Solved

length of a multi dim array

Posted on 2009-05-11
7
361 Views
Last Modified: 2012-05-06
 Is use   TImageFilterREAL =  array of array of Real; in many procedure I shift theses data through all my code.  I do not want to pass the dim. of this array also between the procedure calls

How to get the length of an multidimensional array, the length command just uses the
length of the first array
type ;

         TImageFilterREAL =  array of array of Real;

 

 

procedure LoadArrayfromCSVFile(aFilename: String; aImageFilterREAL : TImageFilterREAL);

....

begin

....    

      setlength( aImageFilterREAL, CSVWordlist.Count, CSVFile.Count);

 

......

 

 

 

here comes the problem 

 

            LoadArrayfromCSVFile(myOpenDialog.FileName,  aImageFilterREAL );

 

                            //  another array     //  use second dim of this array 

            setlength(MyScaleData,          length(  aImageFilterREAL[0]));

 

 

 

end;

Open in new window

0
Comment
Question by:BdLm
  • 3
  • 2
  • 2
7 Comments
 
LVL 26

Accepted Solution

by:
Russell Libby earned 450 total points
ID: 24356330
Because both dimension are open, you need to check one of the elements for its length.

Eg:

var  x:             TImageFilterREAL;
     dim1, dim2:    Integer;
begin

  SetLength(x, 10, 20);

  dim1:=Length(x);
  dim2:=Length(x[0]);

// dim1 = 10
// dim2 = 20

Regards,
Russell

0
 
LVL 37

Assisted Solution

by:Geert Gruwez
Geert Gruwez earned 50 total points
ID: 24358301
why not use a Variant ?
0
 
LVL 26

Expert Comment

by:Russell Libby
ID: 24358503
What would be the reason for a variant if the author is only storing real values? Its 10 additional bytes per entry.
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 8

Author Closing Comment

by:BdLm
ID: 31580209
I tried myseld also with length(X[0]) and failed, now this is working, maybe I had a typo ...
0
 
LVL 37

Expert Comment

by:Geert Gruwez
ID: 24362119
it's more flexible for multidim arrays (and yes, ... slower too)
i just suggested a option
0
 
LVL 8

Author Comment

by:BdLm
ID: 24362153

Ps:  for adding elements at the beginng at at the end ->


http://www.experts-exchange.com/Programming/Languages/Pascal/Delphi/Q_21467468.htm



may be It would better to use a TList  :-( after coding many lines .....
0
 
LVL 37

Expert Comment

by:Geert Gruwez
ID: 24362168
i guess that would be with l at the end
http://www.experts-exchange.com/Q_21467468.html
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
Hi friends,  in this video  I'll show you how new windows 10 user can learn the using of windows 10. Thank you.

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now