Array problem

[kuroro13]

Can someone tell what is the problem with this loop :


double[] X = newdouble[257];
double[] Y = newdouble[257];
for (int iBar=0;iBar<nBars;iBar++)
{
X(iBar)=iBar;
Y(iBar)= (MAX(High,nBars-iBars)[0]+MIN(Low,nBars-iBars)[0])/2;
}

I don't understand the error message :
"X is an "array" but is used like a "method" "

[NinjaTrader_Ray]

try

X[iBar] = iBar;

[] is used for accessing items in a collection, () is used for methods.

[kuroro13]

ok

and how do you code "^" in C# ?
ex :
W[iBar]=W[iBar]+Avect[jCoef]*iBar^(jCoef-1);

I also have a problem with absolute value.
Is it Abs()?

[NinjaTrader_Ray]

I don't know what "^" means? If you can tell me that, maybe I can help.

Check out the .NET Math class.

Math.Abs(value) etc...

[kuroro13]

when I use ^ in the previous statement I have the following error message :

^ operator cannot be applied to operands of type int or double

[NinjaTrader_Ray]

right, its not valid. What I am saying is that I don't know what "^" is supposed to do.

For example:

* = multiply
/ = divide
^ = ???

[kuroro13]

I give you an example:

a^2=a*a;
a^n=a*a*a....*a (n times)

[NinjaTrader_Dierk]

- please consult the MS docs to properly understand the C# operators
- you likely are looking for the Math.Pow() function. Please consult the MS docs for details

[thrunner]

msdn is where you look for generic dot net C# methods documentation.

The methods of the Math class are listed here:

http://msdn.microsoft.com/en-us/library/system.math_methods(vs.71).aspx

As NTDierk pointed out, the number raised to a power method is probably what you want:

http://msdn.microsoft.com/en-us/library/system.math.pow(VS.71).aspx

[kuroro13]

thank you for your help. I think I'm starting to understand C# a little bit more thanks to you.
I finally succeed in coding my indicator.
compilation is ok but when I try to use my indicator I got the following error message :

Error on calling the OnBarUpdatemethod() method for indicator 'BAMcenter' on bar 100 : index is out of array's bound.

I already use a code to ensure there would be no problem with index and I can't find the problem.
Here is the script :

[NinjaTrader_Ray]

It means on the 100th bar from left to right you are accessing an array where the index value passed in is greater than the number of elements in the array.

Here is something that may be of value - http://www.ninjatrader-support.com/v...ead.php?t=3170

[kuroro13]

I already use these kind of loop to ensure there would be no problems with index. I think the problem lies elsewhere.
Indeed, I just tried to translate a free public VBA code published by a french trader.
I followed every step concensciously but I didn't understand the end of the code :

For iBar=0 to nBars-1
W(iBar)=0;
For jCoef=1 to Degree+1
W(iBar)=W(iBar)+Avect(jCoef)*iBar^(jCoef-1)
Next jCoef
.SetIndicatorValue W(iBar),1,(nBars-1-iBar)
.SetIndicatorValue W(iBar)*smthg,2,(nBars-1-iBar)
Next iBar

I underlined the part of the code I did not understand and could not translate.
the numbers 1 and 2 are probably used for the plotting but the (nBars-1-iBars) does not make any sense to me.

[NinjaTrader_JoshP]

kuroro13,

We are not experts on VBA, but you would need to recheck your loop since you are running into the index out of bound issue.