Gnuplot: Vertical lines at specific positions

Question

I'm reading data from a csv file in help of gnuplot. Most of the lines have 8 columns, some of them 9. Whenever there are 9 columns, I'd like to draw a vertical line (think of marking that position). Can I achieve that with gnuplot? JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

You could use (and suppose that my point in x-axes is 0.35, and I want for entire y-axes ): set arrow from 0.35,graph(0,0) to 0.35,graph(1,1) nohead Or, if you want show this in a specific y range{ymin,ymax} set arrow from 0.35,ymin to 0.35,ymax nohead If you want to customize more you can use: set style arrow {idx:index} default set style arrow {idx:index} [ nohead | head | backhead | heads ] [ size {flt:length} [,{flt:angle}] [,{flt:backangle}] ] [ filled | empty | nofilled ] [ front | back ] [ [ linetype | lt {idx:type} ] [ linewidth | lw {int:width} ] | [ linestyle | ls {idx:style} ] ] For more information inside gnuplot run: help arrow