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function sys = armaX(varargin)
[lhs , rhs] = argn();
if ( rhs < 2 ) then
errmsg = msprintf(gettext("%s: Unexpected number of input arguments : %d provided while should be 2"), "armaX", rhs);
error(errmsg)
end
z = varargin(1)
if typeof(z) == 'iddata' then
Ts = z.Ts;unit = z.TimeUnit
z = [z.OutputData z.InputData]
elseif typeof(z) == 'constant' then
Ts = 1;unit = 'seconds'
end
if ((~size(z,2)==2) & (~size(z,1)==2)) then
errmsg = msprintf(gettext("%s: input and output data matrix should be of size (number of data)*2"), "armaX");
error(errmsg);
end
if (~isreal(z)) then
errmsg = msprintf(gettext("%s: input and output data matrix should be a real matrix"), "armaX");
error(errmsg);
end
n = varargin(2)
if (size(n,"*")<3| size(n,"*")>4) then
errmsg = msprintf(gettext("%s: The order and delay matrix [na nb nc nk] should be of size [3 or 4]"), "armaX");
error(errmsg);
end
if (size(find(n<0),"*") | size(find(((n-floor(n))<%eps)== %f))) then
errmsg = msprintf(gettext("%s: values of order and delay matrix [na nb nc nk] should be nonnegative integer number "), "armaX");
error(errmsg);
end
na = n(1); nb = n(2); nc = n(3); //nd = n(4);nf = n(5);
if (size(n,"*") == 3) then
nk = 1
else
nk = n(4);
end
// storing U(k) , y(k) and n data in UDATA,YDATA and NDATA respectively
YDATA = z(:,1);
UDATA = z(:,2);
sys = estpoly(z,[na,nb,nc,0,0,nk])
endfunction
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