Arrays in NT

[GKonheiser]

Sorry for such a basic question but how do I assign values to an an array?

Array[7] = {1,2,3,4,5,6,7}; // ?

[NinjaTrader_CalH]

GKonheiser,

Array.IList.Add()

http://msdn.microsoft.com/en-us/libr...v=vs.110).aspx

[koganam]

GKonheiser,

Array.IList.Add()

http://msdn.microsoft.com/en-us/libr...v=vs.110).aspx

That always throws an exception.

[koganam]

Sorry for such a basic question but how do I assign values to an an array?

Array[7] = {1,2,3,4,5,6,7}; // ?

Your question, given the example that you show is unclear. Are you asking how to declare an Array?

[GKonheiser]

I have an array,

double[] levels = new double[7] {w1,w2,w3,w4,w5,w6,w7};

What I'm trying to do is search the array and find the next highest and lowest number to Close[0] but I cant get the syntax correct, I have:-

hLevel = Array.Find(levels, x > Close[0]);
lLevel = Array.Find(levels, x < Close[0]);

could you tell me what the correct syntax is for this?

[NinjaTrader_CalH]

GKonheiser,

Take a look at the link below, it should shed more light on the subject -
http://www.dotnetperls.com/array-find

[koganam]

I have an array,

double[] levels = new double[7] {w1,w2,w3,w4,w5,w6,w7};

What I'm trying to do is search the array and find the next highest and lowest number to Close[0] but I cant get the syntax correct, I have:-

hLevel = Array.Find(levels, x > Close[0]);
lLevel = Array.Find(levels, x < Close[0]);

could you tell me what the correct syntax is for this?

One way would be to sort the array, then loop through it to find the values that span Close[0] value where you seek.

[GKonheiser]

Ive now got the array declared but when i try to get the value in the array they come back as null even thou I have populated the array,

this is the code i have so far:-

if(BarsInProgress == dBIP) // Day Bars
{
// Calculate Pivot Points(for order Entery)

pp = Math.Round((Highs[dBIP][0] + Lows[dBIP][0] + Closes[dBIP][0])/3,2);
r1 = Math.Round((2 * pp) - Lows[dBIP][0],2);
s1 = Math.Round((2 * pp) - Highs[dBIP][0],2);
r2 = Math.Round(pp + (Highs[dBIP][0] - Lows[dBIP][0]),2);
s2 = Math.Round(pp - (Highs[dBIP][0] - Lows[dBIP][0]),2);
r3 = Math.Round(r1 + (Highs[dBIP][0] - Lows[dBIP][0]),2);
s3 = Math.Round(s1 - (Highs[dBIP][0] - Lows[dBIP][0]),2);

double[] pivots = new double[7] {r3, r2, r1, pp, s1, s2, s3};

Array.Sort (pivots);


}

if(BarsInProgress == mBIP)
{
int h = Array.BinarySearch(pivots, Close[mBIP]);

if( pivots[0] != 0 || pivots[1] != 0 || pivots[2] != 0 || pivots[3] != 0 || pivots[4] != 0 || pivots[5] != 0 || pivots[6] != 0 )
{
hPiv = pivots[h+1];
lPiv = pivots[h-1];
}

[NinjaTrader_Lance]

it looks like pivots is not defined in the same scope when you reference it.

Consider defining it outside of the if statement or outside of OnBarUpdate()

[GKonheiser]

I need to define the array in OnBarUpdate in Daily bars as I am calculating levels on a daily basis and then using the array on a minute time frame?

[NinjaTrader_Lance]

As there are parts of your code missing I can't say for sure but at first glance I saw

double[] pivots = new double[7] {r3, r2, r1, pp, s1, s2, s3};

was defined inside of one if statement

In the later if statement you check pivots[0] != 0

These won't be referring to each other if that is what you're trying to do. Sorry if I misunderstand.

[koganam]

I need to define the array in OnBarUpdate in Daily bars as I am calculating levels on a daily basis and then using the array on a minute time frame?

No you do not. Define it as a class variable and populate it in OBU. Your problem is coming from a scope limitation.

Also, by the very way that you have defined the pivots array, it is already sorted from high to low, so you do not need to run a sort routine in this particular case.

[GKonheiser]

Got it, understand what i was doing wrong, Thanks

[GKonheiser]

Error comparing doubles

Hi

So I have defined and populated my array with doubles (pivot points). I am then using:

i = Array.BinarySearch(pivots, Closes[mBIP]);

to compare Closes to the array but I get an error "**NT** Error on calling 'OnBarUpdate' method for strategy 'PivShortCode/b11fc6d627cb43aaab280f46194ae269': Failed to compare two elements in the array."

When i debug this in VStudio, and look at the error its telling me {"Object must be of type Double."}??

Both Closes[mBIP] and all elements in pivots are doubles.

can anyone shed light on why this is, do I need to convert Closes in some way?

[koganam]

Hi

So I have defined and populated my array with doubles (pivot points). I am then using:

i = Array.BinarySearch(pivots, Closes[mBIP]);

to compare Closes to the array but I get an error "**NT** Error on calling 'OnBarUpdate' method for strategy 'PivShortCode/b11fc6d627cb43aaab280f46194ae269': Failed to compare two elements in the array."

When i debug this in VStudio, and look at the error its telling me {"Object must be of type Double."}??

Both Closes[mBIP] and all elements in pivots are doubles.

can anyone shed light on why this is, do I need to convert Closes in some way?

What type is "i" ?