The error regarding 'is_dyn'

Hello, I am not good at matlab coding. While running a toolbox with my input data I faced errors. To fix my inpu structure I need to understand these lines of the scripts. Do any one have any idea about these code? Why the 'is_dyn' is normally used? Thanks in advance.

FileCont = load (files{i_sub});
            if(~isfield(FileCont,MatrixName))
                error(['The field "' MatrixName '" has not been found: ' ]);
            end
            
            if isfield(FileCont,'is_dyn')
                is_dyn = FileCont.is_dyn;
            else
                is_dyn = 0;
            end
            
            
            if(is_dyn == 1)
                n_dyn = size(FileCont.(MatrixName),2);
            else
                n_dyn = 1;
            end
            
            for i_dyn = 1:n_dyn
                
                if(iscell(MatrixName))
                    MatrixName = MatrixName{:};
                end
                
                
                if(is_dyn)
                    R = FileCont.(MatrixName){i_dyn};
                else
                    R = FileCont.(MatrixName);
                end
                
                del = find(brain==0);
                R(del,:) = [];
                R(:,del) = [];
           

Answer 1

[Maneet Kaur Bagga]

Hi Shukla,

As per my understanding "is_dyn" variable is used to determine whether the input data is considered dynamic or not. The code functions as:

• The "load(files{i_sub})" loads the contents of a file specified by the "files{i_sub}" into the "FileCont" structure.
• The "if(~isfield(FileCont,MatrixName))" condition checks if the field specified by "MatrixName" exists in "FileCont." If it doesn't, an error is thrown, indicating that the field was not found.
• Inside the loop, the condition "if(iscell(MatrixName))" checks if "MatrixName" is a cell array. If it is, "MatrixName" is converted to a string.
• The following "if(is_dyn)" condition checks if "is_dyn" is true. If it is, R is assigned the value of "FileCont.(MatrixName){i_dyn}". Otherwise, R is assigned the value of "FileCont.(MatrixName)". Finally, the code removes rows and columns from R where the corresponding indices in the "brain" variable are equal to 0.

Please refer to the MATLAB Documentation for better understanding of the functions used:

load function

https://www.mathworks.com/help/matlab/ref/load.html

isfield function

https://www.mathworks.com/help/matlab/ref/isfield.html

iscell

https://www.mathworks.com/help/matlab/ref/iscell.html

Hope this helps!

Thank You

Maneet Bagga