Processing 180 by 180 array of doubles

David Smith

What is the optimum way in c sharp to process or parse an 180 by 180 array of double into memory. In a nutshell someone is passing me 180by180 array from Matlab and and I need to parse into memory using c sharp. Do I really need 2-dimensional array to this? Can someone point me in the right direction of process an 180by180 array. This is the code I have below.

MULTIPLIER = (Math.PI * 2);

double azmiuthLength = (MULTIPLIER * azmiuth);

double elevationLength = (MULTIPLIER * elevation);

for (double x = 0; x < Math.PI; x += Math.PI / 180)

{

double xAxis = Math.abs(Math.sin( azmiuthLength * Math.cos(x) / azmiuthLength * Math.cos(x)));

this.antennaPattern.getRadiationArray2D()[xIndex][0] = xAxis;

int yIndex = 0;

for (double y = 0; y < Math.PI; y += Math.PI / 180)

{

double yAxis = Math.abs(Math.sin(elevationLength * Math.cos(y) / elevationLength * Math.cos(y)));

antennaPattern.getRadiationArray2D()[xIndex][yIndex] = yAxis;

yIndex++;

}

xIndex++;

}

12 Replies

Know the answer? Post it — somebody with the same question will find it here.

David Smith7y ago
LINE 1, you are adding the yAxis in red. Where are you adding the xAxis in the code. Im confused about the xAxis.
lst.myArrayData.Add(yAxis);

list.Add(lst);
Jefferson S. Motta7y ago
These lines:
lst.myArrayData.Add(yAxis);

list.Add(lst);
David Smith7y ago
this is what I currently have. maybe I am not understanding the structure completely.

I see where you are adding the yAxis to myArrayData. At what point will we add the xAxis to myArrayData list?

lst.myArrayData.Add(yAxis);
Jefferson S. Motta7y ago
I documented and make a funcition:
using System;
using System.Collections.Generic;

namespace ConsoleApp1
{

    public class ArraysX
    {
        public double myValue { get; set; }  // THIS ACT LIKE A KEY VALUE (INDEX), BUT THE LIST CAN HAVE THE SAME VALUE IN DIFFERENT POSITIONS
        public List<double> myArrayData { get; set; }  // HERE IS YOU ARRAY WITH 180 POSITIONS OF DATA
    }


    class Program
    {



        static void Main(string[] args)
        {



            var azmiuth = 1; // YOUR VALUE ???
            var elevation = 2; // YOUR VALUE ???

            var MULTIPLIER = (Math.PI * 2);
            var azmiuthLength = (MULTIPLIER * azmiuth);
            var elevationLength = (MULTIPLIER * elevation);

            var list = new List(); // STEP 1 - THIS IS THE KEY VALUE MASTER

            //var xIndex = 0;
            for (double x = 0; x < Math.PI; x += Math.PI / 180)
            {
                var lst = new ArraysX(); // STEP 2

                var xAxis = Math.Abs(Math.Sin(azmiuthLength * Math.Cos(x) / azmiuthLength * Math.Cos(x)));
                //this.antennaPattern.getRadiationArray2D()[xIndex][0] = xAxis;

                lst.myValue = xAxis;

                //var yIndex = 0;

                for (double y = 0; y < Math.PI; y += Math.PI / 180)
                {
                    var yAxis = Math.Abs(Math.Sin(elevationLength * Math.Cos(y) / elevationLength * Math.Cos(y)));

                    lst.myArrayData.Add(yAxis);
                    //antennaPattern.getRadiationArray2D()[xIndex][yIndex] = yAxis;
                    //yIndex++;
                }
                list.Add(lst);
            }


       void DoSomething()
       {

            foreach(var x in = list)
            {
                // EVERY X IS A KEY
                foreach(var y in x)
                {
                    // EVERY y IS THE VALUE
                    var y = subItem;
                    DoSomeElse(subItem);
                }
            }

       }

        }
    }
}
David Smith7y ago
I got the foreach setup. The confusing part is how you setup the data structure. Is myValue acting as Key and the list only allows for one input. What about both x and y? public class ArraysX { public double myValue { get; set; } public List myArrayData { get; set; } }
Jefferson S. Motta7y ago
May this clear your mind:
foreach(var x in = list)
{
     foreach(var y in x)
     {
// TODO WHATELSE WITH x and y
     }
}
David Smith7y ago
I see the array class. How do i capture the x and y value. I only see you saving the y value in the array class.
Jefferson S. Motta7y ago
Look the code I previously posted. It's in Class and List.

Best,

Jeff
David Smith7y ago
Jeff can you take my example and convert to list. I am visual person. Im trying to visualize what you talking about if all possible
Jefferson S. Motta7y ago
Hi David,

"Can I just use a dictionary below instead of a 2-d multi array? Is this better."

it can be done if the key value will never be the same.
But dics, are slower because they need to check the added value against the key value and throw an error is it already existis.

Otherwise, work with list is easier to work.

"Elevation needs to be 2, and azmuith needs to be 1. Will the list process slower of i change it to 2??"
NO. Any programming language is very fast with calcs.

Best,

Jeff
David Smith7y ago
Can I just use a dictionary below instead of a 2-d multi array? Is this better.

for (double x = 0; (x < Math.PI); x = (x + (Math.PI / 180))) {
double xAxis = getXAxis(x, azmiuthLength);
antennaPattern.setAntennaPatternList(new ArrayList());
antennaPattern.setAntennaPatternId(xAxis);
for (double y = 0; (y < Math.PI); y = (y
+ (Math.PI / 180))) {
double yAxis = getYAxis(y, elevationLength);
antennaPattern.getAntennaPatternList().add(yAxis);
}
antennaPattern.AntennaPatternDictionary().add(antennaPattern.getAntennaPatternId(), antennaPattern.getAntennaPatternList());
}
David Smith7y ago
Elevation needs to be 2, and azmuith needs to be 1. Will the list process slower of i change it to 2??