You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: octavezmat.m
    path of file: ./repos/jsonlab
    
    the code of the file until where you have to start completion: function varargout = octavezmat(data, iscompress, zipmethod)
%
% output = octavezmat(input, iscompress, zipmethod)
%    or
% [output, info] = octavezmat(input, iscompress, zipmethod)
% unzipdata = octavezmat(zipdata, info)
%
% Compress or decompress zlib and gzip memory buffers using zip/unzip/gzip/gunzip on Octave
% in case ZMat toolbox (http://github.com/NeuroJSON/zmat) was not installed (ZMat is much faster)
%
% Author: Qianqian Fang (q.fang <at> neu.edu)
%
% input:
%      input: the input data (can be either compressed or before compression),
%             can be a string, a numerical vector or array
%      iscompress: (optional) if iscompress is 1, zmat compresses/encodes the input,
%             if 0, it decompresses/decodes the input. Default value is 1.
%
%             if iscompress is set to a negative integer, (-iscompress) specifies
%             the compression level. For zlib/gzip, default level is 6 (1-9); for
%             lzma/lzip, default level is 5 (1-9); for lz4hc, default level is 8 (1-16).
%             the default compression level is used if iscompress is set to 1.
%
%             zmat removes the trailing newline when iscompress=2 and method='base64'
%             all newlines are kept when iscompress=3 and method='base64'
%
%             if one defines iscompress as the info struct (2nd output of zmat), zmat

    
function varargout = octavezmat(data, iscompress, zipmethod)
%
% output = octavezmat(input, iscompress, zipmethod)
%    or
% [output, info] = octavezmat(input, iscompress, zipmethod)
% unzipdata = octavezmat(zipdata, info)
%
% Compress or decompress zlib and gzip memory buffers using zip/unzip/gzip/gunzip on Octave
% in case ZMat toolbox (http://github.com/NeuroJSON/zmat) was not installed (ZMat is much faster)
%
% Author: Qianqian Fang (q.fang <at> neu.edu)
%
% input:
%      input: the input data (can be either compressed or before compression),
%             can be a string, a numerical vector or array
%      iscompress: (optional) if iscompress is 1, zmat compresses/encodes the input,
%             if 0, it decompresses/decodes the input. Default value is 1.
%
%             if iscompress is set to a negative integer, (-iscompress) specifies
%             the compression level. For zlib/gzip, default level is 6 (1-9); for
%             lzma/lzip, default level is 5 (1-9); for lz4hc, default level is 8 (1-16).
%             the default compression level is used if iscompress is set to 1.
%
%             zmat removes the trailing newline when iscompress=2 and method='base64'
%             all newlines are kept when iscompress=3 and method='base64'
%
%             if one defines iscompress as the info struct (2nd output of zmat), zmat
%             will perform a decoding/decompression operation and recover the original
%             input using the info stored in the info structure.
%      method: (optional) compression method, only the below two methods are supported
%             'zlib': zlib/zip based data compression (default)
%             'gzip': gzip formatted data compression
%
% output:
%      output: the decompressed byte stream stored in a uint8 vector; if info is
%            given, output will restore the original data's type and dimensions
%      info: (optional) a struct storing additional info regarding the input data, may have
%            'type': the class of the input array
%            'size': the dimensions of the input array
%            'byte': the number of bytes per element in the input array
%            'method': a copy of the 3rd input indicating the encoding method
%            'status': the zlib/lzma/lz4 compression/decompression function return value,
%                    including potential error codes; see documentation of the respective
%                    libraries for details
%            'level': a copy of the iscompress flag; if non-zero, specifying compression
%                    level, see above
%
% examples:
%      NO_ZMAT=1  % by setting this flag to 1 in the caller or global workspace, octavezmat won't warn zmat is missing
%      [ss,info]=octavezmat(ones(10))
%      orig=octavezmat(ss,info)
%
% license:
%     BSD or GPL version 3, see LICENSE_{BSD,GPLv3}.txt files for details
%
% -- this function is part of JSONLab toolbox (http://iso2mesh.sf.net/cgi-bin/index.cgi?jsonlab)
%

nowarning = getvarfrom({'caller', 'base'}, 'NO_ZMAT');

if (isempty(nowarning) || nowarning == 0)
    warning('You are recommend