Util.m

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 *
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 * Except for the comments, the function bodies of your M-file functions are untouched.
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 */

class Util {
    public: /* ( Constant ) */

        static const MachineFormat = "ieee-be";
    public: /* ( Static ) */ /* ( Constant ) */

        static function  saveRealMatrix(mat,file,folder) {
            if ~isreal(mat)/*  || ~ismatrix(mat) */

                error(" Matrix must contain only real values ");
            end
            prec = class(mat);
            /*  single precision is encoded as float32 */
            if strcmp(prec," single ")
                prec = " float32 ";
            end

            if nargin == 3
                if exist(folder," dir ") ~= 7
                    error(" Directory '%s' does not exist. ", folder);
                end
                file = fullfile(folder,file);
            end

            f = fopen(file," w+ ",Util.MachineFormat);
            try
                [n,m] = size(mat);
                if n > intmax(" int32 ") || m > intmax(" int32 ")
                    error(" Cannot save matrix: Dimensions exceed max int32 value. ");
                end
                fwrite(f,n," int32 ");
                fwrite(f,m," int32 ");
                /*  Matlab Rev. 2009a: entries are written in column order, which must be transposed
                 * in order to read them in row order (native storage format in java
                 * apache.commons.math */
                fwrite(f,mat^t,prec);
            catch ME
                fclose(f);
                rethrow(ME);
            end
            fclose(f);
        }
        static function  saveRealVector(vec,file,folder) {
            if ~isreal(vec) || ~isvector(vec)
                error(" vec must be a vector with real values ");
            end
            prec = class(vec);
            /*  single precision is encoded as float32 */
            if strcmp(prec," single ")
                prec = " float32 ";
            end

            if nargin == 3
                if exist(folder," dir ") ~= 7
                    error(" Directory '%s' does not exist. ", folder);
                end
                file = fullfile(folder,file);
            end

            f = fopen(file," w+ ",Util.MachineFormat);
            try
                s = length(vec);
                if s > intmax(" int32 ")
                    error(" Cannot save vector: Dimension exceeds max int32 value. ");
                end
                fwrite(f,s," int32 ");
                fwrite(f, vec, prec);
            catch ME
                fclose(f);
                rethrow(ME);
            end
            fclose(f);
        }
        static function charjsonobj = matrixToJSON(double value) {
            siz = sprintf(" %d,  ",size(value));
            vals = sprintf(" %.16e,  ",value(:));
            jsonobj = sprintf(" {'dim':[%s], 'values':[%s]} ",siz(1:end-2),vals(1:end-2));
        }
};