help me correct error

2015 11 16
1 个回答
更新时间：2015 11 17
6 次查看（30 天）

0 个投票

%%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');

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Adam
Adam 2015-11-16
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
Geoff Hayes 2015-11-16
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
Maida Abbasi 2015-11-17
编辑：Walter Roberson 2015-11-17
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);

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回答（1 个）

Walter Roberson
Walter Roberson 2015-11-17

0 个投票

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.

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Maida Abbasi
Maida Abbasi 2015-11-17
编辑：Walter Roberson 2015-11-17
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
Maida Abbasi 2015-11-17
编辑：Walter Roberson 2015-11-17
>> 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
Walter Roberson 2015-11-17
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.

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Stephen23
Stephen23
2015-11-17

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