Number of elements mismatch.

Hi everyone,

I have a dimension issue:

I have a Simulink Matlab Function block that has a [3x1] vector of values called pd as its input. This vector should turn into a [6x1] vector called pdot by adding three zeros to every element. Basically just resizing

from

to

it sounds rather simple but I can’t get it to work. The code that I use in my Simulink function block is shown below.

function pdot = fcn(pd)
pdot = zeros(6,1);
temp = zeros(6,1);
    for i = 1:length(pd)
    pdot(i) = temp(i) + [pd(i); 0; 0; 0];
    end
end

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Expert Answer

Neeta Dsouza answered . 2021–10–20 09:41:10

This seems like you maybe over complicated it? Is it as simple as…

x=[1;3;5]

x = 3×1

1 3 5

fcn(x)

ans = 6×1

1 3 5 0 0 0

function pdot = fcn(pd)
pdot=[pd;0;0;0];
end

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