identity

Builtin index · Core maths

result = eye(n)

Input: n · Output: result

What it is

The n×n identity matrix (ones on the diagonal, zeros elsewhere). n is a single non-negative integer. identity is an alias for eye.

Overloads

One call shape — this function is not overloaded.

Examples

From the documentation, and run by the build -- the output and the figure below are what the engine actually produced. Simplest first.

A = [1, 2, 3; 4, 5, 6]
print("size={size(A)}  numel={numel(A)}")
print(eye(3))
print(identity(2))
p = [1, 2]
q = [3, 4]
print(cat(1, p, q))   # vertical: stacks rows

print(cat(2, p, q))   # horizontal: concatenates

size=[2, 3]  numel=6
[1, 0, 0; 0, 1, 0; 0, 0, 1]
[1, 0; 0, 1]
[1, 2; 3, 4]
[1, 2, 3, 4]

from core-math

See also

eye — documented in the same entry.