On managing different types of array

[baba123]

I would like some explanation on manipulating different types of array.Let's take an example :

Assume I have 3 arrays : int[] array1 = new int{0,0,0}
int[] array2 = new int{0,0,0}
double[] array3 = new double{0,0,0}


I want to do a simple operation, something like "array3=array1/array2"

When I use the following snippet :

for (i=0;i<array1.length;i++) {array3[i]=array1[i]/array2[i];}

...It always returns 0 values. My best guess is that I must convert array1/array2 into a double before assigning it to array3 but I am not sure of that.

Using the "AssignTo" method might be more straightforward but I am not very familiar with it. Could you give me the best method to do these kind of operations with different types of arrays ?

[NinjaTrader_Brett]

Hello,

Thanks for the note.

This is more of a C# general question then a NinjaScript question. I have not dealt too much with arrays myself however the only issue I see here unless I'm missing this section of code is that all arrays currently hold 0. 0/0 would yield exception or 0.

Would also recommend adding Print statments to print the variables state to see whats going on.

Print();

Let me know if I can be of further assistance.

[baba123]

to be more precise I filled array1 and array2 with non-zero values but when I try to do array3=array1/array2 and Print(array3[0]) for example it always returns 0. Why ?

It seems like dividing integer value by another integer value returns zero if the result is not an integer. Am I clear ?

[NinjaTrader_Brett]

Hello,

Not sure on this one sorry and no real pointers I could provide either. I would expect it to work not sure why it would not work. Might suggest using a resource such asa MSDN or a c# code tutorial site to see if your missing something on use of your array. it looks good from here. If I was facing the problem this would be my first step, after I added Prints() to make sure that Array[1] and Array[2] held values.

Let me know if I can be of further assistance.

[baba123]

Seems like I am doomed :-(

I already searched the MSDN database but did not find anything. I wonder if converting my int arrays into double arrays at the beginning of the code would do the trick.
I will try it now but it will be my last chance...

[NinjaTrader_Austin]

baba123, I just noticed something here. Your arrays don't match data types. Please try casting the result into a double before setting it.

array3[i] = (double) array2[i]/ (double) array1[i]
// or
array3[i] = double.Parse(array2[i]/array1[i]);

EDIT: You just noticed this too. Hopefully it works. If not, try putting the math stuff into a try catch block and see if it spits out a more useful error.

[baba123]

I already tried this but it did not work. Now I am trying to rebuild the code using only double arrays but I have a problem or rather an interrogation :

When I write :

if (CurrentBar<1)
return;
else
{
double compte = (double) Math.Sign(Close[0]-Close[1]);
Value1.Set(compte);
Print(Value1[0]);
}


in the output window I only get integer values (-1,0,1). Basically I try to put sum from a to b (Value1[0]) in those array1 and array2 defined earlier if some conditions are met. a and b are dependant of those conditions too.
At first I defined them as integer arrays since they only contained sum of 0,1,-1 values (integer values).

But somewhere in the script i need to divide array1 by array2 and that is when things get nasty. The results of this operation is clearly a double but I only get 0 in the output window no matter what I try. Clearly frustrating !

I will define array1 and array2 as double array and see if this works but even converting Math.Sign values into double stil returns integer value I am afraid I might run into another problem....

[NinjaTrader_Austin]

baba123, the Math.Sign() function is working as expected. It only returns values of -1, 0, or 1, indicating negative, zero, and positive values.

If the values you're working with are directly related to bar vales, perhaps you should be working with a DataSeries instead, which is basically an array, but tied to bars.

Here is a sample that shows how to store calculations in a DataSeries - http://www.ninjatrader.com/support/f...ead.php?t=7299.

[baba123]

I finally get it to work. The solution was to convert all integer variables into double ones in order to work with only 1 type of array.

Thank you for your help.