How to use regression to find equation of data set?
1 view (last 30 days)
Show older comments
Dear All,
I would like to ask for some help.
I am trying to find the equation present my data.
But io stuck when use regression method.
could someone help me?
i assume my equation is:
z = a*x^n +b*y+c
Thanks so much!
Han
x = [12 12.5 13 13.5 14
]
y = [61 61.5 62 62.5 63
]
z = [120 114 103 93 80
124 120 109 97 85
128 121 113 101 88
130 125 116 105 92
134 128 119 109 96
]
surf(x,y,z)
0 Comments
Accepted Answer
KSSV
on 3 Nov 2022
x = [12 12.5 13 13.5 14] ;
y = [61 61.5 62 62.5 63] ;
[X,Y] = meshgrid(x,y) ;
Z = [120 114 103 93 80
124 120 109 97 85
128 121 113 101 88
130 125 116 105 92
134 128 119 109 96] ;
x = X(:) ;
y = Y(:) ;
z = Z(:) ;
sf = fit([x, y],z,'poly22')
plot(sf,[x y],z)
5 Comments
KSSV
on 5 Nov 2022
x = [12 12.5 13 13.5 14] ;
y = [61 61.5 62 62.5 63] ;
[X,Y] = meshgrid(x,y) ;
Z = [120 114 103 93 80
124 120 109 97 85
128 121 113 101 88
130 125 116 105 92
134 128 119 109 96] ;
x = X(:) ;
y = Y(:) ;
z = Z(:) ;
sf = fit([x, y],z,'poly22')
zi = sf(x,y) ;
figure
hold on
surf(X,Y,Z)
plot3(x,y,zi,'*b')
view(3)
More Answers (0)
See Also
Categories
Find more on Spline Postprocessing in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!