What is is.complex() function in R

If you are working with imaginary components, you might want to find whether you are working with complex numbers or not and that’s where the is.complex() function helps you.

The is.complex() is a built-in R function that checks whether an input object is of type “complex”. It returns TRUE if it is complex and FALSE if not.

Syntax

is.complex(obj)

Parameters

Visual Representation

Check if an input object is complex

R does not implicitly convert any number to a complex number; you have to create a complex number using the complex() function and pass the “real” and “imaginary” arguments.

is.complex(1 + 9i) # TRUE
is.complex(21) # FALSE
is.complex(2 - 1i) # TRUE

data <- complex(real = 1, imaginary = 2)
is.complex(data) # TRUE

Logical values

The is.complex() function returns FALSE for logical (TRUE or FALSE) values.

bool_val <- TRUE
is.complex(bool_val) # FALSE

bool_value <- FALSE
is.complex(bool_value) # FALSE

Character strings

The is.complex() function returns FALSE for character vectors.

str <- "Willow!"

is.complex(str) # FALSE

et <- ""

is.complex(et) # FALSE

That’s all!