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function varargout = nInputSeries(varargin)
// Count the number of input output data series
//
// Calling Sequence
// ioData = nInputSeries(plantData)
//
// Parameters
// plantData : iddata type module
// ioData : structure type variable having input and output object
//
// Description
// plantData must be iddata type. The function returns the number of input and output data series in struct form. It has two fields name as input and output.
//
// Examples
// plantData = iddata(rand(100,3),rand(100,2),0.1)
// ioData = nInputSeries(plantData)
//
// Examples
// plantData = iddata(rand(100,2),[],0.1)
// ioData = nInputSeries(plantData)
//
// Examples
// plantData = iddata([],rand(100,3),0.1)
// ioData = nInputSeries(plantData)
//
// Authors
// Ashutosh Kumar Bhargava, Bhushan Manjarekar
//
[lhs rhs] = argn(0)
if rhs <> 1 then
error(msprintf(gettext("%s: Wrong number of input arguments."),"nInputSeries"))
end
iddataData = varargin(1)
if typeof(iddataData) <> 'iddata' then
error(msprintf(gettext("%s:Wrong type for input argument %d: ""iddata"" expected."),"nInputSeries",1))
end
t = struct('input',0,'output',0)
if ~size(iddataData.InputData,'*') then
t.input = 0
else
t.input = size(iddataData.InputData,'c')
end
if ~size(iddataData.OutputData,'*') then
t.output = 0
else
t.output = size(iddataData.InputData,'c')
end
varargout(1) = t
endfunction
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