matlab里面有个求最小值的函数min，具体用户可以查看帮助
在命令窗口输入help min就会列出一系列关于min的用法，不过全是英文
好好钻研吧
help min
MIN Smallest component.
For vectors, MIN(X) is the smallest element in X. For matrices,
MIN(X) is a row vector containing the minimum element from each
column. For N-D arrays, MIN(X) operates along the first
non-singleton dimension.
[Y,I] = MIN(X) returns the indices of the minimum values in vector I.
If the values along the first non-singleton dimension contain more
than one minimal element, the index of the first one is returned.
MIN(X,Y) returns an array the same size as X and Y with the
smallest elements taken from X or Y. Either one can be a scalar.
[Y,I] = MIN(X,[],DIM) operates along the dimension DIM.
When complex, the magnitude MIN(ABS(X)) is used, and the angle
ANGLE(X) is ignored. NaN's are ignored when computing the minimum.
Example: If X = [2 8 4 then min(X,[],1) is [2 3 4],
7 3 9]
min(X,[],2) is [2 and min(X,5) is [2 5 4
3], 5 3 5].
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