深圳网站系统找哪里,购物网站有哪些,企业网站优化推广,河北关键词排名推广MATLAB中求矩阵非零元的坐标#xff1a; 方法1#xff1a; indexfind(a);
[i,j]ind2sub(size(a),index);
disp([i,j])方法2#xff1a; [i,j]find(a0|a0) %列出所有非零元的坐标
[i,j]find(ak) %找出等于k值的矩阵元素的坐标所用函数简介#xff1a; IND2SUB Mult…MATLAB中求矩阵非零元的坐标 方法1 indexfind(a);
[i,j]ind2sub(size(a),index);
disp([i,j])方法2 [i,j]find(a0|a0) %列出所有非零元的坐标
[i,j]find(ak) %找出等于k值的矩阵元素的坐标所用函数简介 IND2SUB Multiple subscripts from linear index. IND2SUB is used to determine the equivalent subscript values corresponding to a given single index into an array. [I,J] IND2SUB(SIZ,IND) returns the arrays I and J containing the equivalent row and column subscripts corresponding to the index matrix IND for a matrix of size SIZ. For matrices, [I,J] IND2SUB(SIZE(A),FIND(A5)) returns the same values as [I,J] FIND(A5). [I1,I2,I3,...,In] IND2SUB(SIZ,IND) returns N subscript arrays I1,I2,..,In containing the equivalent N-D array subscripts equivalent to IND for an array of size SIZ. Class support for input IND: float: double, single See also sub2ind, find. FIND Find indices of nonzero elements. I FIND(X) returns the linear indices corresponding to the nonzero entries of the array X. X may be a logical expression. Use IND2SUB(SIZE(X),I) to calculate multiple subscripts from the linear indices I. I FIND(X,K) returns at most the first K indices corresponding to the nonzero entries of the array X. K must be a positive integer, but can be of any numeric type. I FIND(X,K,first) is the same as I FIND(X,K). I FIND(X,K,last) returns at most the last K indices corresponding to the nonzero entries of the array X. [I,J] FIND(X,...) returns the row and column indices instead of linear indices into X. This syntax is especially useful when working with sparse matrices. If X is an N-dimensional array where N 2, then J is a linear index over the N-1 trailing dimensions of X. [I,J,V] FIND(X,...) also returns a vector V containing the values that correspond to the row and column indices I and J. Example: A magic(3) find(A 5) finds the linear indices of the 4 entries of the matrix A that are greater than 5. [rows,cols,vals] find(speye(5)) finds the row and column indices and nonzero values of the 5-by-5 sparse identity matrix. See also sparse, ind2sub, relop, nonzeros. Overloaded methods: codistributed/find SUB2IND Linear index from multiple subscripts. SUB2IND is used to determine the equivalent single index corresponding to a given set of subscript values. IND SUB2IND(SIZ,I,J) returns the linear index equivalent to the row and column subscripts in the arrays I and J for a matrix of size SIZ. IND SUB2IND(SIZ,I1,I2,...,IN) returns the linear index equivalent to the N subscripts in the arrays I1,I2,...,IN for an array of size SIZ. I1,I2,...,IN must have the same size, and IND will have the same size as I1,I2,...,IN. For an array A, if IND SUB2IND(SIZE(A),I1,...,IN)), then A(IND(k))A(I1(k),...,IN(k)) for all k. Class support for inputs I,J: float: double, single See also ind2sub. 来自http://zhidao.baidu.com/link?urlimuLeLDv16Bsg-xcu4O1M8hVzjdCiRfq6PYHu4MR-o1q9AeMWy-UM3AdZTA7av9k1WLExeyYPVDumS46TNNr1q
