Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.graphics.apps.gnuplot > #3528

plotting an adaptive mesh

Show all headers | View raw

Hello,

I am doing some calculations on the basis of an adaptive mesh. So, my data look like:

|----|----|---------|---------|
|  1 | 6  |         |         |
|----|----|    4    |    9    |
|  2 | 9  |         |         |
|----|----|----|----|---------|
|         |  1 | 8  |         |
|    5    |----|----|    2    |
|         |  8 | 5  |         |
|---------|----|----|----|----|
|         |         |  8 | 2  |
|    1    |    4    |----|----|
|         |         |  3 | 7  |
|---------|---------|----|----|

I want to plot these data with an 2D heat map.

To do so, I am expanding the fine pitched mesh to the hole data set 
|----|----|---------|---------|
|  1 | 6  |  4 | 4  |  9 | 9  |
|----|----|----|----|----|----|
|  2 | 9  |  4 | 4  |  9 | 9  |
|----|----|----|----|---------|
|  5 | 5  |  1 | 8  |  2 | 2  |
|----|----|----|----|----|----|
|  5 | 5  |  8 | 5  |  2 | 2  |
|---------|----|----|----|----|
|  1 | 1  |  4 | 4  |  8 | 2  |
|----|----|----|----|----|----|
|  1 | 1  |  4 | 4  |  3 | 7  |
|---------|---------|----|----|
and used "plot "data.dat" with image pixels".

This works, but it generates big data set (30MB) and also a big image (my used output is svg -> ~60MB) and is against the idea of an adaptive mesh.

In stackoverflow, I have found the idea to use set pm3d corners2color:
http://stackoverflow.com/questions/19294342/heatmap-with-gnuplot-on-a-non-uniform-grid

But this doesn't help in my case as the fine pitched pixels are not in one column but span over a diagonal.


A new idea would be to plot each rectangle by myself and filling it with a color according to its data value. I remember something like a statistics command in gnuplot, but I can't remember the details. Furthermore I am wondering if I have to print the rectangle command for each rectangle I want to draw (in principle I can do that because I produce the data by myself but printing some repetitive text ~1000 times will blow up again the data file) or if I can use a command that reads the values written in the data file.

Or this is all not a good idea and maybe there is an easy way to plot an adaptive mesh in gnuplot?

Thanks for any help.

Back to comp.graphics.apps.gnuplot | Previous | Next — Next in thread | Find similar

Thread

plotting an adaptive mesh maierd83@gmail.com - 2017-01-17 01:54 -0800
  Re: plotting an adaptive mesh Karl Ratzsch <mail.kfr@gmx.net> - 2017-01-17 11:18 +0100
    Re: plotting an adaptive mesh maierd83@gmail.com - 2017-01-17 04:49 -0800
      Re: plotting an adaptive mesh Karl Ratzsch <mail.kfr@gmx.net> - 2017-01-17 14:11 +0100
        Re: plotting an adaptive mesh maierd83@gmail.com - 2017-01-17 06:05 -0800
          Re: plotting an adaptive mesh Karl Ratzsch <mail.kfr@gmx.net> - 2017-01-17 15:25 +0100
            Re: plotting an adaptive mesh maierd83@gmail.com - 2017-01-17 07:25 -0800
              svg with bitmap image graph? (was: Re: plotting an adaptive mesh) Karl Ratzsch <mail.kfr@gmx.net> - 2017-01-17 21:36 +0100
                Re: svg with bitmap image graph? (was: Re: plotting an adaptive mesh) Ethan A Merritt <sfeam@users.sourceforge.net> - 2017-01-17 14:41 -0800
  Re: plotting an adaptive mesh maierd83@gmail.com - 2017-01-17 06:07 -0800

csiph-web