ABAQUS Keywords Reference Manual  

*MATRIX INPUT
Read in a matrix for a part of the model.

This option can be used to input a matrix in sparse format.

Product: ABAQUS/Standard  

Type: Model data

Level: Model  

References:

Required parameter:

NAME

Set this parameter equal to a name that will be used to identify this matrix.

Optional parameters:

INPUT

Set this parameter equal to the name of the alternate input file from which the data lines are to be read. See “Input syntax rules,” Section 1.2.1 of the ABAQUS Analysis User's Manual, for the syntax of such file names. If this parameter is omitted, it is assumed that the data follow the keyword line.

SCALE FACTOR

Set this parameter equal to a nonzero real number by which all matrix entries will be multiplied. The default value is .

Data lines to define the matrix in sparse format (only nonzero terms): 

First line:

  1. Row node number.

  2. Degree of freedom number for row node.

  3. Column node number.

  4. Degree of freedom number for column node.

  5. Matrix entry.

Give data to define a symmetric matrix in lower triangular, upper triangular, or square format. For a square matrix to be symmetric, corresponding entries above and below the diagonal must have exactly the same values.

Repeat this data line as often as necessary.