unsolved function

>> n=-3:0.13; >> x=stepseq(0,-3,3); ??? Undefined function or method 'stepseq' for input arguments of type 'double'.

>> n=-5:5; >> x=impseq(-3,-5,5); ??? Undefined function or method 'impseq' for input arguments of type 'double'.

please assist on the above unsolved functions

Giannis

Answer 1

[Charles Obare]

save this from the text.

function [x,n] = stepseq(n0,n1,n2)
% Generates x(n) = u(n-n0); n1 <= n,n0 <= n2
% ------------------------------------------
% [x,n] = stepseq(n0,n1,n2)
%
if ((n0 < n1) | (n0 > n2) | (n1 > n2))
	error('arguments must satisfy n1 <= n0 <= n2')
end
n = [n1:n2];
%x = [zeros(1,(n0-n1)), ones(1,(n2-n0+1))];
x = [(n-n0) >= 0];

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function [x,n] = impseq(n0,n1,n2)
% Generates x(n) = delta(n-n0); n1 <= n,n0 <= n2
% ----------------------------------------------
% [x,n] = impseq(n0,n1,n2)
%
if ((n0 < n1) | (n0 > n2) | (n1 > n2))
	error('arguments must satisfy n1 <= n0 <= n2')
end
n = [n1:n2];
%x = [zeros(1,(n0-n1)), 1, zeros(1,(n2-n0))];
x = [(n-n0) == 0];

Answer 2

[Paulo Silva]

Both of those functions aren't avaiable from MATLAB instalation files, they are from some book or files, create them first or download them and put them in the current path or some other path that MATLAB knows about.

You can get those functions and the rest of them from: Digital Signal Processing Using MATLAB by John Proakis

Answer 3

[Sean de Wolski]

I've never heard of those functions before, nor are they on the file exchange.

[Paulo Silva]

They are from a book about signal processing, you can easily get them using google :)

[Sean de Wolski]

Ahh

The G00g13 wins again.. Apparently they are on the FEX as well.

[Paulo Silva]

I remembered the functions from one class I had last year, that book and files were great to understand signal processing.