Incorrect dimensions for matrix multiplication

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Mathew Aibinu
Mathew Aibinu 2024-5-31
编辑： VBBV 2024-5-31
Ran in:
clear all; close all;
% param value
k0 = 0.244; p=536.2; q=0.0000376;
% the function
k = @(t,u) (k0 + (p*k0.^u-q*k0)*t +(p*k0.^u-q*k0).*(p*u*k0.^u-q)*t.^2/factorial(2)...
+(p*k0.^u-q*k0).*((p*u*k0.^u-q).^2-p*u*(u-1)*k0.^(u-1)./2)*t.^3/factorial(3));
% grid
t = linspace(0,0.1);
u = linspace(0.3,0.9);
[T,U] = meshgrid(t,q);
% evaluate function
Z = k(T,U);
Error using *
Incorrect dimensions for matrix multiplication. Check that the number of columns in the first matrix matches the number of rows in the second matrix. To operate on each element of the matrix individually, use TIMES (.*) for elementwise multiplication.

Error in solution>@(t,u)(k0+(p*k0.^u-q*k0)*t+(p*k0.^u-q*k0).*(p*u*k0.^u-q)*t.^2/factorial(2)+(p*k0.^u-q*k0).*((p*u*k0.^u-q).^2-p*u*(u-1)*k0.^(u-1)./2)*t.^3/factorial(3)) (line 5)
k = @(t,u) (k0 + (p*k0.^u-q*k0)*t +(p*k0.^u-q*k0).*(p*u*k0.^u-q)*t.^2/factorial(2)...
% plot
figure
surf(T,U,Z)
%surf(T,Q,Z,'facecolor','none')

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采纳的回答

VBBV
VBBV 2024-5-31
编辑：VBBV 2024-5-31 
k = @(t,u) (k0 + (p*k0.^u-q*k0).*t +(p*k0.^u-q*k0).*(p*u*k0.^u-q).*t.^2/factorial(2)...
  +(p*k0.^u-q*k0).*((p*u.*k0.^u-q).^2-p*u.*(u-1)*k0.^(u-1)./2).*t.^3/factorial(3));
% grid
  1 个评论
VBBV
VBBV 2024-5-31
编辑：VBBV 2024-5-31

Use element wise matrix multiplication in the anonymous function as above. Also use a finite number of elements for vectors t and u as below

% grid
t = linspace(0,0.1,30);
u = linspace(0.3,0.9,30);
[T,U] = meshgrid(t,u);

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