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length of a multi dim array

Posted on 2009-05-11
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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;

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Question by:BdLm
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7 Comments
 
LVL 26

Accepted Solution

by:
Russell Libby earned 1800 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

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LVL 38

Assisted Solution

by:Geert Gruwez
Geert Gruwez earned 200 total points
ID: 24358301
why not use a Variant ?
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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.
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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 ...
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LVL 38

Expert Comment

by:Geert Gruwez
ID: 24362119
it's more flexible for multidim arrays (and yes, ... slower too)
i just suggested a option
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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 .....
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LVL 38

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
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