[Gnuplot-info] Design of Experiment Data Plotting

[chuckh <crh...@ya...>]

Hi there,

I'm hoping someone can help me as I've read so much information and haven't
found out what I am doing wrong.

Basically I am using a welding technology to develop a process for a medical
customer. The welding process uses two main input parameters (Force and
time). The customer is looking for a strong and aesthetically pleasing
product. The higher the time and force the stronger the result is but the
worse the aesthetic quality becomes. I'm looking to 3d plot the two input
parameters and the result of the strength test (pull force value) and
aesthetic quality (subjective 0-10 rating).

Example script looks something like the following using gnuplot 4.4 patch 3:

#Force vs. Time vs. Strength
set xlabel "Force"
set ylabel "Time"
set zlabel "Strength"
set pm3d
set dgrid3d
set contour
set grid
splot 'XXXXX.dat' with lines

# XXXXX.dat file looks like the following:
#left: force   middle: time   right: strength
50	0.01	100
50	0.01	102.12
50	0.01	98.55
50	0.011	109.43
50	0.011	111.21
50	0.011	113.12
50	0.012	121.9
50	0.012	119.14
50	0.012	120.19
		
46	0.01	98.11
46	0.01	96.59
46	0.01	95.12
46	0.011	104.11
46	0.011	103.98
46	0.011	105.21
46	0.012	115.78
46	0.012	113.21
46	0.012	117.21
		
48	0.01	99.12
48	0.01	98.99
48	0.01	100.1
48	0.011	108.11
48	0.011	107.66
48	0.011	109.11
48	0.012	118.11
48	0.012	119.21
48	0.012	120.09

The problem I'm seeing is that the graph looks like this:
http://old.nabble.com/file/p31291642/example.png 

You see how the corners look like "horns". I would expect or should say want
to have the graph roll more like a ramp. i.e. ramp up towards a higher time
value and ramp down towards a lower time value.

Can anyone point out some tips on how to resolve this? Thanks
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