Combining several files with 18 by 18 matrix in each file into one single file with one single column

Question

Ray 2015-9-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/242975-combining-several-files-with-18-by-18-matrix-in-each-file-into-one-single-file-with-one-single-colum

评论： Walter Roberson 2015-10-5

Hello all,

I have several .mat files each .mat file contains 18 by 18 data files. I am trying to combine each of the 18 by 18 matrix into one single column. After that, i want to combine all the single column files into one file with one single file.

Below is my code but i have a problem on this line:

data.reshapedData(p) = reshape((matData{k}.rawdata),324,1);

---

myFolder = '/Users/redhwanmawari/Documents/MATLAB/2DimenstionalTestingGT20150907/LOS0dbm15ft_finalData'; % Define your working folder
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(myFolder, '*.mat');
matFiles = dir(filePattern);
%for k = 1:length(matFiles)
p=1;
 for k = 1:5   
  baseFileName = matFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  %matData(k) = load(fullFileName);
  matData{k} = load(fullFileName);
  data.reshapedData(p) = reshape((matData{k}.rawdata),324,1);
%   p=p+324;
end

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Ray 2015-10-5

Hi, I am trying to do a 3D plot for 18 by 18 matrix containing a first structure "positions" (x,y coordinates), and a second structure containing "power" in db. I have about 20 files with the position and power structures in each file. I took all the positions from each file and put them in one single structure and the power in another structure. However, the positions repeat after 324 rows (18 X18 = 324). when i tried to plot, i got weird plot. Not sure why, but i am thinking when the positions repeat, the graph does not look right. below is the code i used to do the plot.

load('combine.mat');

Pow=positions.offsetdata;

Pos=[]; for i=1:length(power.positions); Poss=power.positions{i,1}; Pos=[Pos;Poss']; end

figure plot3(Pos(:,1),Pos(:,2),Pow)

Walter Roberson 2015-10-5

You started a new Question for this and I have answered there.

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Answer 1

Walter Roberson 2015-9-15

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/242975-combining-several-files-with-18-by-18-matrix-in-each-file-into-one-single-file-with-one-single-colum#answer_192347

在 MATLAB Online 中打开

for k = 1:5
  baseFileName = matFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  matData{k} = load(fullFileName);
  data.reshapedData(:,:,k) = matData{k}.rawdata;
end
data.reshapedData = data.reshapedData(:);

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Walter Roberson 2015-9-15

在 MATLAB Online 中打开

The line

data.reshapedData(:,:,k) = matData{k}.rawdata;

takes the current matrix and writes it in as slice #k of data.reshapedData.

The line

data.reshapedData = data.reshapedData(:);

is equivalent to

data.reshapedData = reshape( data.reshapedData, numel(data.reshapedData), 1);

which is to say it creates a single column out of all of the data in the matrix, by treating the data column by column for the first slice, then all the columns for the second slice, and so on.

Ray 2015-9-15