6)ลบล้างคอลัมน์หรือจำนวนแถวในสเปนเซอร์รี้ดครับ r

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ลบโพรโทคอล aimcomment ค่าจากคอลัมน์ในสเปนเซอร์รี้ดครับ r

 df[!(is.na(df$start_pc) | df$start_pc==""), ]

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