Does matlab have any function that can compare multiple numbers and return logical value zero or one?

I need to find a matlab function that does this:

F(2,3,4)=0
F(2,2,2)=1
F(5,6,7,8,9,2)=0
F(6,6,6,6,6,6,6,6)=1

if all inputs that are numeric are equal, the function returns 1 and if all are not equal, function returns 0. In the first exaple, 2 and 3 and 4 are not equal so the function returned 0. In the second example all inputs are 2 so the function returned 1. Does matlab have such function?

[David Hill]

You need to explain more. I cannot determine what you want. F cannot be 3,6, and 8 dimensional at the same time.

[Zeynab Mousavikhamene]

@David Hill added more explanation.

Answer 1

[Stephen23]

>> F = @(varargin)isequal(varargin{:});
>> F(2,3,4)
ans = 0
>> F(2,2,2)
ans = 1
>> F(5,6,7,8,9,2)
ans = 0
>> F(6,6,6,6,6,6,6,6)
ans = 1

Answer 2

[Guillaume]

Assuming your input is a vector:

all(diff(yourvector) == 0)

is what you want:

>> all(diff([2, 3, 4]) == 0)
ans =
  logical
   0
>> all(diff([2, 2, 2]) == 0)
ans =
  logical
   1
>> all(diff([5, 6, 7, 8, 9, 2]) == 0)
ans =
  logical
   0
>> all(diff([6, 6, 6, 6, 6, 6, 6, 6]) == 0)
ans =
  logical
   1

Answer 3

[Rik]

Another of the many strategies: count the number of elements a unique() call gives you. (when I'm back at a computer I'll test the performance of the answers so far)

F=@(varargin) 1==numel(unique([varargin{:}]));

Answer 4

[GeeTwo]

With a vector of singles or doubles, you could use ~std([a b c d]). If all the values are the same, the standard deviation will be zero, so the negation will be true.

Similar to star strider's function:

F=@(v)~std(v);

If you really want all of the inputs as separate arguments (again, singles or doubles),

function ans = allEqual(varargin)

~std(cell2mat(varargin));

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