Variable X must be of size [12 4]. It is currently of size [12 5]. Check where the variable is assigned a value.

조회 수: 7 (최근 30일)
m = 1:12; m = m';
Y = [2.8 3.5 4.7 6.3 6.6 7 6.4 5.8 5.3 4.2 3.4 2.6]';
% Part (a)
X = [ones(size(m)) m m.^2 m.^3 m.^4 ];
z = X'*Y;
S = X'*X;
U = chol(S);
w = U'\z;
disp('(a) Coefficients:')
c = U\w
plot(m,Y,'o'), hold on
q = min(m):0.1:max(m);
fit = c(1) + c(2)*q + c(3)*q.^2 + c(4)*q.^3 + c(5)*q.^4;
plot(q, fit), hold off
xlabel('m'), ylabel('Y')
legend('Data Points', 'Curve Fit')
title('Part (a)')
% Part (b)
c = X\Y
c = c([5:-1:1]);
figure, plot(m,Y,'o'), hold on
q = min(m):0.1:max(m);
fit = polyval(c, q);
plot(q, fit), hold off
xlabel('m'), ylabel('Y')
legend('Data Points', 'Curve Fit')
title('Part (b)')

답변 (1개)

Arif Hoq
Arif Hoq 2023년 2월 11일
편집: Arif Hoq 2023년 2월 11일
check in line 4
m = 1:12;
m = m';
Y = [2.8 3.5 4.7 6.3 6.6 7 6.4 5.8 5.3 4.2 3.4 2.6]';
X = [ones(size(m)), m,m.^2, m.^3, m.^4]
X = 12×5
1 1 1 1 1 1 2 4 8 16 1 3 9 27 81 1 4 16 64 256 1 5 25 125 625 1 6 36 216 1296 1 7 49 343 2401 1 8 64 512 4096 1 9 81 729 6561 1 10 100 1000 10000
X = [m,m.^2, m.^3, m.^4]
X = 12×4
1 1 1 1 2 4 8 16 3 9 27 81 4 16 64 256 5 25 125 625 6 36 216 1296 7 49 343 2401 8 64 512 4096 9 81 729 6561 10 100 1000 10000

카테고리

Help CenterFile Exchange에서 Hypothesis Tests에 대해 자세히 알아보기

태그

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by