C / C++ / MFC Discussion Boards

Nelek29-Jul-07 21:15

29-Jul-07 21:15

The best option is check those libs out and choose the one that has what you need. But I thing there is not any operation you need in the standard "math.h" and "math.lib". Anyways... they are not difficult. Every operation from the list can be solved programmng your own functions with in a short code. I.E.

Matrix Multiplication

double A[M1][N1];
double B[M2][N2];
double C[M3][N3];

//I suppose A and B are already with datas inside
//(m1 x n1) x (m2, n2) = (m1 x n2) dimension of matrix, where n1 and m2 have to be the same
void Mult_Matrix (int m1, int n1, int m2, int n2) 
{	int i = 0, j = 0, k = 0;
	if (n1 != m2) //Matrix can't be multiplied
		return; 

	for (i = 0; i < m1; i++)
	{
		for (j = 0; j < n2; j++)
		{
			while (k < n1)
				C[i][j] += A[i][k] * B[k][j];
		}
	}
}

And the rest are to be not difficult. By the way... I have done it in the samplest way. You can give a pointer to your class CMatrix as return, give error messages and so on... It depends on what you need/want to do. Try it and ask if you have problems, we'll help you.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Re: Mathematics library

Shashi.Shinde29-Jul-07 21:31

Shashi.Shinde

29-Jul-07 21:31

Thnaks U Nelek,

As per ur suggestion, I had already implemented & verified listed operations, but our client wanna standard libraries about the same. So that I requires the libraries for the same routine.

Client is interested in libraries coz there are lacs of data elements in matrices & we've to operate on it.

So request you to inform me about higher performance math libs.

Thanks & regards,

Shashikant

Re: Mathematics library

Nelek29-Jul-07 21:46

Nelek

29-Jul-07 21:46

Sorry but i can not help you with it. I usually made my own functions, because the most of the times there are always some particularities that made the libs useless for me. So I don't know much about libs and so on.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Re: Mathematics library

Shouvik Das29-Jul-07 23:43

Shouvik Das

29-Jul-07 23:43

Why not use MATLAB. You can integrate MATLAB very well with C/C++.

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

Re: Mathematics library

Shashi.Shinde30-Jul-07 0:06

Shashi.Shinde

30-Jul-07 0:06

Dear Sir,
Thanks for suggestion.

With regards,

Shashikant

Re: Mathematics library

beko29-Jul-07 23:59

beko

29-Jul-07 23:59

Check MTL (Matrix Template Library)
Check TNT and JAMA

Hope this helps

Re: Mathematics library

Shashi.Shinde30-Jul-07 0:06

Shashi.Shinde

30-Jul-07 0:06

Dear Sir,
Thanks for suggestion.

With regards,

Shashikant

Re: Mathematics library

Iain Clarke, Warrior Programmer30-Jul-07 1:01

Iain Clarke, Warrior Programmer

30-Jul-07 1:01

Do you have a URL for the MTL? My google search found lots of academic bits talking about it, but not the home itself.

I've rolled my own, but it would be good to have an external one for use too.

Iain.

Re: Mathematics library

Shashi.Shinde30-Jul-07 1:18

Shashi.Shinde

30-Jul-07 1:18

Dear Sir,
Thanks for suggestion.

With regards,

Shashikant

Re: Mathematics library

Nemanja Trifunovic30-Jul-07 2:40

Nemanja Trifunovic

30-Jul-07 2:40

Boost uBLAS[^] may be what you need.

Programming Blog
utf8-cpp

Re: Mathematics library

Eytukan30-Jul-07 3:48

Eytukan

30-Jul-07 3:48

Dear Sir,
Thanks for suggestion.

With regards,
Roll eyes | :rolleyes:

He's become a household word in the Lounge. A whole new phraseology has evolved. Post a link or reply with a smiley and rose, and you've made a "Satipsism". So what? It's an interesting thing about the Internet, the evolution (as in change, not progress) of tone, quality, terminology, etc.

-Marc Clifton.

Best wishes to Rexx[^

handle of SDI application

rp_suman29-Jul-07 20:51

rp_suman

29-Jul-07 20:51

How to get the handle of SDI application similar to getting handle in Dialog-based application like: (CWnd*)AfxGetApp()->m_pMainWnd?
Any help would be greatly appreciable,
Best Regards,
Suman

Re: handle of SDI application

prasad_som29-Jul-07 21:08

prasad_som

29-Jul-07 21:08

You can follow same method.
m_pMainWnd represent main window object, associated with application.
So it does not matter, what application type is. In case of SDI it will represent main frame window associated with application.

Prasad
MS MVP - VC++

Re: handle of SDI application

rp_suman30-Jul-07 21:09

rp_suman

30-Jul-07 21:09

Is it OK to get the handle inside PreCreateWindow() of SDI application? I have tried that, and it is giving NULL.
Thanks for the help!!
Best Regards,
Suman

Re: handle of SDI application

prasad_som30-Jul-07 21:14

prasad_som

30-Jul-07 21:14

rp_suman wrote:
Is it OK to get the handle inside PreCreateWindow() of SDI application?

No, at as name indicates, window is yet to create.

Prasad
MS MVP - VC++

How this expression get's executed

hari prasad sathpadi29-Jul-07 20:38

hari prasad sathpadi

29-Jul-07 20:38

can any one explain the sequence steps how x value changes.

x=x++ + ++x + ++x + --x;
printf("%d",x);

y=x++ + ++x + ++x + --x;
printf("%d",x);
printf("%d",y);

I executed this exp in vc++ i got 1st exp values as x=14
and in second exp i got x=4 and y=14.

Re: How this expression get's executed

cp987629-Jul-07 20:58

cp9876

29-Jul-07 20:58

It's GOT to be homework!

Peter
"Until the invention of the computer, the machine gun was the device that enabled humans to make the most mistakes in the smallest amount of time."

Divide By Zero/NULL pointer exceptions

vikramlinux29-Jul-07 20:37

vikramlinux

29-Jul-07 20:37

Hi All,
Under Microsoft C++ compiler Divide by Zero and NULL pointers can be catched using
try
{
}
catch(...)
{
// exception handling
}

When I try it under the GCC on unix platforms it does not catch it. Simply "Segmantation fault" is thown outside and program terminates.

I am just wondering that above mentioned exceptions and not part of C++ standard?

If so, anybody have any more information on this?

Re: Divide By Zero/NULL pointer exceptions

Stephen Hewitt30-Jul-07 15:38

Stephen Hewitt

30-Jul-07 15:38

MSVC6 is crap; GCC is behaving correctly according to the C++ standard. The catch keyword is only meant to be able to catch C++ exceptions thrown with the throw keyword; not arbitrary hardware exceptions. Later versions of MSVC corrected this behaviour but added the /EH?[^] switch to choose between to two behaviours.

Steve

how to add rightclick mouse buttons in scintila wnd

mirraa29-Jul-07 20:14

mirraa

29-Jul-07 20:14

hi i'm programming a document using scintilla wnd...
here on right clicking mouse button my own popup menu should come..but by default it is showing some popup menu with cut,copy,paste...
i have added mine using RButtonUp function but it is not sensing that function...any help please..thanx in advance...

Re: how to add rightclick mouse buttons in scintila wnd

Iain Clarke, Warrior Programmer30-Jul-07 1:04

Iain Clarke, Warrior Programmer

30-Jul-07 1:04

Have you tried overriding OnRButtonDown? After all, that happen first...

Or checked if there's an overridable member OnContextMenu?

Lastly, have you added the macros (ON_WM_RBUTTONetc) to your message map? You need to hook up your handler as well as write it.

Iain.

Re: how to add rightclick mouse buttons in scintila wnd

mirraa30-Jul-07 1:30

mirraa

30-Jul-07 1:30

yah!i have tried with adding WM_RBUTTONUP message using class wizard but it is not at all sensing the function when i press rightmousebutton ...even i tried with WM_RBUTTONDOWN through class wizard,neither is working....

i have avoided the default scintilla wnd's popmenu also by using SCI_USEPOPUP(false)...

as you said these WM_RBUTTONUP are working well in other windows not in scintilla wnd...
any help thanx in advance....

Delete a file

Maynka29-Jul-07 20:06

Maynka

29-Jul-07 20:06

Hi,
How i can delete a file at an specified location.Is there any function which does this.

Regards,

Re: Delete a file

_AnsHUMAN_ 29-Jul-07 20:09

_AnsHUMAN_

29-Jul-07 20:09

The DeleteFile function deletes an existing file.
BOOL DeleteFile(
LPCTSTR lpFileName
);

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: Delete a file [modified]

Roberto Italy29-Jul-07 20:13

Roberto Italy

29-Jul-07 20:13

If you want to be more portable across various platforms:
int unlink(const char *filename)

-- modified at 2:23 Monday 30th July, 2007

Roberto

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