# Recorder CommandCommand
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To record the nodal response and response sensitivity, the most commonly
used format is:
recorder Node -file disp29.out -time -node 29 -dof 1
<-precision 16 > disp |
recorder Node -file ddm29G1.out -time -node 29 -dof 1
"sensitivity 1" |
recorder Node -file ddm29G1.out -time -node 29 -dof 1
"sensitivity 1" |
recorder Node -file ddm29G1.out -time -node 29 -dof 1
"velSensitivity 1" |
recorder Node -file ddm29G1.out -time -node 29 -dof 1
"accSensitivity 1" |
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The above ‘recorder’ commands (extended for recording response
sensitivities) save into files (with the file name defined after the
command ‘-file’) the responses and response sensitivities of the node 29
along the first degree of freedom (dof) direction. Response quantities
can be ‘disp’ (displacements), ‘vel’ (velocities) and ‘acc’
(accelerations). Response sensitivities are denoted by a string in
double quotes and containing the response quantity identifier (i.e.,
“sensitivity” for displacements, “velSensitivity” for velocities and
“accSensitivity” for accelerations) and the sensitivity parameter
specified by the parameter tag ( in this example the tag is 1).
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The command ‘-precision’ is optional, and allows users to change the
number of digits used to record into file the response and/or response
sensitivities. This command is particularly useful when the finite
difference method is used to verify/validate DDM-based FE response
sensitivities, since high accuracy in the results may be needed.
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The user may also get responses and response sensitivities directly
using the following Tcl commands:
nodeDisp 29 1 |
nodeVel 29 1 |
nodeAccel 29 1 |
sensNodeDisp 29 1 2 |
sensNodeVel 29 1 2 |
sensNodeAccel 29 1 2 |
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These commands return the responses of the node 29 along the first dof,
and their response sensitivities with respect to the parameter with tag
2