inv3x3.h File Reference

Macro for 3x3 matrix inverse. More...

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Detailed Description

Macro for 3x3 matrix inverse.

Author

Pascal Getreuer getre.nosp@m.uer@.nosp@m.gmail.nosp@m..com

Computes 3x3 matrix inverse as a macro using Cramer's rule. If the matrix elements are constant, this macro should allow the inverse to be determined at compile time.

A convenient way to use these macros is to define a macro that evaluates a function with your matrix as the arguments, then call it repeatedly to construct the inverse matrix.

#define _MYMAT(A)     A(12.5, -3.3, 0.1, \
                         0.1, 32.1, 0.0, \
                         0.0,  0.0, 5.1)

#define INVMYMAT_11   _MYMAT(INV3X3_11)
#define INVMYMAT_12   _MYMAT(INV3X3_12)
#define INVMYMAT_13   _MYMAT(INV3X3_13)

#define INVMYMAT_21   _MYMAT(INV3X3_21)
#define INVMYMAT_22   _MYMAT(INV3X3_22)
#define INVMYMAT_23   _MYMAT(INV3X3_23)

#define INVMYMAT_31   _MYMAT(INV3X3_31)
#define INVMYMAT_32   _MYMAT(INV3X3_32)
#define INVMYMAT_33   _MYMAT(INV3X3_33)

Definition in file inv3x3.h.