set order of elseif
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I have this code structure inside a loop. x, y and z are 1/0 variables. In this case the order of the elseif statement is: first x is evaluated, then y then z
if x
%code for case x
elseif y
%code for case y
elseif z
%code for case z
end
I would like to define a varible order (for the previous case order={'caseX','caseY','caseZ'}), where I can change the order in which the elseif statement is evaluated. So if I set order={'caseZ','caseX','caseY'}, I should get this: (first z is evaluated, then x then y)
order={'caseZ','caseX','caseY'}
%%% then
if z
%code for case z
elseif x
%code for case x
elseif y
%code for case y
end
An hint will be appreciated.
2 Comments
Accepted Answer
James Tursa
on 17 Dec 2020
Edited: James Tursa
on 17 Dec 2020
Does this do what you want:
order = [1 2 3]; % or whatever
for k=1:numel(order)
switch order(k)
case 1
if( x )
% code for case x
break;
end
case 2
if( y )
% code for case y
break;
end
case 3
if( z )
% code for case z
break;
end
end
Or if you prefer the case selection could be for characters 'x', 'y', and 'z' instead of numbers 1, 2, 3.
The key is to have those break statements inside the cases so that the if-elseif-elseif control structure is emulated properly.
9 Comments
More Answers (2)
Bruno Luong
on 17 Dec 2020
prefered_order = 'xzy';
b = [x y z]; % logical conditions (in if/elseif)
code_to_be_exec = { @xcode, @ycode, @zcode }; % code in the if elseif block put in functions
[~,i] = ismember(prefered_order, 'xyz');
j = find(b(i), 1, 'first');
if ~isempty(j)
feval(code_to_be_exec{i(j)});
end
2 Comments
Bruno Luong
on 17 Dec 2020
Edited: Bruno Luong
on 17 Dec 2020
Of course, unroll all 6 possible permutations
if strcmp(prefered_order, 'xyz')
% your original if/else
elseif strcmp(prefered_order, 'yxz')
% another order...
elseif strcmp(prefered_order, 'zyx')
....
end
KSSV
on 17 Dec 2020
Are you looking something like this.
if z
%code for case z
order = ['case','z'] ;
elseif x
%code for case x
order = ['case','x'] ;
elseif y
%code for case y
order = ['case','y'] ;
end
3 Comments
KSSV
on 17 Dec 2020
order = 'z'
if strcmpi(order,'z')
%code for case z
order = ['case','z'] ;
elseif strcmpi(order,'x')
%code for case x
order = ['case','x'] ;
elseif strcmpi(order,'y')
%code for case y
order = ['case','y'] ;
end
Also have a look on switch.
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