if (FALSE) {
# R base operation
atan(0)
atan(-1)
# LazyTensor symbolic element-wise arc-tangent
x <- matrix(runif(150 * 3), 150, 3) # arbitrary R matrix, 150 rows, 3 columns
x_i <- LazyTensor(x, index = 'i') # creating LazyTensor from matrix x,
# indexed by 'i'
Atan_x <- atan(x_i) # symbolic matrix, 150 rows and 3 columns
}
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