what is wrong in this? how to use isinteger?

function valid= valid_date3(y,m,d)
    if ~isscalar(y) || ~isscalar(m) || ~isscalar(d) || ~isinteger(y) || ~isinteger(m) || ~isinteger(d) || y<1 || m<1 || d<1
        valid=false;
        return
    end

valid=valid_date3(1900,2,28)

valid =

logical

0

.

[Matt J]

You should consider using validateattributes() instead.

https://www.mathworks.com/help/matlab/ref/validateattributes.html#btnqd0h-attributes

Answer 1

[Matt J]

To test whether a variable is integer-valued, you would do

y==round(y)

isinteger is for something completely different. It simply tests whether y is stored in floating point form, or as an integer data type, e.g.,

>> isinteger(5)

ans =

  logical

   0

>> isinteger(uint8(5))

ans =

  logical

   1