how to read lots of file and plot them

Hi

Dearly need your help!

I have a folder,its name is "waves".

Files name inside it are like

S(numbers from 1 to 54).L0.FX(X Y Z) for example ⇒ S46.L0.FXZ.sema

so there are 54*3=162 files in my "waves" folder.

each file has 2 columns of data, time and acceleration.

I have to read all the files for a same number and 3 X,Y,Z component and plot them in one figure

S(number).L0.FX(X).sema

S(number).L0.FX(Y).sema

S(number).L0.FX(Z).sema

I suppose to have 54 figurs.

it is just too complicated

how can i write a code that is going to read data and plot, I have no idea.

the only thing that I came up with

idir='./waves/'
files=dir([idir.'*sema'])
for i=1:numel(files)/3;
    for d=[X Y Z]
    file_name = ............
end 

please make it simple I am still studying

Thank You

[Raj]

Can you share a sample file to make things easier?

[Samaneh Arzpeima]

Sure.Please

Answer 1

[Raj]

You can use this:

for ii=1:54    % Number of S set of files
    for jj=1:3 % Number of sub files for each S index
        if jj==1
            temp='X';
        elseif jj==2
            temp='Y';
        else
            temp='Z';
        end
%% Initialize variables.
myfilename= sprintf('S%i.L0.FX%s.sema',ii,temp);
filename = fullfile('C:\','Users','user','Documents','MATLAB','waves_sample',myfilename);% Put your file path here
delimiter = ' ';
%% Format string for each line of text:
%   column1: double (%f)
%   column2: double (%f)
formatSpec = '%f%f%[^\n\r]';
%% Open the text file.
fileID = fopen(filename,'r');
%% Read columns of data according to format string.
dataArray = textscan(fileID, formatSpec, 'Delimiter', delimiter, 'MultipleDelimsAsOne', true, 'EmptyValue' ,NaN, 'ReturnOnError', false);
%% Close the text file.
fclose(fileID);
%% Allocate imported array to column variable names (NOTE: Time and Acceleration data gets overwritten with each new file read)
Time = dataArray{:, 1};
Acceleration = dataArray{:, 2};
%% Clear temporary variables
clearvars filename delimiter formatSpec fileID dataArray ans;
figure(ii)% Figure1 will be for S1 three files and so on
plot(Time,Acceleration)% customize plots here as you desire
hold on
    end
end

[ddd ppp]

did you just make that? or did you find that code somewhere? thats a lot of code for one answer. thanks for your time.

[Raj]

Well I found some part of the code online and modified it to suit this answer.

Answer 2

[KSSV]

files = dir('*.txt')    % Give your extension 
N = length(files) ;   % total number of files 
% loop for each file 
for i = 1:N
    thisfile = files(i).name ; 
    % Read the file 
    % plot the file 

end

[Samaneh Arzpeima]

Did you read my question

my file name is like

S(numbers from 1 to 54).L0.FX(X Y Z) for example ⇒ S46.L0.FXZ.sema

Your tip wont work for me

thanx for your time anyway

Answer 3

[Endu lake]

%% Import data from text file.

% Script for importing data from the following text file:

%

% /home/endu/Desktop/data/EXBDRIFT_ABJA_CMRN_2018_ONE_MNT/correl^n coff/CNKY_aBN/CNKY_ABAN_DOY_2013.txt

%

% To extend the code to different selected data or a different text file,

% generate a function instead of a script.

% Auto-generated by MATLAB on 2022/10/05 09:35:02

%% Initialize variables.

filename = '/home/endu/Desktop/data/EXBDRIFT_ABJA_CMRN_2018_ONE_MNT/correl^n coff/CNKY_aBN/CNKY_ABAN_DOY_2013.txt';

delimiter = ' ';

startRow = 2;

%% Format for each line of text:

% column1: double (%f)

% column2: double (%f)

% column3: double (%f)

% column4: double (%f)

% column5: double (%f)

% column6: double (%f)

% column7: double (%f)

% column8: double (%f)

% column9: double (%f)

% column10: double (%f)

% For more information, see the TEXTSCAN documentation.

formatSpec = '%f%f%f%f%f%f%f%f%f%f%[^\n\r]';

%% Open the text file.

fileID = fopen(filename,'r');

%% Read columns of data according to the format.

% This call is based on the structure of the file used to generate this

% code. If an error occurs for a different file, try regenerating the code

% from the Import Tool.

dataArray = textscan(fileID, formatSpec, 'Delimiter', delimiter, 'MultipleDelimsAsOne', true, 'TextType', 'string', 'HeaderLines' ,startRow-1, 'ReturnOnError', false, 'EndOfLine', '\r\n');

%% Close the text file.

fclose(fileID);

%% Post processing for unimportable data.

% No unimportable data rules were applied during the import, so no post

% processing code is included. To generate code which works for

% unimportable data, select unimportable cells in a file and regenerate the

% script.

%% Allocate imported array to column variable names

Year = dataArray{:, 1};

DOY = dataArray{:, 2};

EEJ = dataArray{:, 3};

ExB = dataArray{:, 4};

IMF = dataArray{:, 5};

Kp = dataArray{:, 6};

Sn = dataArray{:, 7};

Dst = dataArray{:, 8};

ap = dataArray{:, 9};

f10 = dataArray{:, 10};

figure

% % max(EEJ)

% stem(DOY,EEJ,'LineStyle','-.',...

% 'MarkerFaceColor','red',...

% 'MarkerEdgeColor','green')

% hold on

% stem(DOY,IMF,'LineStyle','-.',...

% 'MarkerFaceColor','red',...

% 'MarkerEdgeColor','green')

% h = stem(DOY,EEJ);

% % plot(DOY,EEJ);

% hold on

% plot(DOY,ExB);

% % hold on

% % plot(DOY,IMF);

% hold on

% plot(DOY,Sn);

% hold on

% plot(DOY,Dst);

% hold on

% plot(DOY,f10);

% subplot(511)

% R = corr2(EEJ,ExB)

% b1 = EEJ\ExB

% yCalc1 = b1*EEJ;

% scatter(EEJ,ExB,'LineWidth',3)

% hold on

% plot(EEJ,yCalc1,'LineWidth',3)

% % xlabel('EEJ(nT))','fontsize',10,'fontweight','bold')

% ylabel('ExB (m/s)','fontsize',10,'fontweight','bold')

% title('CNKY, 2013','fontsize',10,'fontweight','bold')

% % legend('Data','Linear regression','Location','best','Orientation','horizontal')

% ax.XColor = 'red';

% %

% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

% subplot(512)

%

% R = corr2(EEJ,IMF)

% b1 = EEJ\IMF

% yCalc1 = b1*EEJ;

% scatter(EEJ,IMF,'LineWidth',3)

% hold on

% plot(EEJ,yCalc1,'LineWidth',3)

% % xlabel('EEJ(nT))','fontsize',10,'fontweight','bold')

% ylabel('IMF (nT)','fontsize',10,'fontweight','bold')

% % title('2013','fontsize',10,'fontweight','bold')

% % legend('Data','Linear regression','Location','best','Orientation','horizontal')

% % % % % axis off

%

%

% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

% subplot(513)

% R = corr2(EEJ,Sn)

% b1 = EEJ\Sn

% yCalc1 = b1*EEJ;

% scatter(EEJ,Sn,'LineWidth',3)

% hold on

% plot(EEJ,yCalc1,'LineWidth',3)

% % xlabel('IMF (nT))','fontsize',10,'fontweight','bold')

% ylabel('SSN','fontsize',10,'fontweight','bold')

% % title('2013','fontsize',10,'fontweight','bold')

% % legend('Data','Linear regression','Location','best','Orientation','horizontal')

%

%

% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% subplot(514)

% R = corr2(EEJ,Dst)

% b1 = EEJ\Dst

% yCalc1 = b1*EEJ;

% scatter(EEJ,Dst,'LineWidth',3)

% hold on

% plot(EEJ,yCalc1,'LineWidth',3)

% % xlabel('IMF (nT))','fontsize',10,'fontweight','bold')

% ylabel('Dst (nT)','fontsize',10,'fontweight','bold')

% % title('2013','fontsize',10,'fontweight','bold')

% % legend('Data','Linear regression','Location','best','Orientation','horizontal')

%

%

%

% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% subplot(515)

R = corr2(EEJ,f10)

b1 = EEJ\f10

yCalc1 = b1*EEJ;

scatter(EEJ,f10,'LineWidth',3)

hold on

plot(EEJ,yCalc1,'LineWidth',3)

xlabel('EEJ (nT)','fontsize',10,'fontweight','bold')

ylabel('f10.7','fontsize',10,'fontweight','bold')

% title('2013','fontsize',10,'fontweight','bold')

legend('Data','Linear regression','Location','best','Orientation','horizontal')