46 lines
848 B
Plaintext
46 lines
848 B
Plaintext
# Arrays are better called lists in GAP. Lists may have elements of mixed types, e$
|
|
v := [ 10, 7, "bob", true, [ "inner", 5 ] ];
|
|
# [ 10, 7, "bob", true, [ "inner", 5 ] ]
|
|
|
|
# List index runs from 1 to Size(v)
|
|
v[1];
|
|
# 10
|
|
|
|
v[0];
|
|
# error
|
|
|
|
v[5];
|
|
# [ "inner", 5 ]
|
|
|
|
v[6];
|
|
# error
|
|
|
|
# One can assign a value to an undefined element
|
|
v[6] := 100;
|
|
|
|
# Even if it's not after the last: a list may have undefined elements
|
|
v[10] := 1000;
|
|
v;
|
|
# [ 10, 7, "bob", true, [ "inner", 5 ], 100,,,, 1000 ]
|
|
|
|
# And one can check for defined values
|
|
IsBound(v[10]);
|
|
# true
|
|
|
|
IsBound(v[9]);
|
|
# false
|
|
|
|
# Size of the list
|
|
Size(v);
|
|
# 10
|
|
|
|
# Appending a list to the end of another
|
|
Append(v, [ 8, 9]);
|
|
v;
|
|
# [ 10, 7, "bob", true, [ "inner", 5 ], 100,,,, 1000, 8, 9 ]
|
|
|
|
# Adding an element at the end
|
|
Add(v, "added");
|
|
v;
|
|
# [ 10, 7, "bob", true, [ "inner", 5 ], 100,,,, 1000, 8, 9, "added" ]
|