[Gnuplot-info] problem controlling fit length within given x values

[smms <sm...@ho...>]

I am trying to fit my data and control their lengths between b x_min x_max.
So renamed my functions with corresponding x_min and x_max values. But not
succeeding to control their length. Any suggestion pls? Many thanks and here
are my data and codes.

x1	           y1	      sd1	   x2	    y2	          sd2	      x3	   y3	         
sd3
611.75	 44.330	2.015	   638.65	41.417	1.848	    627.4	45.311	4.668
640.65	 42.821	2.161	   619.10	47.912	1.176	    607.0	56.682	2.234
637.35	 49.475	2.672	   623.95	50.669	3.419	    584.5	62.197	2.266
617.00	 52.755	2.917	   602.20	55.996	1.508	    522.0	70.550	4.751
602.30	 59.032	3.325	   530.95	71.744	3.519	    413.5	80.528	4.412
545.90	 67.169	3.351	   436.20	80.660	2.877	    286.9	87.453	4.542
467.40	 84.709	5.217	   372.35	84.351	3.640	    209.3	89.979	2.185
336.50	 90.083	4.053	   249.50	96.568	3.355	    96.8	96.859	3.476

f8(x) = a8*x*x+b8*x+c8
f_p(x, min, max) = (x >= min && x <= max) ? f8(x) : 1/0
fit f_p(x,min,max) 'data.txt' u 1:2 via a8,b8,c8
plot 'data.txt' u 1:2:3 w errorbars t '800', f_p(x,min,max) t 'f(800)' 

min=250 ; max=624;	
f10(x) = a10*x*x+b10*x+c10
f_q(x, min, max) = (x >= min && x <= max) ? f10(x) : 1/0
fit f_q(x,min,max) 'data.txt' u 4:5 via a8,b8,c8
replot 'data.txt' u 4:5:6 w errorbars t '1000', f_q(x,min,max) t 'f(1000)'

min=97 ; max=585;	
f12(x) = a12*x*x+b12*x+c12
f_q(x, min, max) = (x >= min && x <= max) ? f12(x) : 1/0
fit f_q(x,min,max) 'data.txt' u 7:8 via a12,b12,c12
replot 'data.txt' u 7:8:9 w errorbars t '1200', f_q(x,min,max) t 'f(1200)'









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