How to find highest and lowest numbers in vector without using build in functions?

I have a task to find highest and lowest numbers in vectros using while and if

Any help would mean a lot to me since I'm only a begginer and have no Idea how to do this

Answer 1

[Walter Roberson]

That cannot be done. See https://www.mathworks.com/matlabcentral/answers/38787-what-can-be-programmed-without-any-built-in-functions?s_tid=srchtitle

Both while and if are keywords rather than functions, so saying that those are permitted to be used does not alter what can be done without functions.

In short: in order to compare numbers to each other you have to do a computation (checking to see if they are equal, at the very least), and all computation involving two numbers in MATLAB involves using built-in functions, but you are not permitted to use built-in functions.

Example:

A = 3;   %does not involve any functions
if A == 1    %involves the function eq()
elseif A < 3  %involves the function le()
end

So you cannot compare x(1) to x(2) without using a comparison and that involves using a built-in function.

There are computer languages where comparisons and very simple indexing are both built-in operators, and with those languages it is technically possible to sort a fixed-length vector without using any built-in functions... but it might be very tedious. And those languages are not MATLAB.