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IMAG

 

Imag(X) returns the imaginary part of a complex variable X. Representing X as X_r + i*X_i, this function returns X_i. 

 

Example:  Y=Imag(X)

 

The above example will set the real part of Y (Y_r) to the imaginary part of X and the imaginary part of Y to zero.

 

Note that the Imag function is used to extract the imaginary part of a complex number variable or expression.  It cannot be used for assigning the imaginary part of a complex number.  For example,  the equation Imag(X)=4 will produce an error.  Instead you should just enter X=4*i which will set X to 0 + 4*i.  If you wish to only set the imaginary part of X, you can enter

 

X_i=4.0

 

See also: Real, Magnitude, Angle, CIS, Complex Numbers, Mathematical Functions