OpenXM_contrib/gnuplot/demo/fit.dem - diff

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version 1.1.1.1, 2000/01/09 17:01:00

version 1.1.1.3, 2003/09/15 07:09:29

Line 11 set title 'data for first fit demo'

plot 'lcdemo.dat'

set xlabel "Temperature T [deg Cels.]"

set ylabel "Density [g/cm3]"

set key below

print "now fitting a straight line to the data :-)"

print "only as a demo without physical meaning"

Line 53 print "It's time now to try a more realistic model fun

Line 54 print "It's time now to try a more realistic model fun

load 'density.fnc'

show functions

print "density(x) is a function which shall fit the whole temperature"

print "range using a ?: expression. It contains 6 model parameters which

print "range using a ?: expression. It contains 6 model parameters which"

print "will all be varied. Now take the start parameters out of the"

pause -1 "file 'start.par' and plot the function (-> return)"

load 'start.par'

Line 106 print "\n\nNotice, however, that this would converge m

Line 107 print "\n\nNotice, however, that this would converge m

print "fitted in a more appropriate co-ordinate system:"

print "fit r 'hemisphr.dat' using 0:($1*$1+$2*$2+$3*$3) via r"

print "where we are fitting f(x)=r to the radii calculated as the data"

print "is read from the file. No x value is required in this case.

print "is read from the file. No x value is required in this case."

pause -1 "(This is left as an excercise for the user). (-> return)"

FIT_MAXITER=0 # no limit : we cannot delete the variable once set

Line 195 set title 'initial parameters'

Line 196 set title 'initial parameters'

plot 'moli3.dat' w e, R(x)

pause -1 "now start fitting... (-> return)"

fit R(x) 'moli3.dat' u 1:2:3 via eta, tc

pause -1 "now look at the result (-> return)"

pause -1 "Hit return to continue"

set title 'fitted parameters'

replot

Line 213 print "Remember that this file will always be appende

Line 214 print "Remember that this file will always be appende

print "from time to time!"

print ""

pause -1 "Done with fitting demo (-> return)"

reset