R语言解线性方程组和求极值?

Question

R语言解线性方程组和求极值

Answer 1

1、R语言矩阵函数t(x) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 转置diag(x) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;对角阵x %*% y &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;矩阵运算solve(a,b) &nbsp; &nbsp; &nbsp; 运算a%*%x=b得到xsolve(a) &nbsp; &nbsp; &nbsp; &nbsp; 矩阵的逆rowsum(x) &nbsp; &nbsp; &nbsp; &nbsp;行加和colsum(x) &nbsp; &nbsp; &nbsp; &nbsp;列加和rowMeans(x) &nbsp; &nbsp; &nbsp;行平均colMeans(x) &nbsp; &nbsp; &nbsp;列平均2、求解线性方程组分析：使用函数solve(a,b)，运算a%*%x=b得到x。a<-matrix(c(1,1,1,-1),2,2);b<-c(3,1);solve(a,b)运行结果> a<-matrix(c(1,1,1,-1),2,2);b<-c(3,1);solve(a,b)[1] 2 1a<-matrix(c(1,1,1,-1),2,2);b<-c(3,1);solve(a,b)运行结果> a<-matrix(c(1,1,1,-1),2,2);b<-c(3,1);solve(a,b)[1] 2 1注：这里矩阵a从数组读数是按照列读数