1 files changed, 29 insertions, 21 deletions
diff --git a/help/en_US/chirp.xml b/help/en_US/chirp.xml
index 31ccb71..60fc279 100644
--- a/help/en_US/chirp.xml
+++ b/help/en_US/chirp.xml
@@ -17,10 +17,9 @@
 
   <refnamediv>
     <refname>chirp</refname>
-    <refpurpose>This function evaluates a chirp signal at time t.</refpurpose>
+    <refpurpose>Chirp signal at time t.</refpurpose>
   </refnamediv>
 
-
 <refsynopsisdiv>
    <title>Calling Sequence</title>
    <synopsis>
@@ -28,8 +27,8 @@
    y = chirp(t, f0)
    y = chirp(t, f0, t1)
    y = chirp(t, f0, t1, f1)
-   y = chirp(t, f0, t1, f1, frm)
-   y = chirp(t, f0, t1, f1, frm, phse)
+   y = chirp(t, f0, t1, f1, form)
+   y = chirp(t, f0, t1, f1, form, phase)
    </synopsis>
 </refsynopsisdiv>
 
@@ -37,26 +36,27 @@
    <title>Parameters</title>
    <variablelist>
    <varlistentry><term>t:</term>
-      <listitem><para> vector</para></listitem></varlistentry>
+      <listitem><para> a vector of times to evaluate the chirp signal.</para></listitem></varlistentry>
    <varlistentry><term>f0:</term>
-      <listitem><para> </para></listitem></varlistentry>
+      <listitem><para> the frequency at t=0. [default value = 0 Hz]</para></listitem></varlistentry>
    <varlistentry><term>t1:</term>
-      <listitem><para> </para></listitem></varlistentry>
+      <listitem><para> some intermediate time. [default value = 1 sec] </para></listitem></varlistentry>
    <varlistentry><term>f1:</term>
-      <listitem><para> </para></listitem></varlistentry>
-   <varlistentry><term>frm:</term>
-      <listitem><para> string value, takes in "linear", "quadratic", "logarithmic"</para></listitem></varlistentry>
-   <varlistentry><term>phse:</term>
-      <listitem><para> </para></listitem></varlistentry>
+      <listitem><para> frequency at t=t1. [default value = 100 Hz]</para></listitem></varlistentry>
+   <varlistentry><term>form:</term>
+      <listitem><para> string value, takes in "linear", "quadratic", "logarithmic". [default value = "linear"]</para></listitem></varlistentry>
+   <varlistentry><term>phase:</term>
+      <listitem><para> phase shift at t=0. [default value = 0]</para></listitem></varlistentry>
+   <varlistentry><term>y:</term>
+      <listitem><para> chirp signal value corresponding to t. </para></listitem></varlistentry>
    </variablelist>
 </refsection>
 
 <refsection>
    <title>Description</title>
    <para>
-This is an Octave function.
-This function evaluates a chirp signal at time t. A chirp signal is a frequency swept cosine wave.
-The first argument is a vector of times to evaluate the chirp signal, second argument is the frequency at t=0, third argument is time t1 and fourth argument is frequency at t1.
+This function evaluates a chirp signal at time t. A chirp signal is a frequency swept cosine wave.</para>
+<para>The first argument is a vector of times to evaluate the chirp signal, second argument is the frequency at t=0, third argument is time t1 and fourth argument is frequency at t1.
 The fifth argument is the form which takes in values "linear", "quadratic" and "logarithmic", the sixth argument gives the phase shift at t=0.
 </para>
 </refsection>
@@ -64,12 +64,20 @@ The fifth argument is the form which takes in values "linear", "quadratic" and "
 <refsection>
    <title>Examples</title>
    <programlisting role="example"><![CDATA[
-chirp([4,3,2,1],4,5,0.9)
-ans  =
-column 1 to 3
-0.9685832    0.2486899    0.0627905
-column 4
-- 0.3681246
+    t = [4,3,2,1];
+    f0 = 4;
+    t1 = 5;
+    f1 = 0.9;
+    form = "quadratic";
+    y = chirp(t, f0, t1, f1, form)
    ]]></programlisting>
 </refsection>
+
+<refsection>
+<title>Modified by :</title>
+<simplelist type="vert">
+<member>Sonu Sharma, RGIT Mumbai (fellow at FOSSEE, IIT Bombay)</member>
+    </simplelist>
+</refsection>
+
 </refentry>