Implementation notice:

14.1 Implementation notice:

First element of a matrix has index (0,0), first element of a vector has index (0).

The vector is one-column-matrix, not separate object. One-row-matrix is called a row vector, but that object should not be used as vector in REXYGEN.

The matrix inputs and outputs are references. It means one block (the MX_MAT block or the MX_VEC block most often) reserve memory for the matrix and other block (using same reference) write/read same space. The MB_DCOPY block (and second the MX_MAT block) must be used to create copy of the matrix.

Some blocks using vector (MB_DCPY, RTOV, VTOR) not check exact dimensions (for example a 10x10 matrix is regard as 100-elements vector). Matrix is linearize into vector column by column, because a matrix is stored this way in memory (e.g. for a 10x10 matrix: element (1,0) has index 1 in vector, element (2,0) has index 2 in vector, element (0,1) has index 10 in vector, element (0,2) has index 11 in vector, etc.) These type of blocks could not be used with submatrix returned by the MX_DSAREF block. Behavior is undefined in this case.

The most matrix blocks has input and output matrix reference. Both are equal, but connecting input reference to output reference of previous block define execution order (the blocks are executed according signal flow in REXYGEN) and therefore computed matrix equation.

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