Set

Set(expr, value)

expr = value

evaluates value and assigns it to expr.

{s1, s2, s3} = {v1, v2, v3}

sets multiple symbols (s1, s2, ...) to the corresponding values (v1, v2, ...).

Set can be used to give a symbol a value:

>> a = 3
3

>> a
3

You can set multiple values at once using lists:

>> {a, b, c} = {10, 2, 3}
{10,2,3}

>> {a, b, {c, {d}}} = {1, 2, {{c1, c2}, {a}}}
{1,2,{{c1,c2},{10}}}

>> d
10

Set evaluates its right-hand side immediately and assigns it to the left-hand side:

>> a
1

>> x = a
1

>> a = 2
2

>> x
1

‘Set’ always returns the right-hand side, which you can again use in an assignment:

>> a = b = c = 2
>> a == b == c == 2
True

‘Set’ supports assignments to parts:

>> A = {{1, 2}, {3, 4}}
>> A[[1, 2]] = 5
5

>> A
{{1,5}, {3,4}}

>> A[[;;, 2]] = {6, 7}
{6,7}

>> A
{{1,6},{3,7}}

Set a submatrix:

>> B = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}
>> B[[1;;2, 2;;-1]] = {{t, u}, {y, z}}
>> B
{{1, t, u}, {4, y, z}, {7, 8, 9}}