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# How to Matching matrix size (add or take away a value)

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Drew Eager on 31 Jul 2021
Answered: KSSV on 31 Jul 2021
Hi everyone,
I want to take the results from vx and then apply them to the find ax, but the matrix are different sizes so I am reciving an error. Is the a away to rectify this so i can use the reulting vx matric for the ax eqaution? I cannot figure out how to match the size.
Thanks
Here is the code I am working with.
% x values of particle 1
x = [2.1547 2.1104 2.0498 1.9743 1.8852 1.7843];
% t values of particle 1
t = [0.1346 0.2015 0.2682 0.3345 0.4006 0.4665];
% difference
dx = diff(x);
dt = diff(t);
% vx - velocity in x direction
vx = dx./dt;
% ax - acceleration in x direction
ax = vx./dt;
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### Answers (1)

KSSV on 31 Jul 2021
There is no error... If you are finding the difference, have a look on gradient.
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