How do I create this sorting function?

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Nico Degabriele
Nico Degabriele 2022-5-3
编辑： Dyuman Joshi 2022-5-4
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.

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回答（1 个）

Dyuman Joshi
Dyuman Joshi 2022-5-3
编辑：Dyuman Joshi 2022-5-4
Ran in:
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
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Walter Roberson
Walter Roberson 2022-5-4
numel(x) is defined as the prod(size(x))
As @Dyuman Joshi indicates, you can use sum() instead of nnz()
Walter Roberson
Walter Roberson 2022-5-4
编辑：Walter Roberson 2022-5-4
Note: that sorting() function does not work if there are duplicate entries, and will return 0 for any entry that is NaN.

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