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rpaczkowski

USA
Posts
Posted - 03/30/2005 :  1:45:27 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5 SR5
Operating System: Win 2000

Me again!

I am only trying to copy the absolute value of all rows in one column into another column using:
//Find last used row
int reihe = 0;
string strinhalt;
do
{
wks.GetCell(reihe,0,strinhalt);
reihe = reihe +1;
} while (strinhalt !="");

//copy abs values in new row
int n=1;
double abso, wert;
string strwert;
for (n; n<=reihe-1; ++n)
wks.GetCell(n,0,strwert);
wert = atoi(strwert);
printf("Value row %i is %f\n ",n-1, wert);
abso=fabs(wert);
wks.SetCell(n+1,1,abso);
return;

It does not work! The output is:"Value row 10 is 0.00000". However, I have only values in rows 1 through 9 and the output tells me that the loop is only executed once with n=11. Why?

Ralph

easwar

USA
1965 Posts
Posted - 03/30/2005 :  2:33:22 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Ralph,

If I understand you correctly - you want to set say col(2) of wks to hold abs values of numbers in col(1) - you can simply do the following:


void test()
{
	Worksheet wks = Project.ActiveLayer();
	Dataset ds1(wks, 0);
	Dataset ds2(wks, 1);
	ds2 = fabs(ds1);
}



In your code by the way, perhaps the problem is there is no {} that encloses all needed statements in your for() loop.

Easwar
OriginLab
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rpaczkowski

USA
Posts
Posted - 03/30/2005 :  2:53:25 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Easwar,

for one, your method is way more elegant than mine! Secondly, I feel pretty stupid forgetting the {}. It works just fine with them. The reason is probably that I am learning C out of a book for C and the codes there are sometimes different from OC, e.g. there are no {} for a for{} loop. Thanks a lot.

Ralph

Edited by - rpaczkowski on 03/30/2005 2:56:49 PM
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easwar

USA
1965 Posts
Posted - 03/30/2005 :  3:02:21 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Ralph,

The need to put multiple statements inside {} with a for loop is standard C and not special to Origin C.

Please do not hesitate to post such questions...we don't assume that users know C programming, and we want to help as much as we can.

There is a page on our website accessible from the Support area, where we are putting together a collection of "practical" examples that show how to use Origin C for doing various things in Origin:
http://www.originlab.com/index.aspx?s=9&lm=71&pid=268

Please take a look and if you have suggestions on adding examples that would be useful, please let us know.

Easwar
OriginLab
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rpaczkowski

USA
Posts
Posted - 04/01/2005 :  08:25:24 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Easwar,

I am sure that a lot of people who start programming Origin first have to learn C andare glad to find a forum where their easy questions are answered. But then it may be a good idea to have 2 forums, one for general questions about C (and/or Labtalk) and one for C-questions specific to programming Origin. I also think that it would help to have the help-files for Origin reworked. If you look e.g. for *GetPage, you find:

PropertySheet::*GetPage
Prototype: PUBLIC PropertyPage *GetPage(int nPage)
Remarks:
Parameters:
Return values:
Example:
Summary:
Sample data:
Header file: Dialog.h
See also:

And there are many more like this. Not very helpful from my point of view.

I will think about adding more example programming examples.

Ralph
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easwar

USA
1965 Posts
Posted - 04/01/2005 :  09:46:19 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Ralph,

We are improving the Origin C language reference documentation and in the next version such instances of missing information should not be there. The page I pointed to in the previous post is a temporary solution in that sense. We will then integrate many such examples into the documentation in the next version so they are readily available in the product itself.

Easwar
OriginLab
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