gnuplot-info

[Gnuplot-info] Problem with splot

[l_johan_k <l_j...@ho...>]

Hej!

I want to graph a surface in gnuplot of the following matrix:

0 0 0 0 0 0	
0 0.00641154 0.01751273 0.01554609 0.00609739 0
0 -3.502E-05 0.009302	0.02995384	0.01733484	0	
0 0.02041813 0.03013938 -0.17901065 -0.18546722	0
0 0.00014728 0.00946959 0.03005793 0.01772059 0
0 0 0 0 0 0

I use the following settings:

unset surface
set terminal windows color enhanced
set ticslevel 0
set xtics(" " 0, "1" 1, "2" 2, "3" 3, "4" 4, " " 5)
set ytics(" " 0, "1" 1, "2" 2, "3" 3, "4" 4, " " 5)
set grid
set dgrid3d 70,70
set pm3d
splot "filname.txt" matrix

(filename.txt = matrix)

The problem is that the plot doesn't show the correct values.

Anyone who can help me?

Best wishes,

l_johan_k
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Re: [Gnuplot-info] Problem with splot

[Thomas S. <t.s...@fz...>]

with 'set dgrid3d 70,70' you are interpolating over the matrix
with an inappropriate grid.

the arguments to 'set dgrid3d' should be:
n * (number_of_xdata - 1) + 1
n * (number_of_ydata - 1) + 1

otherwise your interpolation grid will not contain the data points
you have given.

> I want to graph a surface in gnuplot of the following matrix:
>
> 0 0 0 0 0 0	
> 0 0.00641154 0.01751273 0.01554609 0.00609739 0
> 0 -3.502E-05 0.009302	0.02995384	0.01733484	0	
> 0 0.02041813 0.03013938 -0.17901065 -0.18546722	0
> 0 0.00014728 0.00946959 0.03005793 0.01772059 0
> 0 0 0 0 0 0
>
> I use the following settings:
>
> unset surface
> set terminal windows color enhanced
> set ticslevel 0
> set xtics(" " 0, "1" 1, "2" 2, "3" 3, "4" 4, " " 5)
> set ytics(" " 0, "1" 1, "2" 2, "3" 3, "4" 4, " " 5)
> set grid
> set dgrid3d 70,70
> set pm3d
> splot "filname.txt" matrix
> 
> (filename.txt = matrix)
> 
> The problem is that the plot doesn't show the correct values.

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Re: [Gnuplot-info] Problem with splot

[l_johan_k <l_j...@ho...>]

Thomas, many thanks! Now its working.

One more question...

Since my graph consists of discrete points I would like to have a flat
surface between the values (preferably in the xy-plane). Is this possible?

(I.e. I would like to have a "cone" for each matrix element, but with a flat
surface between the elements.)

Its hard to explain...

/Johan
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Re: [Gnuplot-info] Problem with splot

[Thomas S. <t.s...@fz...>]

> One more question...
>
> Since my graph consists of discrete points I would like to
> have a flat surface between the values (preferably in the
> xy-plane). Is this possible?
>
> (I.e. I would like to have a "cone" for each matrix element,
> but with a flat surface between the elements.)
>
> Its hard to explain...

you are looking for a  3d bar chart or lego plot.
well, that's not possible, AFAIK, but a poor man's
solution would be:

you may use impulses:

splot "filename.dat" matrix w imp lw 5

to have a surface at z=0:

set iso 6,6
splot "filename.dat" matrix w imp lw 5, 0

or

set iso 6,6
splot "filename.dat" matrix us 1:2:($3<0?$3:0) w imp lc 3 lw 10, 0, ""
matrix us 1:2:($3>0?$3:0) w imp lc 1 lw 10

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Re: [Gnuplot-info] Problem with splot

[l_johan_k <l_j...@ho...>]

Thanks for the help!

Two more questions...

Is it possible to get a z-scale where "-" is "up"?

Does anyone have a nice palette? I usually use the "standard" or "set
palette defined (-3 "blue", 0 "white", 1 "red")"?

/Johan
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Re: [Gnuplot-info] Problem with splot

[Thomas S. <t.s...@fz...>]

> Thanks for the help!
>
> Two more questions...
>
> Is it possible to get a z-scale where "-" is "up"?

set zrange [*:*] reverse

> Does anyone have a nice palette? I usually use the
> "standard" or "set palette defined (-3 "blue", 0 "white", 1 "red")"?

have a look at 'help palette' and then see what the actual
palette looks like with 'test palette'.
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