matrix(data=NA, nrow=1, ncol=1,byrow=FALSE, dimnames = list( char_vector_rownames, char_vector_colnames) 如: 创建一个2行3列的矩阵 > wen<-matrix(1:6,nrow = 2)#设定2行,自动计算出3列,默认按列填充。 > wen [,1] [,2] [,3] [1,] 1 3 5 [2,] 2 4 6 > wen<-matrix(1:...
In R, a matrix is a collection of elements of the same data type (numeric, character, or logical) arranged into a fixed number of rows and columns. Since you are only working with rows and columns, a matrix is called two-dimensional(二维). You can construct a matrix in R with themat...
Matrices and Data Frame 简单的讲,给atomic vector加上维度信息,它就变成了数组array。如果维度信息是二维的,它就是matrix。也就是说,matrix只是array的一个特例,而array是从atomic vector扩展而来的。 让我们创建一个matrix #利用matrix()函数构建矩阵 a <- 1:12 mat <- matrix(a, ncol=3, nrow=4) ##nc...
Thers_matrix()function can now be used to produce a function that constructs these matrices. #Calculate matricesmatrix_constructor<-with(sales, rs_matrix(date,date_prev,price,price_prev))matrices<-sapply(c("Z","X","y","Y"),matrix_constructor)matrices$Z ...
# Create two 2x3 matrices. matrix1 <- matrix(c(3, 9, -1, 4, 2, 6), nrow=2) print(matrix1) matrix2 <- matrix(c(5, 2, 0, 9, 3, 4), nrow=2) print(matrix2) # Add the matrices. result <- matrix1 + matrix2 cat("Result of addition","\n") ...
摘要: ew extend the result in [13] to those for the quantization of generalized kac-Moody algebras introduced in [10]. The existence of the universal R-matrix is proved, and a structure theorem for the center is given.DOI: 10.32917/HMJ/1206127050 年份: 1997 ...
is.matrix() as.matrix() #矩阵 is.data.frame() as.data.frame() #数据框 is.factor() as.factor() #因子 is.logical() as.logical()#逻辑数据 以上每一行的两个函数都是定义相同类型的函数 a<-c(1,2,3);a[1]123is.numeric(a)[1]TRUEis.vector(a)[1]TRUEa<-as.character(a)#将a转化为...
Using Uh(so(4))=Uh(sl(2)) u2295 Uu2212h(sl(2)), we obtain the universal R-matrix for Uh(so(4)). Applying the graded contractions on the universal R-matrix of Uh(so(4)), we show that there exist three distinct R-matrices for all the contracted algebras. It is shown that Uh...
RCampus Matrices are completely customizable through the user-interface, and can be used to collect documents, evaluate them using rubrics, and analyze the work. Results of Matrix assessments can be used for reporting purposes as well as to support the enhancement of specific initiatives. ...
We give a new construction of r-matrices via a generalised complexification and derive a non-linear set of matrix equations determining the most general compatible r-matrix. We exhibit new families of solutions and show that they contain known solutions for special parameter values 展开 ...