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Newsgroups: comp.graphics.apps.gnuplot
Date: Mon, 11 Jan 2021 21:17:08 -0800 (PST)
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Subject: Re: Select data points in interactive terminal
From: "jindi.li" <jindi.li@gmail.com>
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Xref: csiph.com comp.graphics.apps.gnuplot:4390

I'm Quite happy to notice the Conditional Plotting in gnuplot, which solve my initial question,
I need to remove some data point in the plot graph without touch my real data.

I post the line work for me here in case someone need that too.

Yes, as simple as:
$>: plot 'scale.csv' u ($1>=0?$1:NaN)

which I didn't notice yet.