erase!

Syntax

erase!(obj, key|filter)

Arguments

obj is a set/dictionary/table.

key|filter for a set, it is the elements to be deleted; for a dictionary, it is the keys of the members to be deleted; for a table, it is a piece of meta code with filtering conditions. For details about meta code, please refer to Metaprogramming.

Details

Eliminate elements from a set, or members from a dictionary, or rows from a table.

Examples

On a set:

$ y=set(8 9 4 6);
$ y;
set(6,4,9,8)
$ y.erase!(6);
set(4,9,8)
$ erase!(y, 9 8);
set(4)

On a dictionary:

$ x=1..6;
$ y=11..16;
$ z=dict(x,y);
$ z;
6->16
5->15
4->14
3->13
2->12
1->11

$ erase!(z, 1..4);
6->16
5->15

On a table:

$ x=1..10;
$ y=11..20;
$ t=table(x,y);

$ erase!(t, <x<=3>);

x	y
4	14
5	15
6	16
7	17
8	18
9	19
10	20

$ erase!(t, <x<=9 and y>=15>);

x	y
4	14
10	20