Linear Algorithm: Difference between revisions
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| style="background: | | style="background:lightgreen; color:black; width:800px" | '''algorithm Linear <-initial> <-factorOnce>''' | ||
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| '''-initial''' || optional flag to indicate to use initial stiffness | | '''-initial''' || optional flag to indicate to use initial stiffness | ||
|- | |||
| '''-factorOnce''' || optional flag to indicate to only set up and factor matrix once | |||
|} | |} | ||
---- | |||
NOTES | |||
1) as the tangent matrix typically will not change during the analysis in case of an elastic system it is highly advantageous | |||
to use the -factorOnce option. Do not use this option if you have a nonlinear system and you want the tangent used to be actual tangent at time of the analysis step. | |||
---- | ---- | ||
Code Developed by: <span style="color:blue"> fmk </span> | Code Developed by: <span style="color:blue"> fmk </span> | ||
Latest revision as of 07:53, 9 June 2016
- Command_Manual
- Tcl Commands
- Modeling_Commands
- model
- uniaxialMaterial
- ndMaterial
- frictionModel
- section
- geometricTransf
- element
- node
- sp commands
- mp commands
- timeSeries
- pattern
- mass
- block commands
- region
- rayleigh
- Analysis Commands
- Output Commands
- Misc Commands
- DataBase Commands
This command is used to construct a Linear algorithm object which takes one iteration to solve the system of equations.
- <math> \Delta U = - K^{-1}R(U),\!</math>
| algorithm Linear <-initial> <-factorOnce> |
| -secant | optional flag to indicate to use secant stiffness |
| -initial | optional flag to indicate to use initial stiffness |
| -factorOnce | optional flag to indicate to only set up and factor matrix once |
NOTES 1) as the tangent matrix typically will not change during the analysis in case of an elastic system it is highly advantageous to use the -factorOnce option. Do not use this option if you have a nonlinear system and you want the tangent used to be actual tangent at time of the analysis step.
Code Developed by: fmk