How to read multiple text files and plot data?

I have 6-7 different log files and I need to plot the data on a graph. Here is my code for retriving data from a single file and plotting it.

fid = fopen('North.txt');
C = textscan(fid, '%s');
endc = length(C{1});


posx = [str2double(C{1}{1})];
index = 1;
for v=13:12:endc
   index = index + 1;
   posx(index) = str2double(C{1}{v});
end


posy = [str2double(C{1}{2})];
index = 1;
for v=14:12:endc
   index = index + 1;
   posy(index) = str2double(C{1}{v});
end

posz = [str2double(C{1}{3})];
index = 1;
for v=15:12:endc
   index = index + 1;
   posz(index) = str2double(C{1}{v});
end

rotx = [str2double(C{1}{4})];
index = 1;
for v=16:12:endc
   index = index + 1;
   rotx(index) = str2double(C{1}{v});
end

roty = [str2double(C{1}{5})];
index = 1;
for v=17:12:endc
   index = index + 1;
   roty(index) = str2double(C{1}{v});
end

rotz = [str2double(C{1}{6})];
index = 1;
for v=18:12:endc
   index = index + 1;
   rotz(index) = str2double(C{1}{v});
end

eulx = [str2double(C{1}{7})];
index = 1;
for v=19:12:endc
   index = index + 1;
   eulx(index) = str2double(C{1}{v});
end

euly = [str2double(C{1}{8})];
index = 1;
for v=20:12:endc
   index = index + 1;
   euly(index) = str2double(C{1}{v});
end

eulz = [str2double(C{1}{9})];
index = 1;
for v=21:12:endc
   index = index + 1;
   eulz(index) = str2double(C{1}{v});
end

objx = [str2double(C{1}{10})];
index = 1;
for v=22:12:endc
   index = index + 1;
   objx(index) = str2double(C{1}{v});
end

objy = [str2double(C{1}{11})];
index = 1;
for v=23:12:endc
   index = index + 1;
   objy(index) = str2double(C{1}{v});
end

objz = [str2double(C{1}{12})];
index = 1;
for v=24:12:endc
   index = index + 1;
   objz(index) = str2double(C{1}{v});
end

figure(1);
plot3(posx, posy, posz);
figure(2);
plot3(rotx, roty, rotz);
figure(3);
plot3(eulx, euly, eulz);
figure(4);
plot3(objx, objy, objz);

Now What I want to do is read data from 5 other files(which have similar file structure as the first one) and plot the data in graphs. How do I read multiple files and plot the data?

Answer 1

[Mario Malic]

Here's some code that you can read the data from the .txt files, I haven't seen yours so it might not work properly on it. Data_Ready returns your data as an Array, so you'll need to know what rows are for what.

%% You can use it as a function

function Data_Ready = Read_File(File_Name)
Counter = 1;
File_Name = 'results.txt'
FID = fopen(File_Name, 'rt'); 
tline = fgetl(FID);
File_Data{Counter} = tline;
while ischar(tline)
    Counter = Counter+1;
    tline = fgetl(FID);
    File_Data{Counter} = tline;
end
fclose(FID);
File_Data = File_Data';
Wanted_Rows = 1:1:length(File_Data);
% Delete_Lines = [1:13 114 115 216 217, length(File_Data)]; If you need to delete some rows
Delete_Lines = [length(File_Data)]; % Last line of File_Data is -1 which denotes end of file so we remove it here
File_Data(Delete_Lines) = [];
File_Data_Split = split(File_Data(1:length(File_Data))); % Splits the cell
Data_Ready = cellfun(@str2num,File_Data_Split);
end

If you want to plot all five files on 4 graphs, then you can read each file and join arrays with data accordingly.

[Radhika Kulkarni]

Thanks. But my code already converts the data into array and plots the graph. But my code is for single file. What I want is to plot graphs of data from multiple files. So How do I do that?

[Mario Malic]

If you want to do it that way, then exactly as you did already, copy and paste it how many times you need. There's command called "hold on" so the plot doesn't get overwritten.