help me correct error

%%Test Lempel-Ziv decoder lz_decode.m by decoding data in check.txt.lz

clear all;

% Read binary file, where first byte is used to 
% indicate # zeros padded at the end

code = ReadBinFile('check.txt.lz');

% Decode file using lz_decode (to be written)

dec = lz_decode(code);

% Write result to output file. Here, no zero-padding will be performed!

WriteFile('check.txt.dec', dec);

i get this error

Error in ==> check at 6
code = ReadBinFile('check.txt.lz');

[Adam]

Is that the entire error message?

I would imagine it can't find the file 'check.txt.lz' without either it being on your path or being given a full path to the file, but it could also be that ReadBinFile is a function containing an error or one not found on the path. I assume the full error message would give a clear direction on which of these or something different it is.

[Geoff Hayes]

Maida - are there any more lines to the error that you observed (and if so could you copy and paste them to your question)? Is the ReadBinFile a function that you have written? Do you need to specify the path to the file check.txt.lz?

[Maida Abbasi]

this is the only error i get. ReadBinFile is an m file having following code.

function [outBits, outBytes] = ReadBinFile(FileName)

% [outBits outBytes] = ReadBinFile(FileName)
%
% Read data from file. The first byte is interpreted as integer and
% determines the number of zero-padded bits at the end.
%
%     FileName: Name of file
%     outBits: bit vector containing the bits of the file
%     outBytes: bit vector containing the bytes of the file

fid = fopen('check.txt.lz');

fileBytes = fread(fid)';

% First byte contains padding information
paddBits = fileBytes(1);
outBytes = fileBytes(2:end);

bits_tmp = dec2binvec(outBytes')';
outBits = reshape(bits_tmp(1:end-paddBits),1,numel(bits_tmp)-paddBits);

fclose(fid);

Answer 1

[Walter Roberson]

At the MATLAB command line, give the command

dbstop if error

and run the program. When it stops, show us the complete error message that is output.

[Maida Abbasi]

function out = dec2binvec(dec,n)

%DEC2BINVEC Convert decimal number to a binary vector.
%
%    DEC2BINVEC(D) returns the binary representation of D as a binary
%    vector.  The least significant bit is represented by the first 
%    column.  D must be a non-negative integer. 
% 
%    DEC2BINVEC(D,N) produces a binary representation with at least
%    N bits.
% 
%    Example:
%       dec2binvec(23) returns [1 1 1 0 1]
%
%    See also BINVEC2DEC, DEC2BIN.
%

%    MP 11-11-98
%    Copyright 1998-2003 The MathWorks, Inc.
%    $Revision: 1.5.2.4 $  $Date: 2003/08/29 04:40:56 $

% Error if dec is not defined.

if nargin < 1

     error('daq:dec2binvec:argcheck', 'D must be defined.  Type ''daqhelp dec2binvec'' for more information.');

end

% Error if D is not a double.

if ~isa(dec, 'double')

     error('daq:dec2binvec:argcheck', 'D must be a double.');

end

% Error if a negative number is passed in.

if (dec < 0)

     error('daq:dec2binvec:argcheck', 'D must be a positive integer.');
  end

% Convert the decimal number to a binary string.

switch nargin

case 1

     out = dec2bin(dec);

case 2

     out = dec2bin(dec,n);

end

% Convert the binary string, '1011', to a binvec, [1 1 0 1].

out = logical(STR2NUM([fliplr(out);blanks(length(out))]')');

it stopped at

 out = logical(STR2NUM([fliplr(out);blanks(length(out))]')');

[Maida Abbasi]

>> dbstop if error

??? Error using ==> vertcat
CAT arguments dimensions are not consistent.

Error in ==> dec2binvec at 45
out = logical(STR2NUM([fliplr(out);blanks(length(out))]')');

Error in ==> ReadBinFile at 15
bits_tmp = dec2binvec(outBytes')';

Error in ==> check at 6
code = ReadBinFile('check.txt.lz');

these are the errors i get

[Walter Roberson]

Shrug. I already told you what the problem was with this code. You did not listen then, so there is no reason to expect you would listen now.

[Stephen23]

Indeed Walter Roberson already gave an answer here:

http://www.mathworks.com/matlabcentral/answers/255155-help-me-solve-errors-in-this-code