Using your data file, I get:
$ cat v.m
clear all
inputData = load( "test.dat" );
x = inputData( : , 1 );
y = inputData( : , 2 );
P = polyfit(x,y,10);
ynew = polyval(P,x);
$ cat test.dat
-1196.4 315571.7086
-1195.2 315575.9618
-1194 315579.4195
-1192.8 315582.6206
-1191.6 315585.4966
-1190.4 315588.3172
-1189.2 315590.9326
-1188 315593.5934
-1186.8 315596.0455
-1185.6 315598.4201
-1184.4 315600.7143
-1183.2 315602.9508
-1182 315605.1765
So v.m has your commands and test.dat is your data file. Now, running
v.m, I get
octave:2> norm(y-ynew)
ans = 6.3300
While Matlab's result is slightly better (norm of difference is ~0.4), I
don't see the results to differ that much? Oh, and Matlab warns about
the polynomial being badly conditioned.
Thomas
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