Help understand: Passing a function handle to another function as an argument
조회 수: 1 (최근 30일)
이전 댓글 표시
set(S.fh,'windowbuttonmotionfcn',{@fh_wbmfcn,S})
I know @ is a handle to a separately defined function called fh_wbmfcn, but am puzzled about what the {} brackets are doing. Are they passing in S as an input to fh_wbmfcn? I have never seen this syntax before and it is hard to search the documentation for characters like @ or {}.
댓글 수: 0
채택된 답변
Walter Roberson
2017년 6월 9일
Remember that every graphics callback is automatically passed two initial arguments: the source and the event data. Using the cell array {@fh_wbmfcn,S} has the same effect as if you had specified @(src,event) fh_wbmfcn(src, event, S)
댓글 수: 3
Walter Roberson
2017년 6월 9일
"Is it possible to pass the output arguments of fh_wbmfcn which are Cx, Cy to the workplace of function that calls it"
Sorry, no, callbacks are never invoked with output assigned. Callbacks are executed as if called from the base workspace, because they are invoked asynchronously. Functions do not call callbacks (but functions might define callbacks.)
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Interactive Control and Callbacks에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!