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) |  |  |
| Version | Description |
| 5.5 | Extension to any mlist and tlist. |