Choose the lowest value and jump into the correct if

I got variables like:

A = 1;
B = 2;
C = 3;

those values are random and can change over time. I want to jump into the correct area in the if-statements (or case switch) for the lowest value of A,B,C. Something like

if lowest(A,{A,B,C})
    do_something_A = true;
elseif lowest(B,{A,B,C})
    do_something_B = true;
elseif lowest(C,{A,B,C})
    do_something_C = true;
end

This is a "self-invented" function, but hope you get my point

Answer 1

[Chunru]

A=1; B=2; C=3;
z = [A, B, C];      % put variables in a vector
[~, idx] = min(z);  % idx tells which variable is the minimum

% Then you can use idx to control what you want to do.
% As an example, you can use switch.
switch idx
    case 1  % A is minimum
        fprintf('A is the smallest')
    case 2
        fprintf('B is the smallest')
    case 3
        fprintf('C is the smallest')
end

A is the smallest

Answer 2

[Jonas]

use something like

[~,idx]=min([A B C]);

if idx==1 % A smallest

elseif idx==2 % B smallest

else % C snallest

end