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Scilab Help >> Data Structures > isfield


checks if the given fieldname exists in a structure or mlist or tlist


bool = isfield(s, fieldname)



a struct array, a tlist or a mlist.


a matrix of strings: names of fields to be detected


a matrix of boolean (same format as fieldname>)


This function returns %t if the specified structure or tlist or mlist s includes the field fieldname, regardless of the corresponding value. For a structure, the hidden field dims is ignored.


s = struct("field_1",123,"field_2",456,"field_4",789)

// Single Fieldname Syntax
isfield( s , "field_1"  )

// Multiple Fieldname Syntax
isfield( s , [ "field_1" "field_2" ; "field_3" "field_4" ] )

// with a tlist:
s = tlist(["test" "t" "n","","p"], "Hello", %pi, "anonymous", (1-%z)^3)
isfield(s, ["b" "t" ""])  // =>  F  T  T  (anonymous fields can be detected)

See also

  • struct — Builds a structure or an array of structures
  • tlist — Scilab object and typed list definition.
  • mlist — Scilab object, matrix oriented typed list definition
  • getfield — list field extraction
  • definedfields — returns an index of list's defined fields


5.5 Extension to any mlist and tlist.
Report an issue
<< getfield Data Structures isstruct >>

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Last updated:
Mon Jan 03 14:23:29 CET 2022