Error using vertcat and how to solve it?

Question

Md. Golam Zakaria 2023-2-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1908350-error-using-vertcat-and-how-to-solve-it

编辑： Stephen23 2023-2-7

Hello everyone, I am getting Error using vertcat, Dimensions of arrays being concatenated are not consistent, error for the following code. Can anyone please point me out my error and how to fix it.

clc
clear all
f = @(t,x) [-x(4)-(0.424)+(1.6977)*exp(-1.35*10^20*(x(1)^2));
            x(4)-(0.663)+(2.6540)*exp(-1.35*10^20*(x(2)^2));
           -(2.994*10^5)*x(4);
           (7.124*10^17*(x(1)^2)-7.124*10^17*(x(2)^2)+x(3)+60*(cos(t))) -2.55*10^7*x(4)];
       
[t,xa] = ode45(f,[0, 80],[0,0,-62,0]);

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Answer 1

Stephen23 2023-2-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1908350-error-using-vertcat-and-how-to-solve-it#answer_1165990

编辑：Stephen23 2023-2-7

在 MATLAB Online 中打开

f = @(t,x) [-x(4)-(0.424)+(1.6977)*exp(-1.35*10^20*(x(1)^2));
    x(4)-(0.663)+(2.6540)*exp(-1.35*10^20*(x(2)^2));
    -(2.994*10^5)*x(4);
    (7.124*10^17*(x(1)^2)-7.124*10^17*(x(2)^2)+x(3)+60*(cos(t)))-2.55*10^7*x(4)];
%                                                              ^^ removed space character

A space character is a delimiter that separates elements horizontally, equivalent to a comma. Because of that space character you were trying to concatenate rows together which had [1,1,1,2] columns. Clearly that doesn't work.