MATLAB: Creating variables in a for loop

faq 4.6forfor loopvariables

I have n .xyz files that I want to load and manipulate. For each file, I want to create 3 column vectors (the x, y, and z coordinates). Is there a way to do that without writing out xn=filen(:,1) etc. for each file? My first thought was a for loop, but I'm not sure how that would work.

file1 = load('BRS_19920109.xyz');   
file2 = load('CEL_19920110.xyz');
file3 = load('MLI_19920115.xyz');
file4 = load('BIJ_19920114.xyz');
file5 = load('MHR_19920115.xyz');
file6 = load('PRE_19920115.xyz');   
%Creating vectors for x,y,z for each file.
x1 = file1(:,1);
y1 = file1(:,2);
z1 = -file1(:,3);
x2 = file2(:,1);
y2 = file2(:,2);
z2 = -file2(:,3);
%etc.

Thanks for taking a look.

Best Answer

Look at this http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

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MATLAB: Loading files with a particular string on its name

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

% Specify the folder where the files live.
myFolder = pwd; % or 'C:\Users\yourUserName\Documents\My Pictures' or whatever...
% Check to make sure that folder actually exists.  Warn user if it doesn't.
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(myFolder, 'Result*.mat'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
for k = 1 : length(theFiles)
  baseFileName = theFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  % Now do whatever you want with this file name,
  % such as reading it in as an image array with imread()
  thisStructure = load(fullFileName)
end
msgbox('Done');

Best Answer

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MATLAB: How do i plot x^2 +4y^2 +9z^2 = 1

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