check the condition and execute your call back function.
I have two words:
Source: John
ConvertTo: Jack
and I want to show the effect of convert all letters from "Source" at the same time to the "ConvertTo" word. I already create a program to accomplish that but processing one letter at a time, to show the effect I use Threads, the thing is that to process all letters at the same time I suppose I need one thread per letter, and every thread will call the same function that process the letter, and I use global variables.
Here is the code (works only for texts with same lenght):
private void button1_Click(object sender, EventArgs e)
{
lblResult.Text = "";
lblResult2.Text = "";
ThreadPool.QueueUserWorkItem(new WaitCallback(Process));
}
int movement = 0;
string CumulateText;
private void Process(object stateinfo)
{
int value;
int operation; //0->[+] 1->[-]
CumulateText = "";
for (int i = 0; i <= textBox1.Text.Length - 1; i++)
{
if (textBox1.Text[i] != ' ')
{
value = (char)textBox1.Text[i] - (char)textBox2.Text[i];
if (value >= 0)
operation = 1;
else
operation = 0;
for (int ii = 0; ii <= Math.Abs(value); ii++)
{
if (operation == 1)
movement = (char)textBox1.Text[i] - ii;
else
movement = (char)textBox1.Text[i] + ii;
this.Invoke(new EventHandler(ShowMovement));
System.Threading.Thread.Sleep(10);
}
}
CumulateText += textBox2.Text[i].ToString();
}
}
private void ShowMovement(object sender, EventArgs e)
{
lblResult.Text = CumulateText + Convert.ToString((char)movement);
}
I hope I made myself understood.
please any advise to accomplish that.
thanks
To clarify more what I want to accomplish here is an example:
Source: John
ConvertTo: Jack
J - same J
o - decrease till a (o, n, m, ..., a)
h - decrease till c (h, g, f, ..., c)
n - decrease till k (n, m, l, k)
I once had to do something similar for a small little project I was working on for fun.
I do not see why you would need to create a thread for each letter to create a transition between two words unless I'm not understanding what you are pretending to do correctly.
Check and study the following code, see if its any help:
static class Program
{
static void Main()
{
TextTranstition transition = new TextTranstition();
transition.TransitionFinished += TransitionTicked;
transition.TransitionTicked += TransitionTicked;
transition.StartTransition("AmazingWordTransition", "MyNewWordAppearing", 100);
Thread.CurrentThread.Join();
Console.ReadKey();
}
public static void TransitionTicked(object sender, TranstitionEventArgs e)
{
Console.Clear();
Console.Write(e.TransitionText);
}
}
public class TranstitionEventArgs : EventArgs
{
private readonly string transitionText;
public string TransitionText { get { return this.transitionText; } }
public TranstitionEventArgs(string transitionText)
{
this.transitionText = transitionText;
}
}
public class TextTranstition
{
private struct StartInfo
{
public StartInfo(string initialText, string finalText, int timeStep)
{
this.initialText = initialText;
this.finalText = finalText;
this.timeStep = timeStep;
}
private readonly string initialText;
public string InitialText { get { return this.initialText; } }
private readonly string finalText;
public string FinalText { get { return this.finalText; } }
private readonly int timeStep;
public int TimeStep { get { return this.timeStep; } }
}
public EventHandler<TranstitionEventArgs> TransitionFinished;
public EventHandler<TranstitionEventArgs> TransitionTicked;
public void StartTransition(string initialText, string finalText, int timeStep)
{
StartInfo startInfo = new StartInfo(initialText, finalText, timeStep);
Thread t = new Thread(startTransition);
t.Start(startInfo);
}
private void startTransition(object info)
{
StartInfo startInfo = (StartInfo)info;
string initialText = startInfo.InitialText;
string finalText = startInfo.FinalText;
if (initialText.Length < finalText.Length)
{
initialText = initialText.PadRight(finalText.Length);
}
if (TransitionTicked != null) TransitionTicked(this, new TranstitionEventArgs(initialText));
while ((initialText = transition(initialText, finalText)) != finalText)
{
Thread.Sleep(startInfo.TimeStep);
if (TransitionTicked != null) TransitionTicked(this, new TranstitionEventArgs(initialText));
}
if (TransitionFinished != null) TransitionFinished(this, new TranstitionEventArgs(finalText));
}
private string transition(string initialText, string finalText)
{
StringBuilder b = new StringBuilder(finalText.Length);
for (int i = 0; i < finalText.Length; i++)
{
char c = initialText[i];
int charCode = (int)c;
if (c != finalText[i])
{
if (charCode == 122 || charCode==32) charCode = 65;
else if (charCode == 90) charCode = 97;
else
{
charCode += 1;
}
}
b.Append((char)charCode);
}
return b.ToString();
}
}
Use BackgroudWorker for this kind of stuff.