help me about nlinfit
10 views (last 30 days)
Show older comments
i want to solve nonlinear regression problem. input variable 'x' is two element. also output variable 'T' = two element.
but An error has occurred in matlab.
how can i solve it.
help me.....
here is my code.
clear all close all clc;
x(1,:) = 0:1:100; x(2,:) = 100:1:200; v = [4 8 5 3 ]; mdl = @(b,t)( b(1)*t.^3 + b(2)*t.^2 + b(3)*t + b(4)); T = mdl(v,x); S = mdl(v,x) + 10000*randn(1,101); beta0 = [0 0 0 0]; beta = nlinfit(x,S,mdl,beta0); %beta %result = mdl(beta,x);
figure(1) grid on hold on
plot(S','ro') %plot(result)6
0 Comments
Accepted Answer
Prajit T R
on 19 Mar 2018
Hi Kim
The second argument to the nlinfit function only accepts a vector. So it would be better to fit 'x' element-wise. I have modified your code to illustrate the same. I am not sure if this is what you're looking for, but this might help:
x(1,:) = 0:1:100;
x(2,:) = 100:1:200;
v = [4 8 5 3 ];
mdl = @(b,t)( b(1)*t.^3 + b(2)*t.^2 + b(3)*t + b(4));
T = mdl(v,x);
S = mdl(v,x) + 10000*randn(1,101);
beta0 = [0 0 0 0];
size(x)
size(S)
beta1 = nlinfit(x(1,:),S(1,:),mdl,beta0);
beta2 = nlinfit(x(2,:),S(2,:),mdl,beta0);
result = mdl([beta1 beta2],x);
figure(1)
grid on
hold on
plot(S','ro')
figure
plot(result)
Cheers
0 Comments
More Answers (0)
See Also
Categories
Find more on 회귀 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!