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
|
<?xml version="1.0" encoding="UTF-8"?>
<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" version="5.0-subset Scilab" xml:lang="en" xml:id="predef">
<info>
<pubdate>$LastChangedDate$</pubdate>
</info>
<refnamediv>
<refname>predef</refname>
<refpurpose> variable protection</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>n=predef()
oldnew=predef(n)
oldnew=predef('all')
oldnew=predef('clear')</synopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>
Utility function used for defining "oldest" variables as "protected".
Protected variables cannot be killed. They are not saved
by the <literal>'save'</literal> command. The "oldest" are those appearing last in
the <literal>who('get')</literal>.</para>
<para><literal>predef()</literal> gets the number of protected variables</para>
<para><literal>predef('a[ll]')</literal> sets all the variables protected, it also return
the old and new value of protected variables number.</para>
<para><literal>predef('c[lear]')</literal> unprotect all but the last 7 variables, it also return
the old and new value of protected variables number.</para>
<para><literal>predef(n)</literal> sets the <literal>max(n,7)</literal> last defined variables as protected, it also return
the old and new value of protected variables number.</para>
</refsection>
<refsection>
<title>Remarks:</title>
<para>Variable <literal>ans</literal> created automatically when expressions are not assigned is never protected by <literal>predef('all')</literal>.</para>
<para>
A number of protected variables are set in the start-up file <literal>SCI/etc/scilab.start</literal>.
User may in particular set its own predefined variables in user's startup files
<literal>SCIHOME/.scilab</literal> and <literal>SCIHOME/scilab.ini</literal>
</para>
</refsection>
<refsection>
<title>See Also</title>
<simplelist type="inline">
<member>
<link linkend="clear">clear</link>
</member>
<member>
<link linkend="save">save</link>
</member>
<member>
<link linkend="ans">ans</link>
</member>
<member>
<link linkend="startup">startup</link>
</member>
</simplelist>
</refsection>
</refentry>
|
