isreal(x) -> Bool

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


  1. Check if a single value is real:

    julia> isreal(3.14)
  2. Check if an array contains only real numbers:

    julia> arr = [1.0, 2.5, 3.7];
    julia> isreal(arr)
  3. Check if a complex number is real:

    julia> complex_num = 2 + 0im;
    julia> isreal(complex_num)
  4. Check if any element in an array is not real:
    julia> arr = [1.5, 2.5, 3 + 2im];
    julia> isreal(arr)

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

all, all!, angle, any, any!, falses, ifelse, is, isinf, isinteger, isnan, isperm, ispow2, isreal, trues,

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