1 files changed, 55 insertions, 1 deletions
diff --git a/help/en_US/isminphase.xml b/help/en_US/isminphase.xml
index f395fbe..40eef06 100644
--- a/help/en_US/isminphase.xml
+++ b/help/en_US/isminphase.xml
@@ -17,7 +17,61 @@
 
   <refnamediv>
     <refname>isminphase</refname>
-    <refpurpose>[nargout,nargin]=argn();</refpurpose>
+    <refpurpose>Checks given system function is Maximum-Phase system or not</refpurpose>
+    <para> </para>
   </refnamediv>
 
+<refsynopsisdiv>
+   <title>Calling Sequence</title>
+   <synopsis>
+flag = ismaxphase(b,a)
+flag = ismaxphase(sos)
+flag = ismaxphase(...,tol)
+   </synopsis>
+    <para> </para>
+</refsynopsisdiv>
+
+<refsection>
+   <title>Parameters</title>
+   <variablelist>
+   <varlistentry><term>b</term>
+      <listitem><para> Coefficients of numerator polynomial of system function </para></listitem></varlistentry>
+   <varlistentry><term>a</term>
+      <listitem><para> Coefficients of denumerator polynomial of system function</para></listitem></varlistentry>
+   <varlistentry><term>sos</term>
+      <listitem><para> Second order section matrix of order Kx6 </para></listitem></varlistentry>
+   <varlistentry><term>tol</term>
+      <listitem><para> Tolerence in similarities between two numbers in phase response </para></listitem></varlistentry>
+   <varlistentry><term>flag</term>
+      <listitem><para> This function returns logical 1 if system is minimum-phase system (flag = 1) </para> <para> Otherwise it returns logical 0 (flag = 0)</para></listitem></varlistentry>
+   </variablelist>
+    <para> </para>
+</refsection>
+
+<refsection>
+   <title>Description</title>
+   <para> This function determines whether the given system function is minimum-phase system or not . Minimum-phase system means all zeros of transfer function will be inside the unit circle in z-plane,also poles must be within unit circle for stability and causality </para>
+    <para> </para>
+</refsection>
+
+<refsection>
+   <title>Examples</title>
+
+   <para>Checking given system function is minimum phase system or not</para>
+   <para>
+    <latex>
+      \begin{eqnarray}
+      H(z) = 1 -0.3z^{-1} + 0.02 z^{-2}
+      \end{eqnarray}
+    </latex>
+   </para>
+    <para> </para>
+
+   <programlisting role="example"><![CDATA[
+b = [1 -0.3 0.02] ; //Numerator polynomial coefficients
+a = 1 ; //Denumerator polynomial coefficients
+flag = isminphase(b,a) //This is an example of Minimum-Phase system, hence it will give output as : flag = 1
+]]></programlisting>
+</refsection>
+
 </refentry>