3.3.2. printA

printA <-file $fileName> <-m $m> <-c $c> <-k $k>

$fileName	string	file name to write tangent to.
$m	float	factor with which to scale the inertial part of the tangent (OpenSeesRT only).
$c	float	factor with which to scale the damped part of the tangent (OpenSeesRT only).
$k	float	factor with which to scale the static part of the tangent (OpenSeesRT only).

Print the contents of the matrix that the integrator creates to the screen or a file if the -file option is used. If using a static integrator, the resulting matrix is the stiffness matrix. If a transient integrator, it will be some combination of mass and stiffness matrices.

Note

The full version of this command as documented above is supported from Python and Tcl through OpenSeesRT. In OpenSeesPy and older Tcl versions this command only works with the FullGeneral linear system, and the GimmeMCK integrator must be used to specify m c and k factors.

3.3.2.1. Examples

The following examples will return a matrix \(\mathbf{A}\) that is given by a linear combination of the mass \(\mathbf{M}\) and stiffness \(\mathbf{K}\):

\[\mathbf{A} = \frac{1}{2}\mathbf{M} + \frac{1}{10}\mathbf{K}\]

In Tcl:

printA -m 0.5 -k 0.1

and in Python with OpenSeesRT:

A = model.getTangent(m=0.5, k=0.1)