[問題] find找不到的處理已回收
A=[ 20090909
20090910
20090913]
B=find(A==20090911)
想要若找不到20090911就顯示零,
但是用find找不到東西就會出現錯誤,
如果用迴圈又很耗時,
請問有沒有類似find的函數可以處理,謝謝!
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