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<TITLE>IMAG Imaginary Function
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<H2>IMAG Imaginary Function
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<P>
Section: <A HREF=sec_elementary.html> Elementary Functions </A>
<H3>Usage</H3>
Returns the imaginary part of the input array for all elements. The
general syntax for its use is
<PRE>
y = imag(x)
</PRE>
<P>
where <code>x</code> is an <code>n</code>-dimensional array of numerical type. The output
is the same numerical type as the input, unless the input is <code>complex</code>
or <code>dcomplex</code>. For <code>complex</code> inputs, the imaginary part is a floating
point array, so that the return type is <code>float</code>. For <code>dcomplex</code>
inputs, the imaginary part is a double precision floating point array, so that
the return type is <code>double</code>. The <code>imag</code> function returns zeros for
real and integer types.
<H3>Example</H3>
The following demonstrates <code>imag</code> applied to a complex scalar.
<PRE>
--> imag(3+4*i)
ans =
4
</PRE>
<P>
The imaginary part of real and integer arguments is a vector of zeros, the
same type and size of the argument.
<PRE>
--> imag([2,4,5,6])
ans =
0 0 0 0
</PRE>
<P>
For a double-precision complex array,
<PRE>
--> imag([2.0+3.0*i,i])
ans =
3 1
</PRE>
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