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MQL5 Reference
Matrix and Vector Methods
Products
Dot

Dot

Dot

Dot product of two vectors.

double vector::Dot(
  const vector&  b      // second vector
   );

Parameters

b

[in] Vector.

Return Value

Scalar.

Note

The dot product of two matrices is the matrix product matrix::MatMul().

A simple algorithm for the scalar product of vectors in MQL5:

double VectorDot(const vector& vector_a, const vector& vector_b)
  {
   double dot=0;

   if(vector_a.Size()==vector_b.Size())
     {
      for(ulong i=0; i<vector_a.Size(); i++)
         dot+=vector_a[i]*vector_b[i];
     }

   return(dot);
  }

MQL5 example:

for(ulong i=0; i<rows; i++)
     {
      vector v1=a.Row(i);
      for(ulong j=0; j<cols; j++)
        {
         vector v2=b.Row(j);
         result[i][j]=v1.Dot(v2);
        }
     }

Python example:

import numpy as np

a = [1, 0, 0, 1]
b = [4, 1, 2, 2]
print(np.dot(a, b))

>>> 6
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