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function [a,b,w,cas1,fs]=phaseInputParseAs_ab(arg,nargin)
fs=0;
if nargin<2 then
error('no. of inputs not valid');
end
v=size(arg(2));
if size(v)>2 then
error ('invalid input dimension');
end
a=arg(1);
b=arg(2);
[n,k]=size(arg(2))
if nargin==2 then //(a,b) is the input
w=[0:(1/512):(511/512)]*%pi;
cas1=1;
elseif nargin==3 then //(a,b,n) or (a,b,w) or (a,b,'whole')
cas1=1;
v=size(arg(3));
if type(arg(3))==10 then
if arg(3)=='whole' then
n=512;
w=[0:(1/n):((n-1)/n)]*(2*%pi);
cas1=1;
else
error('invalid input');
end
elseif (type(arg(3))==1)
if (v==[1,1])&(floor(arg(3))==arg(3))&(arg(3)>0) then //i.e. the entry is a single integer
n=arg(3);
w=[0:(1/n):((n-1)/n)]*%pi;
elseif (v(1)==1) then //(sos,w) w must be one dimensional
w=arg(3);
elseif (v(2)==1) then //w to row matrix
w=(arg(3))';
else
error ('dimension of input is invalid');
end
else
error ('invalid input');
end
elseif nargin==4 then //(a,b,n,fs) or (a,b,f,fs) or (a,b,n,'whole')
if type(arg(4))==10 then
cas1=1;
if (arg(4)=='whole') then
v=size(arg(3));
if (v==[1,1])&(floor(arg(3))==arg(3))&(arg(3)>0) then //i.e. the entry is a single integer
n=arg(3);
w=[0:(1/n):((n-1)/n)]*(2*%pi);
else
error ('dimension of input is invalid');
end
else
error('invalid input');
end
elseif (type(arg(4))==1) then
v=size(arg(4));
if v~=[1,1] then
error ('dimension of input is invalid');
end
cas1=2;
fs=arg(4);
v=size(arg(3));
if (v==[1,1])&(floor(arg(3))==arg(3))&(arg(3)>0) then //i.e. the entry is a single integer
n=arg(3);
w=[0:(1/n):((n-1)/n)]*(%pi);
elseif (v(1)==1) then //(sos,w) w must be one dimensional
w=2*arg(3)*%pi/fs;
elseif (v(2)==1) then //w to row matrix
w=2*%pi*(arg(3))'/fs;
else
error ('dimension of input is invalid');
end
else
error ('input format is invalid');
end
elseif nargin==5 //(a,b,n,fs,'whole') or (a,b,f,fs,'whole')
if arg(5)=='whole' then
v=size(arg(4));
if v~=[1,1] then
error ('dimension of input is invalid');
end
cas1=2;
v=size(arg(3));
if (v==[1,1])&(floor(arg(3))==arg(3))&(arg(3)>0) then //i.e. the entry is a single integer
n=arg(3);
w=[0:(1/n):((n-1)/n)]*(2*%pi);
elseif (v(1)==1) then //(sos,w) w must be one dimensional
w=2*arg(3)*%pi/fs;
elseif (v(2)==1) then //w to row matrix
w=2*%pi*(arg(3))'/fs;
else
error ('dimension of input is invalid');
end
else
error ('input format is invalid');
end
end
//so that a,b are row vectors
[n,k]=size(a);
if k==1 then
a=a';
end
[n,k]=size(b);
if k==1 then
b=b';
end
endfunction
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