matlab中Max的用法

matlab中Max的用法

 (2011-09-14 16:24:01)

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分类： matlab学习

Matlab中max函数在矩阵中求函数大小的实例如下:

C = max(A)
返回一个数组各不同维中的最大元素。
如果A是一个向量，max(A)返回A中的最大元素。
如果A是一个矩阵，max(A)将A的每一列作为一个向量，返回一行向量包含了每一列的最大元素。
如果A是多为数组，max(A) treats the values along the first non-singleton dimension as vectors, returning the maximum value of each vector.

C = max(A,B)
返回一个和A和B同大小的数组，其中的元素是从A或B中取出的最大元素。

C = max(A,[],dim)
返回A中有dim指定的维数范围中的最大值。

[C,I] = max(...)
找到A中那些最大值的索引位置，将他们放在向量I中返回。如果这里有多个相同最大值时，返回的将是第一个的索引。

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max

Maximum elements of an array

Syntax

C = max(A)
C = max(A,B)
C = max(A,[],dim)
[C,I] = max(...)

Description

C = max(A) returns the largest elements along different dimensions of an array. If A is a vector, max(A) returns the largest element in A. If A is a matrix, max(A) treats the columns of A as vectors, returning a row vector containing the maximum element from each column. If A is a multidimensional array, max(A) treats the values along the first non-singleton dimension as vectors, returning the maximum value of each vector.

C = max(A,B) returns an array the same size as A and B with the largest elements taken from A or B.

C = max(A,[],dim) returns the largest elements along the dimension of A specified by scalar dim. For example, max(A,[],1) produces the maximum values along the first dimension (the rows) of A.

[C,I] = max(...) finds the indices of the maximum values of A, and returns them in output vector I. If there are several identical maximum values, the index of the first one found is returned.

Remarks

For complex input A, max returns the complex number with the largest complex modulus (magnitude), computed with max(abs(A)), and ignores the phase angle, angle(A). The max function ignores NaNs.

See Also