Ranging operator. Addresses all elements along an array dimension or of a list.
Colon symbol :
can be used to form implicit
vectors (see also linspace, logspace) :
is the vector [j, j+1,...,k]
(empty if
j>k
);
is the vector [j, j+d, ..., j+m*d]
.
The colon notation can also be used to pick out selected rows, columns and elements of vectors and other arrays (see also extraction, insertion):
is the vector of all the elements of A
regarded as a single column;
is the j
-th column of A
;
is the i
-th row of A
;
is [A(j),A(j+1),...,A(k)]
;
is
[A(1,j) A(1,j+1) ... A(1,k) A(2,j) A(2,j+1) ... A(2,k) . . . . . . . . . . . A(M,j) A(M,j+1) ... A(M,k)] | ![]() | ![]() |
A
is M
-by-N
;is
[A(j,1) A(j,2) ... A(j,N) A(j+1,1) A(j+1,2) ... A(j+1,N) . . . . . . . . . . . A(k,1) A(k,2) ... A(k,N)] | ![]() | ![]() |
A
is M
-by-N
;fills the array A
with entries of w
(taken column by column if w
is a 2D array). The amount of
entries of A
must be equal to the amount of
entries of w
.
Please note that even if i
, j
,
k
or d
have a decimal part, only
the integer part will be used.
![]() | type(:) is 129.
typeof(:) is "implicitlist" . |
a = 1:5 b = 1:3:12 A = matrix(1:42,7,6); // vector of all the elements of A A(:) // the j-th column of A A(:,j) // the i-th row of A A(i,:) // elements of columns from j to k and all rows A(:,j:k) // elements of all columns and rows from j to k A(j:k,:) w = matrix(101:142,7,6); A(:) = w // if indices are not integer i = 1:0.4:10; //indices A(i) | ![]() | ![]() |
Version | Description |
6.0 |
|