Gnuplot: How to remove vectors below a certain magnitude from vector field? -

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I have a 2D CFD code which gives me X and Y flow velocity at every point on the grid. I currently have Gnuplot I am looking at data using a vector field. My goal is to see how far the feathers are from the explosion, so if they fall below certain area then they can be prevented by the vectors being shown to everyone in the area, so it will be very clean. Does anyone have an idea to go about this? My current gnuplot script is below, I can also modify the input file as well. Set the set png to 'set the title' Explosion simulation: timestep '. [I: 0: 10]] Set the set png set xrange [0: 5.1] to set yrange [0: 10.1]. Set output 'path / flovel' esprint ('% 04.0f', i). 'PNG Plot' path / flowprint ('% 04.0f', i)

< Using '1. 2: 3: 4' with 'p', I think '.at' seems like you want a type of filtering that is not really, but can be achieved with the following tricks (in Gnuplot " Example: "Help in using the examples"): 
  Operating operator filtering a move data: 1: ($ 3 & gt; 10? $ 2: 1/0) Use conspiracy 'file', which The offers data in three columns of which column Kndarit in two columns, the column ten. `1 / 0` is undefined; `Gnuplot` quietly ignores undefined points, so inappropriate points are pressed. Or you can use pre-defined variable NAn to get the same result.   
 So I think you want something like this in your case  
  conspiracy "data.dat" U 1: 2: ($ 3 ** 2 + $ 4 ** 2 & gt; mag_sq? $ 3: NaN): ($ 3 ** 2 + $ 4 ** 2 & gt; meg_sec? $ 4: nan) w vector   < P> Where mag_sq is the square of your desired magnitude

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