Lowercase representation of a string.
Syntax: @lower(str)
str: string, alpha, svector
Return: string, alpha, svector
Returns the lowercase representation of the string str.
Lower triangular matrix of a matrix.
Syntax: @lower(m[, n])
m: matrix, sym
n (optional) integer
Return: matrix
Returns a matrix whose elements on and below the n-th diagonal match the corresponding elements of the matrix m, but whose elements above the n-th diagonal are zero.
By default, n is has a value of zero, indicating the main diagonal. Positive values of n indicate super-diagonals, while negative values of k indicate sub-diagonals.
Examples
String
If we define the string object
string s1 = "I did NOT do it"
the commands
@lower("I did NOT do it")
@lower(s1)
return the string “i did not do it”.
If ALPHA1 is an alpha series,
alpha alphalwr = @lower(alpha1)
returns the lowercase of the strings in ALPHA1 for each observation in the workfile sample.
If SVEC1 is an string vector,
svector sveclen = @lower(svec1)
returns a string vector containing the lowercased elements of SVEC1.
Matrix
The commands
matrix(3,3) m1
m1.fill 1, 2, 3, 4, 5, 6, 7, 8, 9
matrix l1 = @lower(m1)
matrix l2 = @lower(m1, 1)
matrix l3 = @lower(m1, -1)
create a
matrix M1
the matrix L1 containing,
the matrix L2 containing,
and the matrix L3 containing
If we have the commands,
sym s = @rwish(@identity(5), 5)
matrix s1 = @lower(s)
matrix s2 = @lower(s, -1)
then S is a
sym matrix and S1 is a
lower triangular matrix with elements at or below the main diagonal equal to those in S, and elements below the main diagonal equal to zero. S2 is a strictly lower triangular matrix that is equal to S1, but with the main diagonal elements also set to 0.
Cross-references
