用R上的条件创建一个矩阵

# 创建一个空的矩阵
matrix <- matrix()

# 定义条件
condition <- TRUE

# 使用条件语句创建矩阵
if (condition) {
  matrix <- matrix(1:9, nrow = 3, ncol = 3)
} else {
  matrix <- matrix(9:1, nrow = 3, ncol = 3)
}

# 打印矩阵
print(matrix)

# 创建一个空的矩阵
matrix <- matrix()

# 定义条件
condition <- "A"

# 使用条件语句创建矩阵
switch(condition,
       "A" = {matrix <- matrix(1:9, nrow = 3, ncol = 3)},
       "B" = {matrix <- matrix(9:1, nrow = 3, ncol = 3)},
       "C" = {matrix <- matrix(rep(0, 9), nrow = 3, ncol = 3)}
)

# 打印矩阵
print(matrix)