combination function using ndgrid

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Nik Sam 2016-5-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/284685-combination-function-using-ndgrid

评论： Nik Sam 2016-5-19

采纳的回答： Guillaume

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Hello,

I want to build a function which use ndgrid.

My function is

function [ varargout ] = comb( varargin )
[varargout]=ndgrid(varargin)
varargout=varargout(:);
disp([varargout])
end

My varargout are x1 x2 x3 and varargin are a,b,c where a=[1 2], b=[2 3] and c=[1 4]. Expected results are

       1     2     1
       2     2     1
       1     3     1
       2     3     1
       1     2     4
       2     2     4
       1     3     4
       2     3     4

but it seems like ndgrid doesn't work. What can i do? In command window works fine but as a function where I can put more varargins something is wrong.

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采纳的回答

Guillaume 2016-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/284685-combination-function-using-ndgrid#answer_222599

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function varargout = comb(varargin)
   varargout = cell(1, nargout);
   [varargout{:}] = ndgrid(varargin{:};  %distribute to varargout
   varargout = cellfun(@(m) reshape(m, [], 1), varargout, 'UniformOutput', false); %reshape into columns
end

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Guillaume 2016-5-19

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[varargout{:}]

at the end of the function will do it. This will always display the output whether or not you terminate the call to comb with a semicolon, so I wouldn't recommend it.

There is no way to detect if a function has called with a semicolon or not, so you can't toggle that behaviour.

Nik Sam 2016-5-19

Really thanks for your time my friend..Now finally I have the desired result..

Thanks again...

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Walter Roberson 2016-5-18

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[varargout{:}] = ndgrid(varargin{:});

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Walter Roberson 2016-5-18

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function [ varargout ] = comb( varargin )
  [varargout{1:nargout}] = ndgrid(varargin{:});
end

Nik Sam 2016-5-18

在 MATLAB Online 中打开

This works my friend but if I run the following

>> a=[1,2];

>> b=[2,3];

>> c=[1,4];

>> [x1,x2,x3]=comb(a,b,c)

I get this

x1(:,:,1) =

     1     1
     2     2

x1(:,:,2) =

     1     1
     2     2

x2(:,:,1) =

     2     3
     2     3

x2(:,:,2) =

     2     3
     2     3

x3(:,:,1) =

     1     1
     1     1

x3(:,:,2) =

     4     4
     4     4

But i want as result:

       1     2     1
       2     2     1
       1     3     1
       2     3     1
       1     2     4
       2     2     4
       1     3     4
       2     3     4