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Excel IMSUM Function

Excel IMSUM function
Summary 

The Excel IMSUM function returns the sum of two or more complex numbers. The complex numbers must be in the form x + yi or x + yj. Use the COMPLEX function to create a complex number from real and imaginary parts.

Purpose 
Get sum of complex numbers
Return value 
Sum of complex numbers as text
Syntax 
=IMSUM (inumber1, [inumber2], ...)
Arguments 
  • inumber1 - Complex number 1.
  • inumber2 - [optional] Complex number 2.
Usage notes 

Use the Excel IMSUM function to get the sum of two or more complex numbers in the form x + yi or x + yj. For example:

=IMSUM("1+2i",3) // returns "4+2i"
=IMSUM("3+4i","1+2i") // returns "4+6i"

In the example shown, the formula in D6, copied down, is:

=IMSUM(B6,C6)
Related functions 
Excel COMPLEX function
Excel COMPLEX Function

The Excel COMPLEX function creates a complex number with given real and imaginary coefficients. COMPLEX returns a text result in the form x + yi or x + yj.

Excel IMREAL function
Excel IMREAL Function
The Excel IMREAL function returns the real coefficient of a complex number in the form x + yi or x + yj.
Excel IMAGINARY function
Excel IMAGINARY Function
The Excel IMAGINARY function returns the imaginary coefficient of a complex number given in the form x + yi or x + yj.
Excel IMPRODUCT function
Excel IMPRODUCT Function

The Excel IMPRODUCT function returns the product of one or more complex numbers. The complex number must be in the form x + yi or x + yj. Use the COMPLEX function to create a complex number...

Good links 
Microsoft IMSUM function documentation

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