MATR

Explicit matrix input from a text file, in the format written by the print_matrix command.

Parameter Name	Units	Type	Default	Description
L	$M$	double	0.0	length
FILENAME		STRING		input file
ORDER		long	1	matrix order

The input file for this element uses a simple text format. It is identical to the output in the printout file generated by the tt matrix_output command. For example, for a 1st-order matrix, the file would have the following appearance:
description: C1 C2 C3 C4 C5 C6
R1: R11 R12 R13 R14 R15 R16
R2: R21 R22 R23 R24 R25 R26
R3: R31 R32 R33 R34 R35 R36
R4: R41 R42 R43 R44 R45 R46
R5: R51 R52 R53 R54 R55 R56
R6: R61 R62 R63 R64 R65 R66

Items in normal type must be entered exactly as shown, whereas those in italics must be provided by the user. The colons are important! For this particular example, one would set ORDER=1 in the MATR definition. In general, the Ci are zero, except for C5, which is usually equal to the length of the element (which must be specified with the L parameter in the MATR definition).