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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD>
<TITLE>I-J Square Root of Negative One
</TITLE>
</HEAD>
<BODY>
<H2>I-J Square Root of Negative One
</H2>
<P>
Section: <A HREF=sec_constants.html> Base Constants </A>
<H3>Usage</H3>
Returns a <code>complex</code> value that represents the square root of -1. There are two
functions that return the same value:
<PRE>
y = i
</PRE>
<P>
and
<PRE>
y = j.
</PRE>
<P>
This allows either <code>i</code> or <code>j</code> to be used as loop indices. The returned value is a 32-bit complex value.
<H3>Example</H3>
The following examples demonstrate a few calculations with <code>i</code>.
<PRE>
--> i
ans =
0.0000 + 1.0000i
--> i^2
ans =
-1.0000 + 0.0000i
</PRE>
<P>
The same calculations with <code>j</code>:
<PRE>
--> j
ans =
0.0000 + 1.0000i
--> j^2
ans =
-1.0000 + 0.0000i
</PRE>
<P>
Here is an example of how <code>i</code> can be used as a loop index and then recovered as the square root of -1.
<PRE>
--> accum = 0; for i=1:100; accum = accum + i; end; accum
ans =
5050
--> i
ans =
100
--> clear i
--> i
ans =
0.0000 + 1.0000i
</PRE>
<P>
</BODY>
</HTML>
|
