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