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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