How to sum a list

[fevs7]

Hi

I was wondering whether someone could help me with something.

I have compiled 2 lists:

1. The first lists organises the data in 2 columns
2. the second list calculates 2 variables from the first list
Is there any way to sum the columns in the second list?

Doing it as follows works but it is going to take forever with larger datasets:

seqsumC1=seqRows[0].C1+seqRows[1].C1+seqRows[2].C1+seqRows[3].C1+seqRows[4].C1;

I have tried the SUM() route but get the following error message

: 'System.Collections.Generic.List<...>' does not contain a definition for 'C1' and no extension method 'C1' accepting a first argument of type 'System.Collections.Generic.List<...>' could be found (are you missing a using directive or an assembly reference?)

If someone could point me in the right direction i would be very grateful
Code:

for (int idx = 0; idx < (int)center; idx++)


dataRows.Add(new LadderRow(Close[(int)center+idx],Close[(int)center-idx]));

for (int idx = 0; idx < (int)center; idx++)


seqRows.Add(new LadderRow(dataRows[idx].C2+dataRows[idx].C1,dataRows[idx].C2-dataRows[idx].C1));

seqsumC1=SUM(seqRows.C1, (int)center)[0];

//seqsumC1=seqRows[0].C1+seqRows[1].C1+seqRows[2].C1+seqRows[3].C1+seqRows[4].C1;

[NinjaTrader_AlanP]

Hello fevs7,

Thank you for your note.

Without the full code we’re unable to test on our end.

If you’d like, could you please upload a copy of the strategy so that we can test.

To export a NinjaScript from NinjaTrader 8 do the following:
From the Control Center window select Tools -> Export -> NinjaScript...
Click Add>Select the indicator>OK>Export.
Then attach that file you saved; under My Docs>NT8>Bin>Custom>Select the downloaded .zip file.

I look forward to your reply.

[eDanny]

Best to do a loop again?

[fevs7]

If you’d like, could you please upload a copy of the strategy so that we can test.

Hi Alan

Here is the Code

Cheers

[fevs7]

Best to do a loop again?

Hi eDanny

I have considered that but cannot seem to get it to work from the examples I found online. If you have an example of a sumloop for a list in ninjatrader that would be awesome.

Best

[Sim22]

I haven't tried this in the editor so it's just rough

try this 'using.Linq' :

 
 
for (int idx = 0; idx < (int)center; idx++)
 
    dataRows.Add(new LadderRow(Close[(int)center+idx],Close[(int)center-idx]));
 
 if (dataRows.IsNullOrEmpty()) //always check for null
         return;
 
double sum0 = dataRows.Sum(x => (x.C1 + x.C2));   
 
double sum1 = dataRows.Sum(x => (x.C1 - x.C2));

You can dispel completely with the second seqRows list.

[fevs7]

try this 'using.LinQ' :

And that solves it!

It seems I was missing the "using System.Linq;" bit

Thanks for that