Popular Functions in IML

Things under legendu.net/outdated are outdated technologies that the author does not plan to update any more. Please look for better alternatives.

** Things under legendu.net/outdated are outdated technologies that the author does not plan to update any more. Please look for better alternatives. **

dif: lagged difference, keep missing values, may or may not what you want, can use negative lag, always return a matrix, with columns corresponding to differences of specified lags if only 1 lag is specified, return a matrix with 1 column.

lag: the usage is similar to dif

the dif<n> and lag<n> are for the data steps

loc equivalence of which in R

j

repeat REPEAT Function Returns a character value that consists of the first argument repeated n+1 times.

colvec rowvec

shape SHAPE Function SHAPE (matrix, nrow <, ncol> <, pad-value> ) ; The SHAPE function reshapes and repeats values in a matrix.

choose, kind of like ifelse in R

cuSum

cuProd

diag

sample (x <, n> <, method> <, prob> ) ;

ssq

shape for numeric

cshape for character

concat like paste in R

change like replace

qntl Call for sample quantile

quantile

corr

standard

var

mean

mod

EXPANDGRID Function EXPANDGRID (x1, x2 <, x3> …<, x15>) ; The EXPANDGRID function is part of the IMLMLIB library. The arguments to the EXPANDGRID function are \(k\) vectors, \(2 \leq k \leq 15\). The EXPANDGRID function returns a matrix that contains the Cartesian product of elements from the specified vectors. If the \(i\)th argument has \(n_ i\) elements, the return matrix has \(\Pi _{i\leq k}n_ i\) rows and \(k\) columns.

ROWVEC Function ROWVEC (matrix) ;

SHAPECOL Function SHAPECOL (matrix, nrow <, ncol> <, pad-value> ) ; The SHAPECOL function reshapes and repeats values in a matrix. It is similar to the SHAPE function except that the SHAPECOL function produces the result matrix by traversing the argument matrix in column-major order.

String

strip works both in the data step and the iml procedure