How can I decrease the running time of this code?

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evelyn parra
evelyn parra 2019-4-14
回答： Star Strider 2019-4-14
for i=1:1:f-1
Ux(i,:)=X(i+1,:)-X(i,:)
Uy(i,:)=Y(i+1,:)-Y(i,:)
Uz(i,:)=Z(i+1,:)-Z(i,:)
end

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回答（1 个）

Star Strider
Star Strider 2019-4-14
Use the diff (link) function:
Ux = diff(X);
Uy = diff(Y);
Uz = diff(Z);
When I timed your code and diff with these matrices:
f = 1000;
X = rand(f, 500);
Y = rand(f, 500);
Z = rand(f, 500);
the results were:
Elapsed time is 0.633127 seconds. % Your Code
Elapsed time is 0.007197 seconds. % ‘diff’
The resulting matrices were the same.
Experiment to get the result you want.

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