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working with a vector

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Federico Paolucci
Federico Paolucci 2022-12-17
评论： Voss 2022-12-17
Hi, I'm dealing with a column vector with elements growing from top to bottom: I would like each element following the first to be subtracted from its previous one. Thanks for your suggestions

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Voss
Voss 2022-12-17
Ran in:
% a column vector:
x = [1;4;5;7;10]
x = 5×1
1 4 5 7 10
% one way:
diff(x)
ans = 4×1
3 1 2 3
% another way:
x(2:end)-x(1:end-1)
ans = 4×1
3 1 2 3
  2 个评论
Federico Paolucci
Federico Paolucci 2022-12-17
Thank you very much, i have another question: is there a way to maintain "1" as the first element of the new vector? in this case, I would obtain [1;3;1;2;3] from x = [1;4;5;7;10]
Voss
Voss 2022-12-17
Ran in:
You're welcome!
x = [1;4;5;7;10];
new_x = [x(1); diff(x)]
new_x = 5×1
1 3 1 2 3

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