How to plot 3D matrix CSV data in Gnuplot with splot using the first row and column as the x y coordinates?

Question

How can I plot (a 3D plot) a matrix in Gnuplot having such data structure. I cannot find a way to use the first row and column as a x and y ticks (or to ignore them)

,5,6,7,8
1,-6.20,-6.35,-6.59,-6.02
2,-6.39,-6.52,-6.31,-6.00
3,-6.36,-6.48,-6.15,-5.90
4,-5.79,-5.91,-5.87,-5.46

Is the splot 'data.csv' matrix the correct parameter to use ?

The docs appear to document using the first row/column as coordinates only for the binary format: gnuplot.info/docs_4.2/node330.html what a shame. Related examples at: gnuplot.info/demo_5.3/image2.html I'll just stick to explicit coordinates x0 y0 z00 \n x0 y1 z01 for now. — Ciro Santilli OurBigBook.com
– Ciro Santilli OurBigBook.com, Commented Jul 4, 2020 at 11:12

osti · Accepted Answer · 2010-05-14 14:45:06Z

4

You can give using a format specification; here we need to tell the seperator ','. The following works for me:

splot 'data.csv' using 1:2:3 '%lf,%lf,%lf,%lf' with linespoints pt 6 ps 2 lw 3

except that the first line is ignored, which is probably right?

answered May 14, 2010 at 14:45

osti

4472 silver badges8 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Jakub Czaplicki Over a year ago

Thanks for the quick reply. But if you look at the Y scale - it's not showing the correct values (which should be 5,6,7,8). X scale is OK 1,2,3,4. The Z scale shows values from the row that starts with "2". Btw. I am using Gnuplot 4.4.

Jakub Czaplicki Over a year ago

This pretty much do what I sort of need: splot 'data.csv' using 0:0:2 '%lf,%lf,%lf,%lf,%lf' with linespoints pt 6 ps 2 lw 3 Now I'd like to plot more of such plots like the "fence plot" in the examples.. But that's a different story.

julz12 Over a year ago

Sorry for bringing up this really old thread. I have data that looks exactly like the one posted (even same number of lines & columns). When I try your answer, I only get Formatted input can only handle 7 data columns. What did I do wrong?

Jakub Czaplicki Over a year ago

Indeed. The splot parameters that I used that time, no longer works for Gnuplot 5.0. I quickly checked 4.4, and the command posted here works OK. I suppose this could be a bug in 5.0. I raised a ticket: sourceforge.net/p/gnuplot/bugs/1675

Jakub Czaplicki Over a year ago

@JuliusNaeumann The bug has been fixed, but I am not sure how it will take until next Gnuplot release: github.com/gnuplot/gnuplot/commit/…

Collectives™ on Stack Overflow

How to plot 3D matrix CSV data in Gnuplot with splot using the first row and column as the x y coordinates?

1 Answer 1

5 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related