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Announce nap 3.1.0

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  • Harvey.Davies@csiro.au
    NAP (N-Dimensional Array Processor)is a loadable extension of Tcl that provides a convenient, powerful and efficient facility for processing data in the form
    Message 1 of 1 , May 1, 2003
      NAP (N-Dimensional Array Processor)is a loadable extension
      of Tcl that provides a convenient, powerful and efficient
      facility for processing data in the form of n-dimensional
      arrays. NAP provides the essence of array-processing
      languages such as APL, J, IDL and Matlab.

      Special facilities are provided for data based on
      n-dimensional grids, where the dimensions correspond to
      continuous spatial coordinates and values are defined using
      multidimensional linear interpolation. There are interfaces
      to the HDF and netCDF file formats commonly used for such
      data, especially in Earth sciences such as oceanography and

      A revised version of my talk on NAP at the 9th Annual
      Tcl/Tk Conference, 2002 is at

      The main documentation of NAP is at

      The NAP home page is
      This contains a link labelled 'Files for downloading',
      which can be used to access both source and binary files.

      Nap version 3.1.0 is compatible with Tcl 8.4 and BLT 2.4z.
      Compatibilty issues (related to BLT) are discussed further in

      The following details changes since the previous version (3.0.5):

      The 'laminate' ('///') operator now produces a different (more sensible)
      result if the ranks of the operands differ. The rank of the result is now
      one greater than the greater of the operand ranks. Laminate ('//') now
      handles any lower rank operand by reshaping it to the shape of the other
      operand. Some bugs in laminate & catenate ('//') have been fixed.

      Function 'invert_grid' now handles any missing values (not just NaN) and
      only overwrites interpolated values if the new value is based on a smaller
      rectangle than the old one.

      Function 'psum': Bug fixed.

      The 'tally' (unary '#') operator now allows a boxed argument, which produces
      an n-dimensional contingency (cross-classification) table containing joint

      The cast functions (e.g. 'f32', 'i8') no longer create a new NAO if the
      argument already has the required data-type.

      Constants can now have a '+' sign.

      Octal constants are no longer supported. Thus '012' is now treated as 12
      rather then 10. Octal constants were seldom if ever used and were
      incompatible with much existing data.

      Floating-point constants can now end with 'p' or 'e'. The missing exponent
      defaults to 1. So '1p' is equivalent to '1p1' (which represents 'pi').

      Byte-swapping is now supported by the command 'nap_get', the new OOC method
      'swap' & various library procedures.

      Several hdf/netcdf bugs have been fixed. The 'hdf' and 'netcdf'
      sub-commands of 'nap_get' now provide an option for 'raw' input in which
      the attributes scale_factor, add_offset, valid_min, valid_max & valid_range
      are ignored.

      The HTML documentation has been revised and most pages now have a table of

      Library: New functions magnify_nearest, magnify_interp, magnify_generic,
      area_on_globe. Extensive improvements to plot_nao.

      Harvey Davies, CSIRO Atmospheric Research,
      Private Bag No. 1, Aspendale 3195
      E-mail: harvey.davies@...
      Phone: +61 3 9239 4556
      Fax: +61 3 9239 4444

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