How do I create this sorting function?

Hi all. I am still a bit new to Matlab and I was asked to create a function with one input (X) and one output (Y) which ranks any set of numbers in such a way that for instance if X=[5 2 9 7], Y=[2 1 4 3]. This is to be done through the use of loops and logical operators. How would I go about doing this please? Thanks in advance.

Answer 1

[Dyuman Joshi]

For all unique values

input = [5 2 9 7];
output = sorting(input)

output = 1×4

2 1 4 3

function y = sorting(x)

for i=1:numel(x)
    y(i)=nnz(x(i)>=x); %you can use sum as well
end

end

[Nico Degabriele]

Thanks so much! However, is there a way to go around using numel and nnz please?

[Walter Roberson]

numel(x) is defined as the prod(size(x))

As @Dyuman Joshi indicates, you can use sum() instead of nnz()

[Walter Roberson]

Note: that sorting() function does not work if there are duplicate entries, and will return 0 for any entry that is NaN.