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//User defined function
//Forms a transfer function
//Scilab: Co efficients are given in increasing power of variable
//Matlab: Co efficients are given in decreasing power of variable
//Hence co efficients are flipped here
//Input arguments: (1) Numerator co efficients(decreasing order)
//(2) Denominator co efficients
//(3) Variable to specify domain
// Updated (30-11-06)
// System is continuous => a is not passed
// System is discrete => a = -1
// System is discretized (sampled system) => a = Ts
// Uses syslin
function trfu = tf(num,den,a)
if argn(2) == 2
d = 'c';
elseif a == -1
d = 'd';
else
d = a
end;
num = clean(num);
den = clean(den);
num1 = poly(num(length(num):-1:1),'x','coeff');
den1 = poly(den(length(den):-1:1),'x','coeff');
trfu = syslin(d,num1,den1);
endfunction;
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