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dear friend
what problem is following calculation? thanks
here gbest is a 3x4 array
for (int i =0;i<10;i++)
{
for (int j = 0;j<3;j++)
{
for (int k = 0;k<4;k++)
v[i][j][k] = w*v[i][j][k] + c1*rand()(pbestArray[i][j][k]-x[i][j][k]) + c2*rand()(gbest-x[i][j][k]);
x[i][j][k] = x[i][j][k] + v[i][j][k];
}
}
computer showed me:
error C2064: term does not evaluate to a function taking 1 arguments
error C2112: '-' : pointer subtraction requires integral or pointer operand
Li Zhiyuan
5/10/2006
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if gbest is an array, shouldn't it have the dimensions at its side?
v[i][j][k] = w*v[i][j][k] + c1*rand()(pbestArray[i][j][k]-x[i][j][k]) + c2*rand()(gbest-x[i][j][k]);
shouldn't it be:
v[i][j][k] = w*v[i][j][k] + c1*rand()*(pbestArray[i][j][k]-x[i][j][k]) + c2*rand()*(gbest[i][j][k]-x[i][j][k]);
Hope this helps...
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I guess pbestArray is a pointer to the array, so I think
pbestArray[i][j][k]-x[i][j][k]
should be
(*pbestArray)[i][j][k]-x[i][j][k]
And , as Joan Murt said, you should add "*" between rand() and ...(something after it).
May you good luck
============
Einstein
Seeing is believing.
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It flicks only in one case.
When another window(A) cover the window(B) in my app, then I minimize A and the mouse cursor becomes in the client of B, then the B flicks. Here is the code in OnMouseMove, how to solve the problem? Thanks.
void CMyDlg::OnMouseMove(UINT nFlags, CPoint point)
{
Point pt(point.x,point.y);
m_pcs->DrawCom(m_pMemGraphics);
m_pcs->DrawCtl(m_pcs->GetSelDev(pt),m_pMemGraphics);
Invalidate(FALSE);
CDialog::OnMouseMove(nFlags, point);
}
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Why are you calling Invalidate() there?
What does your WM_MOUSEMOVE handler do?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
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I check if the mouse cursor is on some area, then draw a bound box if it is.
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You should be able to just draw to a client DC without
having to go through the WM_PAINT message.
If you must use Invalidate() there, maybe following it
with an immediate call to UpdateWindow() will help...so
there's no delay before the relulting WM_PAINT message is
processed.
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Hello everyone,
How do you understand the comments from Bjarne about exception specification?
--------------------
(section 14.6.1 Checking Exception Specifications)
The way to think about exception-specifications is to assume that a function will throw any exception it can. The rules for compile-time checking exception-specifications outlaw easily detected absurdities.
--------------------
thanks in advance,
George
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Compile-time checking means you know every situations, and you rule the world. Such as:
int a = 3;
if(a != 3) {
throw Err();
}
But the spirit of exception is "exception", which means you only know to handle "some" rules, but you won't know "the rest" part. Such as:
try {
bool b = The_API_from_some_DLL();
}
Maxwell Chen
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Thanks Maxwell,
Your reply is clear and my question is almost answered. Bjarne's comment "outlaw easily detected absurdities" means?
regards,
George
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George_George wrote: Bjarne's comment "outlaw easily detected absurdities" means?
Meaning: When you expect the enemy to enter your fort from the front gate (compile-time [easily detected absurdities] ), they might enter from tunnel or from the sky.
Maxwell Chen
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Thanks Maxwell!
Cool!! You always have the same point as Bjarne's. 
regards,
George
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Do you want to know about try/catch?
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Thanks Hamid,
I want to know how to understand the following comments from Bjarne about exception specification.
--------------------
(section 14.6.1 Checking Exception Specifications)
The way to think about exception-specifications is to assume that a function will throw any exception it can. The rules for compile-time checking exception-specifications outlaw easily detected absurdities.
--------------------
regards,
George
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I think he wants to tell that you can control exceptions when your program is running.
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Thanks Hamid,
What do you mean "control exceptions"?
regards,
George
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for example you have an runtime error like file not found so if you didnt have any code for it,your program will be producting an error and finish your progra,.
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Hi Hamid,
Does your reply relates to my original question?
regards,
George
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Hi Hamid,
I am wondering how do you understand the statements, why "The way to think about exception-specifications is to assume that a function will throw any exception it can"?
--------------------
(section 14.6.1 Checking Exception Specifications)
The way to think about exception-specifications is to assume that a function will throw any exception it can. The rules for compile-time checking exception-specifications outlaw easily detected absurdities.
--------------------
regards,
George
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Hello everyone,
I usually check whether there is bad_alloc thrown to identify whether the allocation is success or not.
My question is,
Is there a way to disable bad_alloc and just to check the returned pointer NULL or not to identify allocation success or not -- which from function point of view, is as correct as the way to catch bad_alloc? Windows platform/Visual Studio is ok. I always see code does not check bad_alloc and just check the return pointer.
(My solution is to select Enable C++ Exception to No in Code Generation option in Visual Studio, not sure whether it is the most correct way.)
thanks in advance,
George
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Did you try like this
int * m_pInt;
m_pInt = new (nothrow) int [10];
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I have a float number in a varable (Ex: float m_fNumber;) that is assigned a number(ie, m_fNumber = 12.32;). How can I use SetDlgItem????(ID_FNUM,???); into the editbox?
the following error is received by using CString: ie, : str.Format("%f",m_fNumber);
error C2664: 'void ATL::CStringT<BaseType,StringTraits>::Format(const wchar_t *,...)' : cannot convert parameter 1 from 'const char [3]' to 'const wchar_t *'
I thought I could format the CString and then use SetDlgItemTextW(...,....) to put it in the editbox.
Does anyone know a solution? HELP
A C++ programming language novice, but striving to learn
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You are doing a unicode build so the Format() function is expecting a wide string as it's formating parameter. Use the _T() macro to change the string to a wide string when building a unicode app.
str.Format(_T("%f"), m_fNumber);
You may be right
I may be crazy
-- Billy Joel --
Within you lies the power for good - Use it!
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