1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD>
<TITLE>ABS Absolute Value Function
</TITLE>
</HEAD>
<BODY>
<H2>ABS Absolute Value Function
</H2>
<P>
Section: <A HREF=sec_elementary.html> Elementary Functions </A>
<H3>Usage</H3>
Returns the absolute value of the input array for all elements. The
general syntax for its use is
<PRE>
y = abs(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 absolute value is a floating
point array, so that the return type is <code>float</code>. For <code>dcomplex</code>
inputs, the absolute value is a double precision floating point array, so that
the return type is <code>double</code>.
<H3>Example</H3>
The following demonstrates the <code>abs</code> applied to a complex scalar.
<PRE>
--> abs(3+4*i)
ans =
5
</PRE>
<P>
The <code>abs</code> function applied to integer and real values:
<PRE>
--> abs([-2,3,-4,5])
ans =
2 3 4 5
</PRE>
<P>
For a double-precision complex array,
<PRE>
--> abs([2.0+3.0*i,i])
ans =
3.6056 1.0000
</PRE>
<P>
</BODY>
</HTML>
|
