OpenXM_contrib/gnuplot/demo/fit.dem - diff

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version 1.1.1.2, 2000/01/22 14:16:06

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

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 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 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