[求助]问个有关取最小值的问题~ - MATLAB爱好者论坛-LabFans.com

dale516 · 2008-05-23, 13:28

呃...问个很弱智的问题~
比如:已知X10,X11,X12,X20,X21,X22,X30,X31,X32九个变量的经过计算得到的具体数值，
然后有行矩阵A,矩阵中的元素是由以上9个变量中的任意3个取最小值，进行排列组合出的1x27的行矩阵。
问题，matlab里有没有指令，可以直接比较三个变量的最小值并输出...我拿C里的循环嵌套，3个一组比较的...实在很崩溃~:ft:
:lovely: 希望达人指点，表嘲笑我啊~我是需要时才现学的菜鸟...先谢谢了！~

Just For Matlab · 2008-05-23, 20:37

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].

2008-05-23, 13:28	#1
dale516 初级会员注册日期: 2008-05-23 年龄: 40 帖子: 1 声望力: 0	[求助]问个有关取最小值的问题~ 呃...问个很弱智的问题~ 比如:已知X10,X11,X12,X20,X21,X22,X30,X31,X32九个变量的经过计算得到的具体数值，然后有行矩阵A,矩阵中的元素是由以上9个变量中的任意3个取最小值，进行排列组合出的1x27的行矩阵。问题，matlab里有没有指令，可以直接比较三个变量的最小值并输出...我拿C里的循环嵌套，3个一组比较的...实在很崩溃~:ft: :lovely: 希望达人指点，表嘲笑我啊~我是需要时才现学的菜鸟...先谢谢了！~

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2008-05-23, 20:37	#2
Just For Matlab 初级会员注册日期: 2008-05-23 年龄: 39 帖子: 5 声望力: 0	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].