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isinteger

isinteger(x) -> Bool

Test whether x or all its elements are numerically equal to some integer

Examples

1. Check if a single value is an integer:

   julia> x = 5;
   julia> isinteger(x)
   true

   This example checks if the value of x is an integer.

2. Check if all elements of an array are integers:

   julia> arr = [1, 2, 3, 4];
   julia> isinteger(arr)
   true

   It checks if all elements in the array arr are integers.

3. Handle non-integer values:

   julia> y = 3.14;
   julia> isinteger(y)
   false

   In this example, isinteger returns false because y is not an integer.

4. Check if elements of a matrix are integers:

   julia> matrix = [1 2; 3 4];
   julia> isinteger(matrix)
   true

   This example checks if all elements in the matrix are integers.

Common mistake example:

julia> z = "10";
julia> isinteger(z)
ERROR: MethodError: no method matching isinteger(::String)

In this example, the isinteger function cannot be applied to a string. It can only be used with numerical types. Make sure to provide valid numeric inputs to isinteger to avoid such errors.

See Also

User Contributed Notes

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