Can I use unary coding to convert a vector of decimals into a binary matrix?

I am trying to convert a decimal vector into a matrix of binary numbers using unary coding. For example:

1 -> 1 0 0 0
2 -> 0 1 0 0
3 -> 0 0 1 0
4 -> 0 0 0 1

I'd like to do this using vector arithmetic, not looping over all of the rows.

[Walter Roberson]

There are multiple competing stands for unary coding. Which one are you following? How are you representing 0? How are you representing negative numbers? Do you need to represent fractions?

Answer 1

[Jan]

d = 1:4;
n = length(d);
m = max(d);
u = [];
u(sub2ind([n, m], 1:n, d)) = 1;

[Rashid]

thanks :)