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Thanks for the help, and yes the vals array can contain null values.
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No you can't avoid the two loops, you need the averages first, then the deviations, which you can't get without knowing the averages first.
IMO all you can do is clean up your code a bit, by:
- getting rid of the nullables, GetType() and typeof;
- not calling vals.Length three times;
- returning just the slope as a double;
- not calculating the intercept, unless you really need it, and then maybe provide the intercept as an out parameter (this saves the allocation of the double[2] array).
BTW: using >>1 to divide by 2 does not really help; compilers are smart enough to emit decent code to divide by 2.
BTW2: I have some doubts about the correctness of your line
double x = (double)(((numValues * (numValues - 1)) >> 1) - ((offset * (offset - 1)) >> 1));
it doesn't agree with my intuition, e.g. changing the value of offset from 0 to 1 would not change x at all??
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Thanks Luc. I was so caught up with optimising that I missed the case where offset was one will have to handle that. Good job spotting this.
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Using double not double?, and if necessary using double.NaN for missing values, should help considerably.
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I desperately need a semantic music engine working project..if anyone have their hands on it plz mail it on shaikh.bros21@gmail.com
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Posting your email address is a Very Bad Idea.
And please explain what it is you are talking about.
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Sounds complicated. It's highly unlikely that anyone here has a copy for you to have, and if they did, they would probably want a lot of money for the source. By the way, if you don't want spam, don't put your email address into a public forum.
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I'm new to Async programming. I have this method:
private void getUserInfo(string UserId)
{
var task = facebookClient.GetTaskAsync(UserId);
Action<object> action = userInfoRequestCallback;
task.ContinueWith(action);
}
the callback is
private void userInfoRequestCallback(object data)
{
Task<object> task = data as Task<object>;
IDictionary<string, object> results = task.Result as IDictionary<string, object>;
FacebookUser = new FacebookUserModel
{
UserId = (string)results["id"],
UserName = (string)results["name"],
FirstName = (string)results["first_name"],
LastName = (string)results["last_name"],
Link = (string)results["link"],
Gender = (string)results["gender"],
Locale = (string)results["locale"],
};
}
How do I return a value from the getUserInfo, so that I can do:
FacebookUserModel user = getUserInfo("someid");
Everything makes sense in someone's mind
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You don't. Application processing continues immediately after firing off the async call so you cannot return values that depend on the callback completing. The way round it is to set this value from your callback, so you will need a member variable to hold the value. Alternatively, look at the Task Parallel Library which would ease this for you considerably.
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async call = get it done at your leisure
return value = I need it as soon as you return
So the only way to get the return value is by re-synchronizing inside the method, which might defeat the whole idea of using an async call.
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I would use the new async keyword. It encapsulates everything for you including waiting for the response. Much easier then other alternatives.
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And currently only available as part of the Async CTP or Visual Studio 11 (.NET 4.5).
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I use either POHs method, have the callback populate a structure that has onpropertychage to notify the UI. Or if the caller is not the UI I send out a message, this happens when I start an application and all the static data is loaded rather than fire off multiple calls to the service I chain them using the message sink initiate the next service call.
Never underestimate the power of human stupidity
RAH
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You can't, and if you think about it you'll see why: the whole purpose of asynchronous programming is that the request returns before it completes, so you can't have the result of running the method. You have two options:
i) call the method synchronously, or
ii) accept that you won't have the result, populate a member variable in the callback and have any downstream code that might read it check whether it's initialised. (If it's not, you can either abort the process or re-queue it, possibly with a delay, depending on what you are trying to do and which is appropriate.)
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Hi I've created a windows app for a user to manage company info. I have a main form with fields(textboxes, datagrids, dates, comboboxes etc) to be completed for new companies. For any existing companies I'd like to add a search box to my main form and I suppose on the click event of a Search button I'd like to prefill the form with all the relevant data. Can anyone point in the direction to any tutorials, links that show me how to do this? I'm relatively new to C# and this is my first project using an EDM.
Thanks for your help
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Hi All,
Trying to get an Input box in C#, (it was asked for!/demanded) I have in the past used
SN = Microsoft.VisualBasic.Interaction.InputBox("Enter Serial Number", "", "", 200, 150);
with the definition
using Microsoft.VisualBasic;
I get the below error:
I'm sure of it but now get Error The type or namespace name 'Interaction' does not exist in the namespace 'Microsoft.VisualBasic' (are you missing an assembly reference?)
What am I doing wrong?
Glenn
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As the message says, you appear to be missing the reference to the assembly that contains this class. Check the references section of your project (in Solution explorer) and add the necessary item.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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If it helps, the required dll is here on my machine:
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.VisualBasic.dll
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If you don't want to use the VB-originated InputBoxes, and/or want a slightly different functionality, you can easily roll your own. That is what I did, with a base class, and some derived ones for different kinds of return types and validation rules.
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To all who replied (mostly after I chucked coding for the day!!) I have now solved the issue Thank You! The method I had used didn't work this time due to a PC rebuild moving every thing!
Thanks again
Glenn
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I have a DataGridView with three columns (checkbox, text, int). The text and int columns are bound to data from a data source. I want to manipulate in c#, which of the checkbox rows should be checked. I have the below code, however setting the value of the checkbox to true isn't displaying the required checkboxes as checked. Does anyone know how I could implement this?
…
dgvMultiCodes.AutoGenerateColumns = false;
dgvMultiCodes.DataSource = oCodeList.Table;
string SQLState = ChcekedSQLStatement();
SortedList<int, string> slCodeList = new SortedList<int, string>();
int codeCD = 0;
string desc = "";
oCodeList.GoTop();
while (!oCodeList.EoF)
{
codeCD = oCodeList.GetInteger("CD");
desc = oCodeList.GetString("DEF");
slCodeList.Add(codeCD, desc);
oCodeList.Skip();
}
bool bChecked = false;
##DataReader checkedList = new ##DataReader(SQLState, currentUser.oConnection);
while (checkedList.Read())
{
bChecked = slCodeList.ContainsKey(checkedList.GetInteger("KEYCODE"));
if (bChecked)
{
foreach (DataGridViewRow row in dgvMultiCodes.Rows)
{
if (row.Cells[dgvCodeCol.Index].Value.ToString() == checkedList.GetString("KEYCODE"))
{
row.Cells[dgvCheckCol.Index].Value = true;
break;
}
}
}
bChecked = false;
}
…
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Maybe the code I provided was a little long winded. The line of code that isn't displaying the checkbox as checked is...
row.Cells[dgvCheckCol.Index].Value = true;
Is there some other property of the checkbox cell that I need to set or do I need to refresh the cell for the checkbox to appear checked?
Thank you
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Hello Every one,
how can i insert duplicate value in HashSet
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You can't, by definition: The HashSet<(Of <(T>)>) class provides high performance set operations. A set is a collection that contains no duplicate elements, and whose elements are in no particular order.
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