# 6.31.2. node envelope recorder command¶

recorder('EnvelopeNode', '-file', filename, '-xml', filename, '-precision', nSD=6, '-timeSeries', tsTag, '-time', '-dT', deltaT=0.0, '-closeOnWrite', '-node', *nodeTags=[], '-nodeRange', startNode, endNode, '-region', regionTag, '-dof', *dofs=[], respType)

The EnvelopeNode recorder type records the min, max and absolute max of a number of nodal response quantaties.

 filename (str) name of file to which output is sent. file output is either in xml format ('-xml' option), or textual ('-file' option) which must pre-exist. nSD (int) number of significant digits (optional) '-time' (str) using this option places domain time in first entry of each data line, default is to have time ommitted, (optional) '-closeOnWrite' (str) using this option will instruct the recorder to invoke a close on the data handler after every timestep. If this is a file it will close the file on every step and then re-open it for the next step. Note, this greatly slows the execution time, but is useful if you need to monitor the data during the analysis. (optional) deltaT (float) time interval for recording. will record when next step is deltaT greater than last recorder step. (optional, default: records at every time step) tsTag (int) the tag of a previously constructed TimeSeries, results from node at each time step are added to load factor from series (optional) nodeTags (list (int)) list of tags of nodes whose response is being recorded (optional) startNode (int) tag for start node whose response is being recorded (optional) endNode (int) tag for end node whose response is being recorded (optional) regionTag (int) a region tag; to specify all nodes in the previously defined region. (optional) dofs (list (int)) the specified dof at the nodes whose response is requested. resType (list (str)) a string indicating response required. Response types are given in table below 'disp' displacement 'vel' velocity 'accel' acceleration 'incrDisp' incremental displacement 'reaction' nodal reaction 'eigen i' eigenvector for mode i