summaryrefslogtreecommitdiff
path: root/modules/interpolation/help/en_US/interpln.xml
blob: 7e159537fadb46eed5c2ef868f6d81510cfca520 (plain)
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
74
<?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:ns5="http://www.w3.org/1999/xhtml" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org" xml:id="interpln" xml:lang="en">
    <refnamediv>
        <refname>interpln</refname>
        <refpurpose>linear interpolation</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Calling Sequence</title>
        <synopsis>[y]=interpln(xyd,x)</synopsis>
    </refsynopsisdiv>
    <refsection>
        <title>Arguments</title>
        <variablelist>
            <varlistentry>
                <term>xyd</term>
                <listitem>
                    <para>2 row matrix (xy coordinates of points)</para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>x</term>
                <listitem>
                    <para>vector (abscissae)</para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>y</term>
                <listitem>
                    <para>vector (y-axis values)</para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsection>
    <refsection>
        <title>Description</title>
        <para>
            given <literal>xyd</literal> a set of points in the xy-plane which
            increasing abscissae and <literal>x</literal> a set of abscissae, this
            function computes <literal>y</literal> the corresponding y-axis values by
            linear interpolation.
        </para>
    </refsection>
    <refsection>
        <title>Examples</title>
        <programlisting role="example"><![CDATA[ 
x=[1 10 20 30 40];
y=[1 30 -10 20 40];
plot2d(x',y',[-3],"011"," ",[-10,-40,50,50]);
yi=interpln([x;y],-4:45);
plot2d((-4:45)',yi',[3],"000");
 ]]></programlisting>
        <scilab:image>
            x=[1 10 20 30 40];
            y=[1 30 -10 20 40];
            plot2d(x',y',[-3],"011"," ",[-10,-40,50,50]);
            yi=interpln([x;y],-4:45);
            plot2d((-4:45)',yi',[3],"000");
        </scilab:image>
    </refsection>
    <refsection role="see also">
        <title>See Also</title>
        <simplelist type="inline">
            <member>
                <link linkend="splin">splin</link>
            </member>
            <member>
                <link linkend="interp">interp</link>
            </member>
            <member>
                <link linkend="smooth">smooth</link>
            </member>
        </simplelist>
    </refsection>
</refentry>