Incorrect dimensions for matrix multiplication

2024 5 31
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更新时间：2024 5 31
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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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VBBV
VBBV 2024-5-31
编辑：VBBV 2024-5-31

0 个投票

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

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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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