[問題] 使用function的執行速度
[問題類型]:
效能諮詢(我想讓R 跑更快)
[軟體熟悉度]:
入門(寫過其他程式，只是對語法不熟悉)
[問題敘述]:
問題是關於運算速度的差異
1.在A function中又使用了B function作運算
Ex.
r = abs(diff(P[(t-(N+1)):(t-1)]))
sum(r)/N
2.先執行B function，將結果以b儲存，在將b用A function作運算
Ex.
sum(abs(diff(P[(t-(N+1)):(t-1)])))/N
以上兩種寫法想請教一下，在執行的速度上會有很大的差異嗎?
小弟完整的程式中會是包更多個function
煩請大大們給予點建議，謝謝 ^^
[程式範例]:
--
離開你的視線~讓情緒完完整整的宣洩~
我想今夜就這樣吧~
反正孤獨也無所謂~
--
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※ 編輯: PhysicsBoy (61.228.141.5), 09/10/2015 23:32:35
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