mreldif(X,Y) Description: the relative difference of X and Y Domain X: matrices Domain Y: matrices with same number of rows and columns as X Range: scalars -8e+307 to 8e+307
时间: 2023-05-21 14:05:52 浏览: 152
可以通过以下公式计算相对差异:
mreldif(X,Y) = ||X-Y||_F / max(||X||_F, ||Y||_F)
其中,||.||_F表示Frobenius范数,即每个矩阵中所有元素的平方和的平方根。当X和Y的所有元素都非常接近时,mreldif将趋近于0。当X和Y之间的差异非常大时,mreldif将趋近于1。
相关问题
X, Y, Z, and size arguments must be vectors of the same length, matrices of the same size, or a mix of vectors and matrices where the length of the vectors matches either the number of rows or columns of the matrices.
这个错误提示意味着在使用某个函数时,传入的参数X、Y、Z和size的长度或大小不匹配。根据错误信息,这些参数应该是向量或矩阵,并且它们的长度或大小应该相同。
解决这个问题的方法取决于具体的情况,以下是一些可能的解决方案:
1. 确保传入的参数是向量或矩阵:检查参数X、Y、Z和size是否是向量或矩阵类型。如果不是,请确保将它们转换为正确的类型。
2. 检查向量和矩阵的长度和大小:确保向量的长度相同,或者矩阵的行数或列数与向量的长度相匹配。
3. 检查参数的赋值方式:如果参数是手动赋值的,确保正确地为每个参数分配数值,并且它们的长度或大小相同。
4. 检查函数的使用方式:查阅相关函数的文档,确保正确理解并使用函数的参数。
如果以上方法仍未解决问题,请提供更多的上下文信息和相关代码,以便我能够更具体地帮助你解决这个问题。
翻译一下vertcat Vertical concatenation. [A;B] is the vertical concatenation of matrices A and B. A and B must have the same number of columns. Any number of matrices can be concatenated within one pair of brackets. Horizontal and vertical concatenation can be combined together as in [1 2;3 4]. [A B; C] is allowed if the number of rows of A equals the number of rows of B and the number of columns of A plus the number of columns of B equals the number of columns of C. The matrices in a concatenation expression can themselves by formed via a concatenation as in [A B;[C D]]. These rules generalize in a hopefully obvious way to allow fairly complicated constructions. N-D arrays are concatenated along the first dimension. The remaining dimensions must match. C = vertcat(A,B) is called for the syntax '[A; B]' when A or B is an object. Y = vertcat(X1,X2,X3,...) is called for the syntax '[X1; X2; X3; ...]' when any of X1, X2, X3, etc. is an object. See also horzcat, cat.
vertcat是指垂直拼接。[A;B]是将矩阵A和B垂直拼接在一起。A和B必须具有相同的列数。一对方括号内可以连接任意数量的矩阵。水平和垂直拼接可以组合在一起,如[1 2;3 4]。如果A的行数等于B的行数,并且A的列数加上B的列数等于C的列数,则允许[A B;C]。连接表达式中的矩阵本身可以通过连接形成,如[A B; [C D]]。这些规则以一种希望很明显的方式推广,以允许相当复杂的构造。N维数组沿第一维拼接。其余维度必须匹配。当A或B是对象时,调用C = vertcat(A,B)语法上的'[A;B]'。当X1、X2、X3等中的任何一个是对象时,调用Y = vertcat(X1,X2,X3,...)语法上的'[X1;X2;X3;...]'。另请参见horzcat、cat。
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