array_copy

BD. · Postby **BD.** » 08 Feb 2024

How does array_copy work? I'm trying to shift elements of an array using "array_copy" description clearly states that it should copy "beginning at the index of N"(see below) instead it copies the element of index N for a specified amount.
Issues start to appear when I enter "NumberOfElements" parameter greater than the difference between source index and dest. index.

Copies a specified number of elements from the specified one-dimensional source array, starting at the specified source index; the elements are copied to the specified one-dimensional destination array, starting at the specified destination index.

Source and destination can be the same array as well as two different arrays.

Usage
Array_Copy(SourceArray,SourceIndex,DestinationArray,DestinationIndex,NumberOfElements)

Where: SourceArray - an expression specifying the name of the source array
DestinationArray - an expression specifying the name of the destination array
SourceIndex - a numerical expression specifying the starting index for the source array
DestinationIndex - a numerical expression specifying the starting index for the destination array
NumberOfElements - a numerical expression specifying the number of elements to copy

Example
Copy from Array1 the two-element segment beginning at the index of 4, to the Array2, beginning at the index of 6:

Array_Copy(Array1,4,Array2,6,2);

Copy from Array1 the two-element segment beginning at the index of 4, to the same array, beginning at the index of 6:

Array_Copy(Array1,4,Array1,6,2);

Code: Select all

var:timewindow(false);
timewindow = d=1240119 and time >= 800 and t <= 1000;

array:
		int arrOne[10](0);
		
once (true) begin
	array_setintegervalue(arrOne,1,1);
	array_setintegervalue(arrOne,2,2);
	array_setintegervalue(arrOne,3,3);
	array_setintegervalue(arrOne,4,4);
	array_setintegervalue(arrOne,5,5);
	array_setintegervalue(arrOne,6,6);
	
	end;


//Code-->
if timewindow and value10>0 //skip first round
	then begin
			
			array_copy(arrOne,1,arrOne,2,3);
			
			print (
			
			t," COPY 1:",
			
			array_getintegervalue(arrOne,1), " 2:",array_getintegervalue(arrOne,2)," 3:",array_getintegervalue(arrOne,3)
			," 4:",array_getintegervalue(arrOne,4)," 5:",array_getintegervalue(arrOne,5)," 6:",array_getintegervalue(arrOne,6)
			
			);
	end;

if timewindow
	then begin
			value10+=1; //Counter
			array_setintegervalue(arrOne,1,value10);
			print( t," new val: ", array_getintegervalue(arrOne,1) );
	end;
//<--

//Log
if timewindow
	then begin
			print (
			
			t,"   1:",
			
			array_getintegervalue(arrOne,1), " 2:",array_getintegervalue(arrOne,2)," 3:",array_getintegervalue(arrOne,3),
			" 4:",array_getintegervalue(arrOne,4)," 5:",array_getintegervalue(arrOne,5)," 6:",array_getintegervalue(arrOne,6)
			
			);
	end;

Kate MultiCharts · Postby **Kate MultiCharts** » 08 Feb 2024

Hello,

When an array is being copied into itself (array_copy(arrOne,1,arrOne,2,3);), the array overwrites its elements with its first element.

Code: Select all

array: int arrOne[10](0);
		
once (true) 
begin
	array_setintegervalue(arrOne,1,1);
	array_setintegervalue(arrOne,2,2);
	array_setintegervalue(arrOne,3,3);
	array_setintegervalue(arrOne,4,4);
	array_setintegervalue(arrOne,5,5);
	array_setintegervalue(arrOne,6,6);
end;

if LastBarOnChart then
begin
	once 
	begin	
	array_copy(arrOne,1,arrOne,2,3);
			
			
	for value1 = 1 to 6
	begin			
		print(value1, " ", arrOne[value1]);
	end;
	end;
end;

Output

Code: Select all

1.00    1.00
2.00    1.00
3.00    1.00
4.00    1.00
5.00    5.00
6.00    6.00

BD. · Postby **BD.** » 14 Feb 2024

You're right. It does actually work when array_copy(arrOne,1,arrOne,5,4); source Index doesn't overlap destination Index.

Code: Select all

   1.00    1.00
   2.00    2.00
   3.00    3.00
   4.00    4.00
   5.00    1.00
   6.00    2.00
   7.00    3.00
   8.00    4.00
   9.00    9.00

array_copy

array_copy

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Re: array_copy