Matlab separate output into 2 variables

Question

I have two float variables:

x = 0.5;
y = 1.5;

I would like to floor them:

x = floor(x);
y = floor(y);

Can i do it in a single command? this raises an error:

[x y] = floor([x y]);

Answer 1

You can write your own wrapper for floor:

function varargout = myFloor(varargin)
for k = 1:nargin
    varargout{k} = floor(varargin{k});
end

This function shows the required behavior if you provide x and y as two separated arguments

[a, b] = myFloor(x,y)

This results in

a =

     0


b =

     1

If you want to use the concatenated array [x y] as input (like in your example) you can use the following function:

function varargout = myFloor(x)
for k = 1:numel(x)
    varargout{k} = floor(x(k));
end

Then you would call

[a, b] = myFloor([x y])

This results in

a =

     0


b =

     1

Answer 2

Just adding a random idea here...

Building on H.Muster solution, you might want to define a personalized deal function, which is like deal but also applies a function to each argument:

function varargout = myDeal(fun, varargin)
    if nargin == 2
        varargout(1:nargout) = {feval(fun, varargin{1})};
    elseif nargin-1 == nargout
        for k = 1:nargout
            varargout{k} = feval(fun, varargin{k}); end
    else
        error('Argument count mismatch.');
    end
end

This way, you can multi-assign any function:

>> [x,y,z] = myDeal(@floor, 0.5, 0.6, 2.7)
x =
     0
y =
     0
z =
     2

>>  [x,y,z] = myDeal(@sin, pi/6)
x =
     4.999999999999999e-01
y =
     4.999999999999999e-01
z =
     4.999999999999999e-01

>> [a, b] = myDeal(@fix, 10*rand(2), 8*rand(5))         
a =
     7     2
     7     6
b =
     5     2     4     1     6
     1     4     5     1     1
     0     1     7     2     7
     3     6     7     6     2
     7     2     4     2     1