varargin error for optional inputs

7 visualizaciones (últimos 30 días)
Uma Narayan
Uma Narayan el 27 de Jun. de 2024
Comentada: Voss el 28 de Jun. de 2024
I was running this code
%%Parse Inputs
p = inputParser;
p.FunctionName = 'linear_inversion_ksn';
% required inputs
addRequired(p,'DEM', @(x) isa(x,'GRIDobj'));
% optional inputs
addOptional(p,'crita', 1e6, @(x) isscalar(x));
addOptional(p,'mn', 0.5, @(x) isscalar(x));
addOptional(p,'chi_inc', 1, @(x) isscalar(x));
addOptional(p,'gam', 10, @(x) isscalar(x));
addOptional(p,'flowOption', []);
parse(p,DEM, varargin{:});
DEM = p.Results.DEM;
And got an error like this
>> parse(p,DEM, varargin{:});
Brace indexing into the result of a function call is not supported. Assign the result
of 'varargin' to a variable first, then brace index into it.
Kindly help me in fixing it

Respuesta aceptada

Voss
Voss el 27 de Jun. de 2024
The problem is that varargin is not defined. Typically varargin refers to input arguments passed to a function. The code you are running appears to be a script, so varargin is not needed, since scripts take no input arguments.
  • If your code is a script, you can remove varargin{:} and just use parse(p,DEM);
  • If your code is a function and you need to use varargin to handle input arguments that may or may not be passed in, then you should define varargin in the function definition, as shown below, for example.
function DEM = test_DEM(DEM,varargin)
%%Parse Inputs
p = inputParser;
p.FunctionName = 'linear_inversion_ksn';
% required inputs
addRequired(p,'DEM', @(x) isa(x,'GRIDobj'));
% optional inputs
addOptional(p,'crita', 1e6, @(x) isscalar(x));
addOptional(p,'mn', 0.5, @(x) isscalar(x));
addOptional(p,'chi_inc', 1, @(x) isscalar(x));
addOptional(p,'gam', 10, @(x) isscalar(x));
addOptional(p,'flowOption', []);
parse(p,DEM, varargin{:});
DEM = p.Results.DEM;
end
References:
  2 comentarios
Uma Narayan
Uma Narayan el 28 de Jun. de 2024
Thanks.This works for me.
Voss
Voss el 28 de Jun. de 2024
You're welcome! Any questions, please let me know. Otherwise, please Accept this answer. Thanks!

Iniciar sesión para comentar.

Más respuestas (1)

Ashutosh Thakur
Ashutosh Thakur el 27 de Jun. de 2024
Hello Uma,
The error you are facing is due to the way in which MATLAB handles the varargin input. I can see that you are trying to pass varargin with brace indexing to the parse function. This behavior is not supported which is causing the issue. Instead, I recommend assigning the varargin to the different variable and pass that variable with the brace indexing to the parse function. https://www.mathworks.com/help/matlab/ref/varargin.html.
Following sample code can be referred for the above-mentioned approach:
function abc(varargin)
% Assign varargin to a variable first
vararginCell = varargin;
disp(vararginCell{1})
disp(vararginCell{2})
end
abc(1,2)
1 2
I hope that this helps you!
  1 comentario
Stephen23
Stephen23 el 27 de Jun. de 2024
abc(1,2)
1 2
function abc(varargin)
disp(varargin{1})
disp(varargin{2})
end

Iniciar sesión para comentar.

Categorías

Más información sobre Argument Definitions en Help Center y File Exchange.

Etiquetas

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by