To get blank lines in the data that is sent to gnuplot, put your data
into a 3-d array then pass the array to Gnuplot.Data. In other words,
you currently have
x = [1,1,1,2,2,2,3,3,3,4,4,4]
y = [1,2,3,1,2,3,1,2,3,1,2,3]
z = [z(1,1),z(1,2),z(1,3),z(2,1),...]
val = [val(1,1), ...]
Instead, create an array as follows:
data = [
[
[1,1,z(1,1),val(1,1)],
[1,2,z(1,2),val(1,2)],
[1,3,z(1,3),val(1,3)],
],
[
[2,1,z(2,1),val(2,1)],
[2,2,z(2,2),val(2,2)],
[2,3,z(2,3),val(2,3)],
],
...
]
Then plot the data with
resG.splot(Gnuplot.Data(data))
You could create the data array from your old lists using something like
(untested!):
data = Numeric.asarray([x,y,z,val], Numeric.Float32)
# Change the order of the indices to "zip" the arrays together:
data = Numeric.transpose(set, (1,0))
data = Numeric.reshape((4,3,4,), data)
If you generate the data using functions (and if you are using python 2
or above), an even easier way would be to use
data = [[[x,y,z(x,y),val(x,y)] for y in yvals] for x in xvals]
Hope that helps.
Michael
Marc Hodapp wrote:
> when using gnuplot directly, I can create 4d data plots with
> something like:
>
> set pm3d
> splot 'file.dat' using 1:2:3:4
>
> Where file.dat is the data file, 1,2,3 are the columns with the x,y,z
> data and 4 is the column with the value data which defines the color
> value.
>
> Now I want to do the same thing using gnuplot.py. In my python
> program, I define 4 lists: x, y,z,val. I then use the instructions:
>
> resG = Gnuplot.Gnuplot()
> resG('set pm3d')
> resG.splot(Gnuplot.Data(x,y,z,val))
>
> What I get as a result, is a 3d plot with my points, but no colored
> surface showing val . So my questions are: Can Gnuplot.Data() receive
> 4 arguments, which are then passed to splot and pm3d? When using
> gnuplot directly, the file must contain blank lines between two scans
> (isolines). In gnuplot.py do I have to include empty strings in the
> x,y,z,val lists to delimit the isolines? How can I delimit these scans
> in gnuplot.py? Is there an other way to plot my surface using the
> xyz,val lists ( like resG('splot ...') )?
--
Michael Haggerty
mh...@al...
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