作者查詢 / bxxl
作者 bxxl 在 PTT [ R_Language ] 看板的留言(推文), 共31則
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3F推: fft的第一個值就是所謂的DC值,也就是=sum(data)12/15 00:38
4F推: 喔對了,大部分y軸會用log scale(單位dB)去畫圖12/15 15:45
5F→: 這樣就不會因為DC很大而看不清楚頻率成份12/15 15:46
1F推: 作這件事需要一些數位訊號處理的知識喔07/23 23:35
2F→: 如果只想用套件抄範例應該無法07/23 23:36
3F推: 最簡單的想法,把y-a就變成截距為0了12/12 10:27
6F推: 在command line跟IDE中間還有R的interpreter啊?04/02 12:52
7F→: 你是講真的command line(OS的)還是R的 interpreter?04/02 12:53
21F推: 那個錯誤訊息是資料有7400行而不是程式碼02/01 12:20
1F推: 那只是顯示方法而已,"\\"就是代表一個\01/26 17:51
2F→: 你用nchar()看字串長度就知道了01/26 17:51
3F推: 另外好像可以用cat()顯示出單一\01/26 17:56
2F推: 看文件裡有沒有寫log.p代表什麼設定,感覺是approximation11/17 16:53
3F推: 可能是計算過程中,有沒有把機率變成log表示?11/17 16:58
8F推: 要attch才能直接使用column名當變數,不然就要用xxx$yyy這樣11/13 17:18
5F推: 那是系列課程,github在第一門課toolbox有講10/30 08:59
1F推: 寫A[i,]沒問題,這代表第i個row, 是一個vector10/16 12:31
2F→: 你應該要把錯誤訊息貼上來,別人才不必猜測10/16 12:32
3F→: 另外矩陣的columns可以擴充,用cbind把額外的columns併入10/16 12:34