﻿ Measures.Mean Method (Double[][], Int32)

Calculates the matrix Mean vector.

Namespace:  Accord.Statistics
Assembly:  Accord.Math (in Accord.Math.dll) Version: 3.8.0
Syntax
```public static double[] Mean(
this double[][] matrix,
int dimension
)```

#### Parameters

matrix
Type: SystemDouble
A matrix whose means will be calculated.
dimension
Type: SystemInt32
The dimension along which the means will be calculated. Pass 0 to compute a row vector containing the mean of each column, or 1 to compute a column vector containing the mean of each row. Default value is 0.

#### Return Value

Type: Double
Returns a vector containing the means of the given matrix.

#### Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type . When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
Examples
```double[][] matrix =
{
new double[] { 2, -1.0, 5 },
new double[] { 7,  0.5, 9 },
};

// column means are equal to (4.5, -0.25, 7.0)
double[] colMeans = Stats.Mean(matrix, 0);

// row means are equal to (2.0, 5.5)
double[] rowMeans = Stats.Mean(matrix, 1);```