Writing string into array

2016 8 20
2 个回答
更新时间：2016 8 25
2 次查看（30 天）

0 个投票

Hi,
I'm trying to write strings into an array, but for some reason it's not working as expected (and has been working perfectly in other code I have)
So I have in a for loop:
newtimearray(n,:)=[datestr(timestamp,'yy') datestr(timestamp,'mm')...
datestr(timestamp,'dd') datestr(timestamp,'HH') datestr(timestamp,'MM')...
datestr(timestamp,'ss') strcat(fileID,'-',num2str(chunkCnt),'.bin') 'normal'];
However, instead of saving every entry into a single cell, it merges everything into one single string.
newtimearray =
16051512100100000000-6.binnormal
16051512400100000001-6.binnormal
16051513100100000002-6.binnormal
As I said, similar code is working fine and I don't see the error.
Thanks :)

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per isakson
per isakson 2016-8-20
With which releases (of Matlab) did it work and with which did it not?

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回答（2 个）

Image Analyst
Image Analyst 2016-8-20

0 个投票

You're writing them into a regular character array because you used square brackets, not into a cell array, which requires braces. To see the differences and to learn when to use braces, brackets, and parentheses, see the FAQ: http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

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Anke Kügler
Anke Kügler 2016-8-20
I did try curly braces and got the error 'Conversion to char from cell is not possible.'
Also, as I mentioned, the exact same syntax is working with another code.
Image Analyst
Image Analyst 2016-8-25
What kind of array do you want, a cell array, or a character array? And tell me what "timestamp" is.

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Anke Kügler
Anke Kügler 2016-8-20
编辑：Anke Kügler 2016-8-20

0 个投票

This is the code that works, producing a cell-array
for k = 2 : numel(subfolder)
wavefiles=dir(char(subfolder(k)));
fullname=fullfile(char(subfolder(k)),wavefiles(5).name);
fid = fopen(fullname);
fseek(fid,364,'bof');
datestring=char(fread(fid,[1, 24],'char'));
subfolderstr=char(subfolder(k));
scene= cellstr(subfolderstr(end-12:end-5));
recording=cellstr(subfolderstr(end-3:end));
date=datestr(datenum(sprintf(datestring),'yyyy-mm-ddHH:MM:SS'),'mm/dd/yyyy'); %get date from timestamp
time=datestr(datenum(sprintf(datestring),'yyyy-mm-ddHH:MM:SS'),'HH:MM:SS'); %get time from timestamp
timestamps(k-1,:)=[scene recording date time];
end
And this is the complete non-working code
%get the timestamp
logid=fopen([inlogpath, inlogfile], 'r');
filetimearr=textscan(logid, '%d %d %d %d %d %d %s %s','headerlines', 1);
yr=filetimearr{1}(n);
mo=filetimearr{2}(n);
dy=filetimearr{3}(n);
hr=filetimearr{4}(n);
mins=filetimearr{5}(n);
sec=filetimearr{6}(n);
type=filetimearr{8}(n);
timestamp=datenum(strcat(num2str(yr),sprintf('%02d',mo),sprintf('%02d',dy),sprintf('%02d',hr),sprintf('%02d',mins),sprintf('%02d',sec)),'yyyymmddHHMMSS');
fid=fopen(fullfilename);
[sig,TotalSamples] = fread (fid,inf,'int16');
chunkCnt=1;
Fs=125000;
numSamplesPerChunk = chunkDuration*Fs;
for l=1:numSamplesPerChunk:TotalSamples
fseek(fid,l,'bof');
y=fread(fid, numSamplesPerChunk);
outFileName = strcat(fileID,'-',num2str(chunkCnt),'.bin');
fulloutname=fullfile(savepath,outFileName);
fidsave = fopen(fulloutname,'w');
fwrite(fidsave,y,'int16');
fclose(fidsave);
newtimearray(n,:)=[datestr(timestamp,'yy') datestr(timestamp,'mm') datestr(timestamp,'dd') datestr(timestamp,'HH') datestr(timestamp,'MM') datestr(timestamp,'ss') strcat(fileID,'-',num2str(chunkCnt),'.bin') 'normal'];
timestamp=addtodate(timestamp,chunkDuration,'second');
chunkCnt = chunkCnt + 1;
end

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