slice

Syntax

slice(obj, index)

or

slice(obj, rowIndex, [colIndex])

which is equivalent to

obj[index] or obj[rowIndex, colIndex]

Arguments

obj can be a matrix or a table.

index, rowIndex and colIndex can be scalar/vector/pair indicating the row or column index. If index, rowIndex or colIndex is a pair, it indicates the range of index which is left-closed and right-open.

Details

For slice(obj, index):

• If obj is a matrix and

  • index is a scalar, it returns a vector indicating a column.

  • index is a vector or a pair, it returns a matrix of selected columns.

• If obj is a table and

  • index is a scalar, it returns a dictionary indicating a row.

  • index is a vector or a pair, it returns a table of selected rows.

For slice(obj, rowIndex, [colIndex]):

• If obj is a matrix and

  • rowIndex and colIndex are both scalars, it returns a scalar indicating the value of specified element of the matrix.

  • rowIndex is a scalar and colIndex is a pair (or vise versa), it returns a submatrix of selected rows and columns.

  • rowIndex and colIndex are both vectors or pairs, it returns a submatrix of selected rows and columns.

• If obj is a table and

  • rowIndex and colIndex are both scalars, return a scalar indicating the value of specified element of the table.

  • rowIndex is a scalar and colIndex is a pair (or vise versa), it returns a table of selected rows and columns.

  • rowIndex and colIndex are both vectors or pairs, it returns a table of selected rows and columns.

Examples

If obj is a matrix:

m=1..9$3:3
m.slice(0);
// output
[1,2,3]
    
m.slice([0]);

m.slice(0:2);

m.slice(0 2);

m.slice(0,1);
// output
 4

m.slice(0 1,0 1);

m.slice(1:2,1:2);

If obj is a table:

t=table(`A`B`C as sym,2018.01.01..2018.01.03 as date,10 48 5 as val)
t.slice(0);
// output
val->10
date->2018.01.01
sym->A
t.slice([0]);

t.slice(0 1);

t.slice(0:1);

t.slice(0,1);
// output
2018.01.01
 
t.slice(0 1,0 1);

t.slice(1:2,1:2);