• ← LoadModule
• → SetDelayed

Set (=)

WMA link

Set[expr, value]

expr = value

evaluates value and assigns it to expr.

{$s_1$, $s_2$, $s_3$} = {$v_1$, $v_2$, $v_3$}

sets multiple symbols ($s_1$, $s_2$, ...) to the corresponding values ($v_1$, $v_2$, ...).

Set can be used to give a symbol a value:

• • a = 3

• • a

An assignment like this creates an ownvalue:

• • OwnValues[a]

You can set multiple values at once using lists:

• • {a, b, c} = {10, 2, 3}

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

• • d

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

• • a

• • x = a

• • a = 2

• • x

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

• • a = b = c = 2;

• • a == b == c == 2

Set supports assignments to parts:

• • A = {{1, 2}, {3, 4}};

• • A[[1, 2]] = 5

• • A

• • A[[;;, 2]] = {6, 7}

• • A

Set a submatrix:

• • B = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

• • B[[1;;2, 2;;-1]] = {{t, u}, {y, z}};

• • B