fprintf function for structuring element

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Caleb 2013-3-18

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https://ww2.mathworks.cn/matlabcentral/answers/67669-fprintf-function-for-structuring-element

I'm working on a GUI that outputs user commands to a script file, and I've run into an issue programming the structuring element for performing morphological operations. As it stands, I construct the structuring element by allowing the user to choose the shape and the values for radius, length, or whatever, so the structuring element looks something like:

se = strel('disk',5);

However, I can't output that statement to the script using fprintf because it's a mix of character values and numerical values. So, how can this be done?

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Cedric 2013-3-18

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https://ww2.mathworks.cn/matlabcentral/answers/67669-fprintf-function-for-structuring-element#answer_79098

编辑：Cedric 2013-3-18

在 MATLAB Online 中打开

 fid = fopen ('script.txt', 'a') ;
 disk = 5 ;    % Defined form user input.
 fprintf(fid, 'se = strel(''disk'', %g);\n', disk) ;
 square = 7 ;   % Defined form user input.
 fprintf(fid, 'se = strel(''square'', %g);\n', square) ;
 % You could also have the shape given as a string from some drop-down and  
 % use it as in ..
 shape = 'triangle' ;   % Defined from drop-down.
 value = 5 ;
 fprintf(fid, 'se = strel(''%s'', %g);\n', shape, value) ;
 % ...
 fclose(fid) ;

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Cedric 2013-3-18

编辑：Cedric 2013-3-18

在 MATLAB Online 中打开

I had a look at your former question here. Note that you could build methods for managing logs, e.g.

 properties
     log_fid = -1
     ...
 end
 methods
    function self = logOpen(self, fileLocator)
       self.log_fid = fopen(fileLocator, 'w') ;
    end
    function logClose()
       fclose(self.log_fid) ;
    end
    function log(self, fmt, varargin)
        if self.log_fid > 0 
           fprintf(self.log_fid, fmt, varargin{:}) ;
        end
        % or throw an error/warning
    end
    function SE = strel(self, shape, varargin)
       if self.log_fid > 0
          self.log('%%Build STREL (shape=%s)\n', shape) ;
          cmdStr = ['SE = strel(''', shape, '''', ...
                    sprintf(', %g', varargin{:}), ')\n'] ;
          self.log(cmdStr) ;
       end
       SE = strel(shape, varargin{:}) ;
    end
end

I am mentioning this to illustrate the use of varargin read as a comma -separated list.

EDIT: added self.strel() so you see how you can have a STREL function adding automatically an entry into the logs.

Cedric 2013-3-19

编辑：Cedric 2013-3-19

在 MATLAB Online 中打开

Actually if you perform

 se  = strel('disk',5);
 img = imdilate(img, se);

what you want to do in order to save these "commands" to file is:

 fprintf(fid, 'se = strel(''disk'',5);\n') ;
 fprintf(fid, 'img = imdilate(img, se);\n') ;

If you had the shape defined by some control in your GUI and saved in a string variable named shape, you could do the following:

 fprintf(fid, 'se = strel(''%s'',5);\n', shape) ;
 fprintf(fid, 'img = imdilate(img, se);\n') ;

In any case, you want the string 'se' to be in the format of FPRINTF, and not the output of disp(se), as it is the se that will be created when the saved script will be run that must be passed to IMDILATE, and not "some representation" of the current se.

Caleb 2013-3-19