fcdbabfc-e984-44a7-a644-e0cc0312d005 27 zhkz 4 5 false false 0 0 decimal

&[DATE] &[TIME] - &[FILENAME]

datax 0.0265 0.0778 0.1291 0.1804 0.2317 0.283 0.3343 0.3856 0.4369 0.4882 0.5395 0.5908 0.6421 0.6934 0.7447 0.796 0.8473 0.8986 0.9499 1.0012 1.0525 1.1038 221 mat :

datay 101610141002996970906893875850779775726706675661647611591588575558553221 mat :

data datax datay augment :

nb 0 :

nc 0 :

Extract separate data sets:

i 1 datax length range datax i el 0.6 ≤ nb nb 1 + : xb nb el datax i el : yb nb el datay i el : 31 line nc nc 1 + : xc nc el datax i el : yc nc el datay i el : 31 line if 11 line for

Define matrix functions

N x M N x i el i 1 N sum x i el (2^i 1 N sum x i el i 1 N sum x i el (2^i 1 N sum x i el (3^i 1 N sum x i el (2^i 1 N sum x i el (3^i 1 N sum x i el (4^i 1 N sum 33 mat :

N x y V y i el i 1 N sum y i el x i el * i 1 N sum y i el x i el (2^* i 1 N sum 31 mat :

Least squares fit for both sets:

b1 b2 b3 31 mat nb xb M 1 -^nb xb yb V * :

b1 b2 b3 31 mat 1033.4164 216.1802 - 525.3724 - 31 mat

c1 c2 c3 31 mat nc xc M 1 -^nc xc yc V * :

c1 c2 c3 31 mat 1196.4107 1014.5151 - 390.0593 31 mat

x y b1 b2 x * + b3 x 2^* + x 0.6 ≤ c1 c2 x * + c3 x 2^* + cases :

Define quadratic function

Plot data vs fits

data y 2 1 sys