Re: [Gnuplot-info] 3-d-fitting

[Spinora <N.M...@gm...>]

Thomas Sefzick wrote:
> 
> could you make an example available? (data file, function)
> 
> 
...something's broken either with my browser or with this website... when i
click a link it keeps just reloading the page i'm on...

my favorite function was

f(x,y)= a*(sgn(x-b+c)-sgn(x-b-c))

which is a stepfunction of the height a, width c and offset b.

my data looks like this:
0	0	0
1	0	0
2	0	0
3	0	0
4	0	1
5	0	15
6	0	20
7	0	3
8	0	0
9	0	0
10	0	0
0	1	0
1	1	0
2	1	0
3	1	0
4	1	0
5	1	11
6	1	20
7	1	1
8	1	1
9	1	0
10	1	0
0	2	0
1	2	0
2	2	0
3	2	2
4	2	1
5	2	16
6	2	16
7	2	0
8	2	0
9	2	0
10	2	0
0	3	0
1	3	0
2	3	0
4	3	3
5	3	18
6	3	21
7	3	11
8	3	0
9	3	0
10	3	0
0	4	0
1	4	0
2	4	0
3	4	0
4	4	1
5	4	4
6	4	15
7	4	6
8	4	0
9	4	0
10	4	0

does that help?

startingvalues I've tried were a=20, b=6, c=2
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