Code generation only supports cell operations for varargin and varargout.

I want to convert my matlab code to c code but the code readiness report is genrating some error.Everytime i am using a cell array it is saying that= Code generation only supports cell operations for varargin and varargout.

I tried to put normal brackets() instead of curly brackets but then also it was showing error in the following code below:

 main_fn ={'algorithm'};
  pm_fn = {'pm_tau','pm_window','pm_keypoints','pm_harris_prctile','pm_searchrange'};

I also tried this notation

 main_fn(1).algorithm='algorithm';

but still was receiving an error of function not predefine So is there any alternative way of defining these functions/strucutures???

Also in the code below in the curly bracket portion i was receiving the same error as above

%check for unknown option
fn_unknown = setdiff(fn, [main_fn,pm_fn,m_fn]);
for i=1:length(fn_unknown),
    warning('Unknown option "%s".',*fn_unknown{i});*
end

Answer 1

[Walter Roberson]

As I explained before, C is totally lacking in dynamic structures. Every structure must have an exact type (but that type can include unions). For example you can have your options stored as a structure array with fields such as optionname, ndim, arraysize, arrayclass, data . When ndim and arrayclass are each restricted to a small number of possibilities, that leads to an enumerable number of C data types such as

union dataunion { double* double_1D; double **double_2D; short* int16_1D; short** int16_2D  };

that can be used to access the data legally in C.

But since this is all option data you might find it a lot easier to convert all of the options to 2D double (that might happen to have a dimension of 1 if they are a vector) and then your structure has fields optionname, heightwidth, data . The names are now data and not fieldnames.

Convert your cell array of strings to a blank-padded char array and loop through the rows checking strcmp(optionname, strtrim(optiontable(K,:)))

I do not know for sure, but possibly if you code as

optiontable = char({'first'; 'second'; 'thirdoption'});

then it might be able to generate the table for you instead of requiring you to code like ['first '; 'second '; 'thirdoption']