Undefined function 'eq' for input arguments of type 'struct'

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Hi! I create this code in which s is a struct

if(s(1,1)==[])
  i=i+1;
end

I have an error: 'Undefined function 'eq' for input arguments of type 'struct', I don't understand the error's meaning. Someone can help me, thanks

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Stephen23 2015-10-27

Do you want to test if the structure is empty?

If s is a structure, then s(1,1) will also be a structure, which clearly is not a number and so does not make sense to check if it equals something else.

pamela sulis 2015-10-28

编辑：pamela sulis 2015-10-28

yes, i want to test if the structure is empty... I try if(isempty(s)) instead of if(s(1,1)==[]) and i solve my problem! Thanks

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Answer 1

James Tursa 2015-10-27

在 MATLAB Online 中打开

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Does this do what you want?

if( isempty(s) )

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James Tursa 2015-10-27

编辑：James Tursa 2015-10-27

I know. It is for readability ... at least to my eyes. Could be as you surmise, because it looks more like C or Fortran, so my brain doesn't have to think as much in determining what is on the line.

pamela sulis 2015-10-28

I use if( isempty(s) ) and i solve the problem! Thanks

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Undefined function 'eq' for input arguments of type 'struct'

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