fixes

lib/averages/Trima.cs

@@ -28,7 +28,6 @@ namespace QuanTAlib;
 public class Trima : AbstractBase
 {
     private readonly Convolution _convolution;
-    private readonly double[] _kernel;
 
     /// <param name="period">The number of data points used in the TRIMA calculation.</param>
     /// <exception cref="ArgumentException">Thrown when period is less than 1.</exception>
@@ -38,7 +37,7 @@ public class Trima : AbstractBase
         {
             throw new System.ArgumentException("Period must be greater than or equal to 1.", nameof(period));
         }
-        _kernel = GenerateKernel(period);
+        double[] _kernel = GenerateKernel(period);
         _convolution = new Convolution(_kernel);
         Name = "Trima";
         WarmupPeriod = period;