How do I create a function that accepts a 3 element vector as input, but returns scalar values?

2016 11 22
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更新时间：2016 11 22
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I need to create a function that sorts the order of a vector elements and returns it as scalar values.

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James Tursa
James Tursa 2016-11-22
Please give an example of an input vector and desired output.
AP720
AP720 2016-11-22
[1 2 3] as input (how do you command this input?) and scalar values 1 2 3 as output (how do you distinguish that from the original vector?)
AP720
AP720 2016-11-22
I feel like I need to be using nargin or varargin but am unsure how to implement them, and the ways I've tried haven't worked.

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James Tursa
James Tursa 2016-11-22

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If I understand you correctly, here is an outline of such a function (in a file called sort3.m):
% Filename sort3.m
function [a,b,c] = sort3(x)
% your code for sorting goes here
a = whatever
b = whatever
c = whatever
end
You need to fill in the actual sorting code.

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AP720
AP720 2016-11-22
编辑：James Tursa 2016-11-22
Thank-you. I edited my code to the following but it's still not working:
function [x,y,z] = sort3(t)
if x<=y && y<=z
t = [x y z];
elseif x>=y && y>=z
t = [z y x];
elseif x<=y && y>=z && x<=z
t = [x z y];
elseif y>=z && x<=y
t = [z x y];
elseif y<=x && x<=z
t= [y x z];
elseif y<=x && z<=x
t = [y z x];
end
end
James Tursa
James Tursa 2016-11-22
Your code is written backwards. The variable t is the input, so you need to work with t(1), t(2), and t(3). Your code should be comparing these values and then assigning the output to x, y, and z, not the other way around. E.g.,
if t(1) <= t(2) && t(2) <= t(3)
x = t(1);
y = t(2);
z = t(3);
etc.
AP720
AP720 2016-11-22
I had a feeling I was making a silly mistake...it worked, thank-you!

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