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import tab and comma delimited data in Matlab

Posted on 2011-03-17
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Last Modified: 2016-03-02
I'm a newbie and am struggling to import a dat file which is a combination of tab and comma delimited data.

I have attached a sample dat file which is very easy to import in excel but in MATLAB i cannot get it to work.

I am trying to create a structure called mydat which will contain (see dat file, note the tabs and commas)

mydat.param1 = 1.01
mydat.param2 = 1.02
mydat.param3 = 1.03

mydat.curves  = [1.01 2.01 3.01 4.01;
                            1.02 2.02 3.02 4.02;
                            1.03 2.03 3.03 4.03]

mydat.curves_info = [data1; data2; data3; data4]

need help! mydat.txt
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Question by:salamay
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Expert Comment

by:yuk99
ID: 35168811
Here is the script to read this file:

% open the file and read all the data as strings skipping empty lines
filename = 'mydat.txt';
fid = fopen(filename,'r');
% textscan process the file with : or , as delimiters
C = textscan(fid,'%s','delimiter',':,','MultipleDelimsAsOne',1);
C = C{1};
fclose(fid);
% find param lines
pname = regexp(C,'^param\d','once','match');
pidx = find(~cellfun(@isempty,pname,'UniformOutput',true));
pname = pname(pidx);
% get param values
pval = str2double(C(pidx+1));
% create the structure
mydat = cell2struct(num2cell(pval),pname);
% find info lines and get the values
iidx = find(~cellfun(@isempty,regexp(C,'^info\d','once'),'UniformOutput',true));
rows = numel(iidx);
icell = reshape(C(iidx(end)+1:end),[],rows+1)';
% add the data to structure
mydat.curves = str2double(icell(2:end,:));
mydat.curves_info = strtrim(icell(1,:));
% clear temporary variables
clear C pname pidx pval iidx icell rows fid

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See the comments and try to run it line by line reviewing variables to understand how it works.
Let me know if it's not doing exactly what you need.
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Author Comment

by:salamay
ID: 35169095
??? Error using ==> cell2struct
Duplicate field name "param2"

Error in ==> test2 at 15
mydat = cell2struct(num2cell(pval),pname);
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Author Comment

by:salamay
ID: 35169109
oh please ignore the above error.
My dat file had a duplicat field
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Author Comment

by:salamay
ID: 35169175
Well this is interesting but lets say i have

Time
Temp
Press

in place of

Param1
Param2
Param3

1. Could I use Regex for searching Time, Temp,  Press in a single statement?

2. Lets say if I dont know whats param1 2 or 3 (could be anything in that place) but i wanna get it in my structure knowing where they start and where they end (line 5 to Line 7), How can I do it?
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Accepted Solution

by:
yuk99 earned 500 total points
ID: 35172970
Replace lines 8-15 with the code below.
Note that it uses Parameteres line (wrong spelling?) in your file to find the parameters. It also assumes you always have -------- lines. If not, delete those lines using regexp in C variable before further processing.
The code also throw out the units of the parameters. Do you want to keep it somehow in the structure?
% find parameters lines
pidx1 = find(~cellfun(@isempty,regexp(C,'^Parameteres','once')));
pidx2 = find(~cellfun(@isempty,regexp(C,'^Information','once')));
% get parameters
pcell = reshape(C(pidx1+2:pidx2-2),2,[])';
pname = regexp(pcell(:,1),'^\w+','once','match');
% create the structure
mydat = cell2struct(num2cell(pcell(:,2)),pname);

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