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Purpose
Utilities for FEM related data structures.
Syntax
... = fe_def(def,'command', ... ) ... = fe_def('command', ... )
Description
Accepted commands are
def=fe_def('SubDef',def,ind); keeps deformations associated with ind, which a vector of indices or a logical vector (for example ind=def.data(:,1)<500 can be used to select frequencies below 500). Other fields of the def structure are truncated consistently.
def=fe_def('SubDof',def,DOF) is extracts a subset of DOFs based on defined DOF or with def=fe_def('subdofind',def,ind) indices (again either values or logicals). This command is partially redundant with feutilb PlaceInDof called with def2 = feutilb('PlaceInDof',DOF,def). The main difference is the ability to add zeros (use DOF larger than def.DOF) and support sens structures.
fe_def('SubDofInd-Cell',def,ind_dof,ind_def) returns a clean cell array listing selected DOFs and responses. This is typically used to generate clean tables.
fe_def('SubCh',def,ind) is similar to SubDof but allows but supports more advanced selection for multi-dimensional curves. This command is not fully documented.
w=fe_def('DefFreq',DISK) returns frequencies defined in the info,Freq entries using Hz units.
Range commands are used to manipulate experiment (series of design points) specifications. A range is a data structure with fields
Acceptable .param field entries are
Range=fe_def('RangeGrid',par);
Range is defined by a grid of all the parameter values defined in par.
par is expected as a cell array with as many elements as parameters. Each cell can be
par can also be a matrix following the model of the visco tools parameters definition (see fevisco Range for more details).
As an illustration, following example defines a grid 6x7 of 2 parameters named length and thickness:
par={'lab "length" min 10 max 20 cur 10 scale "lin" NPoints 6',... 'lab "thickness" min 1e-3 max 2e-3 cur 0 scale "log" NPoints 7'}; Range=fe_def('RangeGrid',par);
Range=fe_def('RangeVect',par);
Simply concatenate all parameter ranges (they must have the same length).
R1=fe_def('RangeRes',R1,Range);
This command reshapes the last dimension of the result curve R1 according to the Range. For a grid DOE last dimension is split in as many dimensions as parameters. For a vector DOE, last dimension is only redefined by a cell array of labels defining each design point.