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Coordinate transformation matrices for Component Mode Synthesis problems.


[t] = fe_coor(cp)
[t,nc] = fe_coor(cp,opt)


The different uses of fe_coor are selected by the use of options given in the argument opt which contains [type method] (with the default values [1 3]).

type=1(default) the output t is a basis for the kernel of the constraints cp

NCNS is the number of independent constraints.

type=2the output argument t gives a basis of vectors linked to unit outputs followed by a basis for the kernel

If NC<NS such a matrix cannot be constructed and an error occurs.

methodthe kernel can be computed using: 1 a singular value decomposition svd (default) or 3 a lu decomposition. The lu has lowest computational cost. The svd is most robust to numerical conditioning problems.


fe_coor is used to solve problems of the general form


which are often found in CMS problems (see section 6.2.6 and [47]).

To eliminate the constraint, one determines a basis T for the kernel of [cint] and projects the model


See also

Section 7.14, fe_c, the d_cms demo

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