Array values on ArraySetAsSeries

[mcronline]

Hi

I have set a double array with the AS_SERIES flag using the ArraySetAsSeries function, but when I add a new value to array[0] the older values does not distribute to the other indexes, in fact it apears a loong number. See below the first 4 indexes

[0] 3315.0 (this is right)

[1] 9.881312916824931e-324

[2] 9.881312916824931e-324

[3] 9.881312916824931e-324

am I doing something wrong?

It is a dynamic array, and I'm using the ArrayResize function to add one index before througing any new values.

Thank you

[Alain Verleyen]

Show your code if you need coding help.

[nicholish en]

mcronline:

Hi

I have set a double array with the AS_SERIES flag using the ArraySetAsSeries function, but when I add a new value to array[0] the older values does not distribute to the other indexes, in fact it apears a loong number. See below the first 4 indexes

[0] 3315.0 (this is right)

[1] 9.881312916824931e-324

[2] 9.881312916824931e-324

[3] 9.881312916824931e-324

am I doing something wrong?

It is a dynamic array, and I'm using the ArrayResize function to add one index before througing any new values.

Thank you

If you need to append an array with a new value, then that element always goes to the end. You might find it much easier to use the std lib array class instead where you can insert an element at a specified index and the remainder of the array adjusts to accommodate the new element. 

#include <Arrays\ArrayDouble.mqh>
void OnStart()
{
   double test_numbers[] = {1.,2.,3.,4.,5.};
   CArrayDouble array;
   array.AssignArray(test_numbers);
   array.Insert(0., 0);
   
   for(int i=0;i<array.Total();i++)
      printf("%f",array[i]);
}

https://www.mql5.com/en/docs/standardlibrary/datastructures/carraydouble

[mcronline]

Alain Verleyen:
Show your code if you need coding help.

renko_close[0] holds a tick price

double tops[];

ArrayResize(tops,2);

ArraySetAsSeries(tops,true);

tops[0] = 0;
tops[1] = 0;

ArrayResize(tops,ArraySize(tops) + 1);
tops[0] = renko_close[0]

[nicholish en]

mcronline:

Like I mentioned the new element is going to always be at the end. So either you need to manually shift your entire array or use the CArrayDouble with CArrayDouble::Insert method.

...or even better just add your new value to the end of the array and loop backward instead.

[mcronline]

nicholishen:

Like I mentioned the new element is going to always be at the end. So either you need to manually shift your entire array or use the CArrayDouble with CArrayDouble::Insert method.

Thats not what this doc says

https://www.mql5.com/en/articles/567

Look for Array Indexing Order. It shows this example

double ar[]; // Array
ArrayResize(ar,2); // Prepare the array
ar[0]=1; // Set the values
ar[1]=2; 
ArraySetAsSeries(ar,true); // Change the indexing order
ArrayResize(ar,3); // Increase the array size
ar[0]=3; // Set the value for the new array element
Alert(ar[0]," ",ar[1]," ",ar[2]); // Print array values

"After the execution of this code, the values contained in the array should be 3, 2 and 1."

[William Roeder]

mcronline: hen I add a new value to array[0] the older values does not distribute to the other indexe

Indicators have buffers which automatically shift. Arrays do not automatically do anything. You must do it in EA.
          Array indexing and resizing an AS_SERIES array - Indexes - MQL4 and MetaTrader 4 - MQL4 programming forum

[Tobias Johannes Zimmer]

nicholish en #:

If you need to append an array with a new value, then that element always goes to the end. You might find it much easier to use the std lib array class instead where you can insert an element at a specified index and the remainder of the array adjusts to accommodate the new element. 

https://www.mql5.com/en/docs/standardlibrary/datastructures/carraydouble

mcronline #:

Thats not what this doc says

https://www.mql5.com/en/articles/567

Look for Array Indexing Order. It shows this example

"After the execution of this code, the values contained in the array should be 3, 2 and 1."

You are talking about apples and oranges. Also the code is flawed, have you tried it yourself? Because it does not do what was advertised. Ask yourself what you would have to add so that the values would shift as you want.

A tip, you can shift the values manually but when you know what you are doing you will automate it with a loop.

Other than that the article is very useful for beginners. Everybody makes mistakes. Comment to the author, I am sure he will check and correct it.