Re: [Gnuplot-info] keyword using with binary data matrix

[Ethan A M. <eam...@gm...>]

On Thursday, 27 September 2018 16:56:53 Edmond Rodriguez wrote:
> So I can read a matrix of binary data and make an image plot like this:
> 
> plot "file" binary array=18000x4500 flipy format='%int16' with image
> 
> But I want to manipulate the points with using keyword.   

Gnuplot does not support that.


> But I cannot.
> 
> So I have to do this:
> 
> dump the binary file to ascii:
> od -v -An -t d2 -w36000 file | tac > file.asc
> 
> Then I can plot:
> plot 'file.asc' matrix using 1:2:3 with image palette
> or change values:
> plot 'file.asc' matrix using ($1/50):2:3 with image palette
> 
> How do I accomplish the "using" in the binary method
> 
> The reason I want to do this is so I can do math  on the numbers.
> 
>  I want to do something like this but I am not getting it right:
> 
> plot "file" binary array=18000x4500 flipy format='%int16'  using
> ($1/50):2:3 with image

I take it that what you want is to shrink the range of x coordinate
occupied by the image.  There is a keyword for that
  plot "file" binary array=18000x4500 dx=0.02 dy=1.0 ...

For examples see
  http://gnuplot.sourceforge.net/demo_5.3/barchart_art.html