code changes by Kartik Hegde during FOSSEE Fellowship 2018

1 files changed, 17 insertions, 3 deletions

diff --git a/macros/impz.sci b/macros/impz.sci
index cfa9b32..1172b81 100644
--- a/macros/impz.sci
+++ b/macros/impz.sci
@@ -1,6 +1,6 @@
 function [x_r, t_r] = impz(b, a, n, fs)
+// It gives Impulse response of digital filter
 
-//
 //Calling Sequence
 //x_r = impz(b)
 //x_r = impz(b, a)
@@ -8,13 +8,27 @@ function [x_r, t_r] = impz(b, a, n, fs)
 //x_r = impz(b, a, n, fs)
 //[x_r, t_r] = impz(b, a, n, fs)
 
-//Parameters 
-//
+//Parameters
+//x_r: impz chooses the number of samples and returns the response in the column vector, x_r.
+//t_r : impz returns the sample times in the column vector, t_r
+// b : numerator coefficients of the filter
+// a : denominator coefficients of the filter
+// n : samples of the impulse response   t(by default ,n = length(t) and  is computed automatically.
+// fs : sampling frequency
 
 //Description
+//[x_r,t_r] = impz(b,a) returns the impulse response of the filter with numerator coefficients, b, and denominator coefficients, a. impz chooses the number of samples and returns the response in the column vector, x_r, and the sample times in the column vector, t_r. t_r = [0:n-1]' and n = length(t) is computed automatically.
 
 //Examples
+//[x_r,t_r]=impz([0 1 1],[1 -3 3 -1],10)
+//OUTPUT :
+// t_r = 0.    1.     2.    3.    4.       5.      6.      7.      8.       9
+// x_r=  0.    1.    4.    9.    16.    25.    36.    49.....64......81
 
+//[x_r,t_r]=impz(1,[1 1],5)
+//OUTPUT
+// t_r =   0.    1.    2.    3.    4
+//x_r =   1.  - 1.    1.  - 1.    1.
 
 //This function is being called from Octave