[gnuastro-devel] [task #15109] Size of dataset as an Arithmetic operator

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/task/?15109>

                 Summary: Size of dataset as an Arithmetic operator
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Sat 08 Dec 2018 05:11:07 PM CET
         Should Start On: Sat 08 Dec 2018 12:00:00 AM CET
   Should be Finished on: Sat 08 Dec 2018 12:00:00 AM CET
                Category: Arithmetic
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: Postponed
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

In some processing situations, the size of a dataset along a dimension is
necessary. So Arithmetic can use a new operator, maybe called "size" that will
do this job. For example the command below will print the size of the dataset
along its second dimension.


$ astarithmetic image.fits 2 size


The only thing I am thinking about is that an operator like this (and maybe
others like some future ones on printing the type) only need the dataset's
meta-data and don't actually need the dataset's contents! So to be most
efficient (especially on large datasets), we should implement a mechanism that
if reading from a file, we don't need to actually load the contents and if
reading from the stack (dataset already in memory, output of previous
operator), we don't make a full copy.




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