MATLAB: Undefined function ‘eq’ for input arguments of type ‘struct’

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

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

Best Answer

Does this do what you want?

if( isempty(s) )

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MATLAB: Function ‘eq’

Please read this faq: http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

In brief, note that .6 -.2 -.2 not equal to .2:

sprintf('%.17f',0.6-0.2-0.2)
ans =
0.19999999999999996

MATLAB: What is the meaning ??

You don't show the entire code, but my guess would be this is inside a function that looks something like this:

function outputs = myfunction(vectors,firstEig,lastEig,s_interactive,s_verbose)
if nargin < 5, s_verbose = 'on'; end
if nargin < 4, s_interactive = 'off'; end
if nargin < 3, lastEig = size(vectors, 1); end
if nargin < 2, firstEig = 1; end
    :
   etc

nargin is a function that returns the actual number of arguments passed into a function. So the code in question is simply assigning default values for those arguments that were not actually passed in. E.g., if the caller only passed in four arguments and did not pass in that last s_verbose argument, then the above code would assign the value 'on' to the s_verbose local variable.

Best Answer

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MATLAB: Function ‘eq’

MATLAB: What is the meaning ??

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