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Find minimum of $n$ first entries, with $1\leq n\leq numel(X)$.

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Bananach
Bananach 2016-9-19
关闭： MATLAB Answer Bot 2021-8-20
Given a one-dimensional array $X$, is there a fast way (faster than a for loop) to find $min_{1\leq m\leq n} X(m)$ for all $1\leq n\leq numel(X)$?
  2 个评论
Adam
Adam 2016-9-19
Can you give an example of what you are asking for? And preferably in words as semi-symbols are confusing!

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回答（2 个）

Mischa Kim
Mischa Kim 2016-9-19
Bananach, use min :
X = rand(1,10)
X =
0.6557 0.0357 0.8491 0.9340 0.6787 0.7577 0.7431 0.3922 0.6555 0.1712
min_X = min(X(1:6)) % find the minumum of the first 6 entries
min_X =
0.0357
  1 个评论
Bananach
Bananach 2016-9-19
I should have been more clear: I want a vector that contains the minimum for all possible values of 6 ;) That means, in your example, that I want a vector with 10 elements, with the entries $(min(X(1:j)))_{j=1}^10$
Adam
Adam 2016-9-19
编辑：Adam 2016-9-19
Y = cummin( X );
will do the job. There are a few in that family of functions that do cumulative analysis on a vector.

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