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Matrix Type

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A matrix is a special data type that contains between one and sixteen components. Every component of a matrix must be of the same type.
TypeComponents Name

Components

Item Description
TypeComponents
 A single name that contains three parts. The first part is one of the scalar types. The second part is the number of rows. The third part is the number of columns. The number of rows and columns is a positive integer between 1 and 4 inclusive.
Name
 An ASCII string that uniquely identifies the variable name.

Examples

Here are some examples:

int1x1    iMatrix;   // integer matrix with 1 row,  1 column
int4x1    iMatrix;   // integer matrix with 4 rows, 1 column
int1x4    iMatrix;   // integer matrix with 1 row, 4 columns
double3x3 dMatrix;   // double matrix with 3 rows, 3 columns

float2x2 fMatrix = { 0.0f, 0.1, // row 1
                     2.1f, 2.2f // row 2
                   };

A matrix can be declared using this syntax also:

matrix <Type, Number> VariableName

The matrix type uses the angle brackets to specify the type, the number of rows, and the number of columns. This example creates a floating-point matrix, with two rows and two columns. Any of the scalar data types can be used.

Here is an example:

matrix <float, 2, 2> fMatrix = { 0.0f, 0.1, // row 1
                                 2.1f, 2.2f // row 2
                               };

See also

Data Types (DirectX HLSL)