gnuplot: 3D plot of a matrix of data

Question

How can I plot (a 3D plot) a matrix in Gnuplot having such data structure, using the first row and column as a x and y ticks (the first number of the first row is the number of columns) ?

4 0.5 0.6 0.7 0.8
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

Answer 1

Exactly this data format can be read in with matrix nonuniform:

set view 50,20
set ticslevel 0
splot 'data.txt' matrix nonuniform with lines t ''

This generates the correct tics, like specified in the data file: