Append values from textscan into cell array literately in a loop - matlab

Question

Currently I have a txt file with data as shown below:
A11
Temperature=20 Weight=120 Speed=65
B13
Temperature=21 Weight=121 Speed=63
F24
Temperature=18 Weight=117 Speed=78
D43
Temperature=16 Weight=151 Speed=42
C32
Temperature=15 Weight=101 Speed=51
I would like to read the value into a cell array and convert it as matrix.
Below is my code:
% At first I read the data into a 1 column array
fid=fopen('file.txt');
tline = fgetl(fid);
tlines = cell(0,1);
while ischar(tline)
tlines{end+1,1} = tline;
tline = fgetl(fid);
end
fclose(fid);
% Then I check the size of the cell array
CellSize = size(tlines);
DataSize = CellSize(1,1);
% At last I setup a loop and literately read and input the values
Data = cell(0,3);
for i = 1:DataSize
Data{end+1,3} = textscan(tlines{i,1},'Temperature=%f Weight=%f Speed=%f');
end
However, I got 10x3 empty cell array.
[] [] *1x3cell*
[] [] *1x3cell*
[] [] *1x3cell*
[] [] *1x3cell*
[] [] *1x3cell*
[] [] *1x3cell*
[] [] *1x3cell*
[] [] *1x3cell*
[] [] *1x3cell*
[] [] *1x3cell*
I know the problem comes from the input of textscan value into the cell array. Can you help me fix the problem? Also how can I toss the empty value if the data doesn't contain the specific format.

Answer 1

The only mistake you made, was to index the content of Data using {}, and not the cells using (), see the help.
I modified the last part of your script:
% At last I setup a loop and literately read and input the values
Data = cell(DataSize, 3);
for i = 1:DataSize
Data(i, :) = textscan(tlines{i}, 'Temperature=%f Weight=%f Speed=%f')
end
Gives the following output:
Data =
{
[1,1] = [](0x1)
[2,1] = 20
[3,1] = [](0x1)
[4,1] = 21
[5,1] = [](0x1)
[6,1] = 18
[7,1] = [](0x1)
[8,1] = 16
[9,1] = [](0x1)
[10,1] = 15
[1,2] = [](0x1)
[2,2] = 120
[3,2] = [](0x1)
[4,2] = 121
[5,2] = [](0x1)
[6,2] = 117
[7,2] = [](0x1)
[8,2] = 151
[9,2] = [](0x1)
[10,2] = 101
[1,3] = [](0x1)
[2,3] = 65
[3,3] = [](0x1)
[4,3] = 63
[5,3] = [](0x1)
[6,3] = 78
[7,3] = [](0x1)
[8,3] = 42
[9,3] = [](0x1)
[10,3] = 51
}
Afterwards you could do:
% Clean up.
for i = DataSize:-1:1
if (isempty([Data{i, :}]))
Data(i, :) = [];
end
end
So that your output looks like this:
Data =
{
[1,1] = 20
[2,1] = 21
[3,1] = 18
[4,1] = 16
[5,1] = 15
[1,2] = 120
[2,2] = 121
[3,2] = 117
[4,2] = 151
[5,2] = 101
[1,3] = 65
[2,3] = 63
[3,3] = 78
[4,3] = 42
[5,3] = 51
}
Also, please don't do things like Data{end+1,3}, if the size is known in advance. I also modified this accordingly.

Answer 2

If you want to keep the header/name, this is not terribly elegant, but it will work:
fin = 'yourfilename.txt';
fid = fopen(fin);
stuff = textscan(fid, '%s');
fclose(fid);
stuff = stuff{:};
stuff = strrep(stuff, 'Temperature=', '');
stuff = strrep(stuff, 'Weight=', '');
stuff = strrep(stuff, 'Speed=', '');
len = length(stuff) / 4;
name = cell(1,len);
temp = NaN(1,len);
wt = NaN(1,len);
speed = NaN(1,len);
counter = 0;
for ii = 1:len
name(ii) = stuff(ii + counter);
temp(ii) = str2double(stuff(ii + counter +1));
wt(ii) = str2double(stuff(ii + counter +2));
speed(ii) = str2double(stuff(ii + counter +3));
counter = counter + 3;
end
name = cell2table(name', 'VariableNames', {'Name'});
temp = array2table(temp', 'VariableNames', {'Temperture'});
wt = array2table(wt', 'VariableNames', {'Weight'});
speed = array2table(speed', 'VariableNames', {'Speed'});
data = [name temp wt speed];