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isreal

isreal(x) -> Bool

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

Examples

1. Check if a single value is real:

   julia> isreal(3.14)
   true

2. Check if an array contains only real numbers:

   julia> arr = [1.0, 2.5, 3.7];
   julia> isreal(arr)
   true

3. Check if a complex number is real:

   julia> complex_num = 2 + 0im;
   julia> isreal(complex_num)
   true

4. Check if any element in an array is not real:

   julia> arr = [1.5, 2.5, 3 + 2im];
   julia> isreal(arr)
   false

Common mistake example:

julia> isreal([1, 2, "3"])
ERROR: MethodError: no method matching isreal(::Array{Any,1})

In this example, the array contains a non-numeric element ("3"), which causes an error. The isreal function works only on numeric values, so make sure to provide valid input to avoid such errors.

See Also

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