Attempt to execute SCRIPT varargin as a function:

if ndims(img) ~= 3
    error('first argument should be a 3D image');
end

% in case of a label image, return a vector with a set of results
if ~islogical(img)
    labels = unique(img);
    labels(labels==0) = [];
    epcd = zeros(length(labels), 1);
    for i = 1:length(labels)
        epcd(i) = imEuler3dDensity(img==labels(i), varargin{:});
    end
    return;
end

% Process user input arguments
delta = [1 1 1];
conn = 6;
while ~isempty(varargin)
    var = varargin{1};
    if ~isnumeric(var)
        error('option should be numeric');
    end
    
    % option is either connectivity or resolution
    if isscalar(var)
        conn = var;
    else
        delta = var;
    end
    varargin(1) = [];
end

% Euler-Poincare Characteristic of each component in image
chi = imEuler3dEstimate(img, conn);

In this coding, following error

Attempt to execute SCRIPT varargin as a function:

C:\Program Files\mATLAB\R2019a\toolbox\matlab\lang\varargin.m

Answer 1

[Matt J]

Your function does not begin with the function declaration line.

[Walter Roberson]

... and varargin can only be used inside a function.

The related nargin() and nargout() are primarily intended to be used inside a function, but they also have other uses when a function handle is passed into them.

[Hla Hla]

Thanks

[Matt J]

You're welcome but please Accept-click the answer to indicate that your question was resolved.