matlab中any 函数的作用是什么了？ 【matlab】只有5行程序。函数中any的用法：： els...
matlab\u4e2dany \u51fd\u6570\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\u4e86ANY True if any element of a vector is a nonzero number or is logical 1 (TRUE). ANY ignores entries that are NaN (Not a Number).\u5224\u65ad\u5411\u91cf\u4e2d\u662f\u5426\u5b58\u5728\u975e\u96f6\u5143\u7d20\uff0c\u82e5\u5b58\u5728\u8fd4\u56de1\uff0c\u5426\u5219\u8fd4\u56de0\uff08\u5ffd\u7565NaN\u5143\u7d20\uff09\u3002
any([0 1]) % \u4e3a\u771f\uff0c\u5b58\u5728\u975e\u96f6\u5143any([0 0]) % \u4e3a\u5047
1\u3001[0,1]==n\u8868\u793a\u628a[0 1]\u77e9\u9635\u4e2d\u6bcf\u4e2a\u5143\u7d20\u548cn\u6bd4\u8f83\uff0c\u76f8\u7b49\u8fd4\u56de1\uff0c\u5426\u52190\uff0c\u4f8b\u5982\uff1a
n=1\u65f6\uff0c[0,1]==n\u8fd4\u56de [0 1]
n=0\u65f6\uff0c[0,1]==n\u8fd4\u56de [1 0]
2\u3001Matlab\u4e2d\u540c\u6837\u7528return\u7ed9\u8fd4\u56de\u503c\u8d4b\u503c\uff0c\u4f8b\u5982\u4f60\u8fd9\u4e2a\u4f8b\u5b50\uff0c\u6700\u540e return k
matlab函数any用法例解：B=any(A)，如果A是向量，如果向量里有非0的数，则返回1（true），如果A是矩阵，则把矩阵的列当做向量来处理，函数返回每个列向量的逻辑值；B=any(A,dim)测试由dim表示的A的维度，返回相应逻辑值应用实例例1A=[0.530.670.010.380.070.420.69]thenB=(A<0.5)returnslogical1(true)only
判断元素是否为非零元素any(v),如果v是非零元素返回true(即1)否则返回flase(即0)
any：当向量中的元素有非零元素时返回值为1
any（A,1）:表示矩阵A的列向量判断
any（A,2）:表示矩阵A的行向量判断
any
Determine whether any array elements are nonzero
Syntax
B = any(A)
B = any(A,dim)
Description
B = any(A) tests whether any of the elements along various dimensions of an array is a nonzero number or is logical 1 (true). any ignores entries that are NaN (Not a Number).
If A is a vector, any(A) returns logical 1 (true) if any of the elements of A is a nonzero number or is logical 1 (true), and returns logical 0 (false) if all the elements are zero.
If A is a matrix, any(A) treats the columns of A as vectors, returning a row vector of logical 1's and 0's.
If A is a multidimensional array, any(A) treats the values along the first nonsingleton dimension as vectors, returning a logical condition for each vector.
B = any(A,dim) tests along the dimension of A specified by scalar dim.
就是B = any(A)，如果A是向量，如果向量里有非0的数，则返回1（true），如果A是矩阵，则把矩阵的列当做向量来处理，函数返回每个列向量的逻辑值；
B = any(A,dim)测试由dim表示的A的维度，返回相应逻辑值
Examples
Example 1 – Reducing a Logical Vector to a Scalar Condition
Given
A = [0.53 0.67 0.01 0.38 0.07 0.42 0.69]
then B = (A < 0.5) returns logical 1 (true) only where A is less than one half:
0 0 1 1 1 1 0
The any function reduces such a vector of logical conditions to a single condition. In this case, any(B) yields logical 1.
This makes any particularly useful in if statements:
if any(A < 0.5)do something
end
where code is executed depending on a single condition, not a vector of possibly conflicting conditions.
Example 2– Reducing a Logical Matrix to a Scalar Condition
Applying the any function twice to a matrix, as in any(any(A)), always reduces it to a scalar condition.
any(any(eye(3)))
ans =
1
Example 3 – Testing Arrays of Any Dimension
You can use the following type of statement on an array of any dimensions. This example tests a 3-D array to see if any of its elements are greater than 3:
x = rand(3,7,5) * 5;
any(x(:) > 3)
ans =
1
or less than zero:
any(x(:) < 0)
ans =
0
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