Unable to perform assignment because the left and right sides have a different number of elements.

Question

Jon Bilbao 2023-2-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1917135-unable-to-perform-assignment-because-the-left-and-right-sides-have-a-different-number-of-elements

回答： Kevin Holly 2023-2-22

I want to make a function tha carculates de speed of a train that accelerates uniformly en every point of the train having acceleration(a), train length (Lt) and start speed (v0) as inputs and i don t know why this error appears.

Does anyone know how to solve this?

Thanks

ERROR:Unable to perform assignment because the left and right sides have a different number of elements.

Error in VelTren (line 9)

v(i)=((v0.^2)+2*a*l).^(1/2);

function [v] = VelTren(v0,a,Lt)
l=0:0.1:Lt;
v=zeros(1,length(l));
v(1)=v0;
    for i=2:length(l)
        v(i)=((v0.^2)+2*a*l).^(1/2);
        
    end
end

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Answer 1

Kevin Holly 2023-2-22

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1917135-unable-to-perform-assignment-because-the-left-and-right-sides-have-a-different-number-of-elements#answer_1177555

在 MATLAB Online 中打开

VelTren(1,9.81,46)
ans = 1×461
    1.0000    1.7210    2.2190    2.6241    2.9746    3.2879    3.5738    3.8385    4.0861    4.3195    4.5409    4.7521    4.9542    5.1484    5.3355    5.5163    5.6914    5.8612    6.0263    6.1869    6.3435    6.4963    6.6456    6.7916    6.9346    7.0746    7.2119    7.3467    7.4790    7.6091

You need to change l to l(i).

function [v] = VelTren(v0,a,Lt)
l=0:0.1:Lt;
v=zeros(1,length(l));
v(1)=v0;
    for i=2:length(l)
        v(i)=((v0.^2)+2*a*l(i)).^(1/2);
        
    end
end