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Objectives:

  • GET: To retrieve subset of data elements
  • GET_SIZE: To interrogate the size of subset of data elements,

 

Assumptions:

  • GET_SLICE type methods are not in the scope of the task (they are alternative ways to retrieve parts of the data elements) – although may be useful to add (independently of the deliverable) if straightforward to implement.
  • Implementation in Python only, no plans for other languages

Functionality:

  • A simple structure or a leaf with no more than one array of structure ancestor, 
    • Returned: an array of the field i, containing the desired indices of its parent array of structure (optional argument, valid only if the requested leaf has the same size for all desired indices).
    • Example : magnetics.flux_loop(indices).flux
    • Q: how can we specify this with Bartek’s method ? Does a Python method accept a syntax such as magnetics.flux_loop(:).flux.get or magnetics.flux_loop.flux.get(:) ? 
  • An array of structure
    • Returned: an array of structure containing the desired indices (optional argument, by default all indices are returned).
    • Example : magnetics.flux_loop(indices) à straightforward with Bartek’s method
  • An array of structure with an array of structure ancestor:
    • Example. ic_antennas.antenna(indices1).module.get(indices2)
    •  It will be investigated if the method can be also easily implemented (i.e. the result is not guaranteed and the need is less obvious)
  • A field or a simple structure with more than one array of structure ancestor
    • Example: ic_antennas.antenna(indices1).module(indices2).power_launched.get
    •  It will be investigated if the method can be also easily implemented (i.e. the result is not guaranteed and the need is less obvious)

Syntax:

 

Syntax used by of DEMUX actor

..... first you have to add a ; (semicolon) after the name of the field, then you have to specify the dimension in which you consider the data (1 is the first dim). After that, you can add as many ;index as you want (a semicolon followed by an index you want to extract). You can also replace the index by an expression index1:index2 (with a colon) to specify a set of indexes between both index1 and index2. For example, position/z;1;5;10;15:18 will export indexes [5,10,15,16,17,18] of the field z.

 

  • ids_get(<path_including_indices>)
    • input parameters
      • pulseCtx (OR shot, run, user, tokamak, version)
      • IDS name
      • occurence
      • QUERY
    • output parameters
      • array of primitive types (if query points to field of primitive type)
      • array of structures (if query points to field of AoS type or structure)
  • query syntax 
    • separators ( / . | ) - path within tree
    • brackets () []   - array
    • indices (fortran style)
      • ":" all elements
      • "x:y" (from x to y)
      • ":y" from begin to y
      • "x:" from x to the last 

 

 

 

 

 

 

 

 

 

 

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