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# 35. `isopar` — Isoparametric transformations

`Classes defined in module isopar`

class `isopar.``Isopar`(eltype, coords, oldcoords)

  A class representing an isoparametric transformation

  > type is one of the keys in Isopar.isodata coords and oldcoords can be either arrays, Coords or Formex instances, but should be of equal shape, and match the number of atoms in the specified transformation type

  The following three formulations are equivalent

      trf = Isopar(eltype,coords,oldcoords)
      G = F.isopar(trf)

      trf = Isopar(eltype,coords,oldcoords)
      G = trf.transform(F)

      G = isopar(F,eltype,coords,oldcoords)

  `transform`(X)

    Apply isoparametric transform to a set of coordinates.

    Returns a Coords array with same shape as X

`Functions defined in module isopar`

`isopar.``evaluate`(atoms, x, y=0, z=0)

  Build a matrix of functions of coords.

  - atoms: a list of text strings representing a mathematical function of x, and possibly of y and z.
  - x, y, z: a list of x- (and optionally y-, z-) values at which the atoms will be evaluated. The lists should have the same length.

  Returns a matrix with nvalues rows and natoms colums.

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