How to open and modify .dat file

7 Ansichten (letzte 30 Tage)
mohd akmal masud
mohd akmal masud am 16 Aug. 2024
Bearbeitet: Umar am 19 Aug. 2024
Hello Everyone,
Anyone can help me.
I have one .dat file as attached. According to the manual, the description of my file is 364 × 364 × 110, integer, 8-bit.
Anyone can help how to open my file.
Then how to modify some infi like the geometry.

Akzeptierte Antwort

Stephen23
Stephen23 am 16 Aug. 2024
unzip nema.zip
fid = fopen('nema.dat','rb');
arr = fread(fid,'int8');
fclose(fid);
dim = [364,364,110];
arr = reshape(arr,dim)
arr =
arr(:,:,1) = Columns 1 through 30 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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  1 Kommentar
mohd akmal masud
mohd akmal masud am 17 Aug. 2024
Bearbeitet: mohd akmal masud am 17 Aug. 2024
First, thank you for your asnwering my question. Your coding is work. the picture as below. Its good.
But what I want is, is it possible I change the shape perimeter is circle? instead of semi circle as already picture attached.
If possible, where is the data I should modify?
My expectation like this below:

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Weitere Antworten (2)

nick
nick am 16 Aug. 2024
Hi Akmal,
You can open the file using 'fread' function by following the below-mentioned steps:
  1. Open the file for binary read access using the 'fopen' function
  2. Read the data using the 'fread' function to read data from binary file
% Open the file
fileID = fopen('nema.dat', 'r');
% Read the data
data = fread(fileID, 364 * 364 * 110, 'uint8');
% Close the file
fclose(fileID);
You may refer to the following documentation to learn more about the functions 'fread' and 'fopen':
Hope this helps!
  1 Kommentar
mohd akmal masud
mohd akmal masud am 17 Aug. 2024
Bearbeitet: mohd akmal masud am 17 Aug. 2024
First, thank you for your asnwering my question. Your coding is work. the picture as below. Its good.
But what I want is, is it possible I change the shape perimeter is circle? instead of semi circle as already picture attached.
If possible, where is the data I should modify?
My expectation like this below:

Melden Sie sich an, um zu kommentieren.


Umar
Umar am 16 Aug. 2024

Hi @mohd akmal masud,

Since your data is in an 8-bit integer format, you can use the `fopen`, `fread`, and `reshape` functions. First start by specifying the name of the file you wish to read. Ensure that the file is in the current directory or provide the full path.

filename = 'your_file.dat';  % Replace with your actual file name

Now, use the fopen function to open the file in read mode. This function returns a file identifier (fid) that you will use for subsequent operations.

fid = fopen(filename, 'r');

For successful file opening, it is crucial to verify that the file has been opened successfully. If fid equals -1, it indicates an error in opening the file. In such a case, you should handle the error appropriately.

if fid == -1
    error('File cannot be opened. Check the filename or path.');
end

Now, the fread function to read the data from the file, you can use fread function. As you can see that the data is read as unsigned 8-bit integers and is structured to read a total of 364 rows and 364*110 columns.

data = fread(fid, [364, 364*110], 'uint8');  % Read as unsigned 8-bit integers

After reading the data, it is good practice to close the file using the fclose function to free up system resources.

fclose(fid);

Finally, reshape the one-dimensional array data into a three-dimensional array. The dimensions specified in the reshape function correspond to the original structure of the data.

data_3D = reshape(data, [364, 364, 110]);

To modify aspects of the geometry represented by your data (assuming you want to change dimensions or values), here are some common operations:

If you want to resize your array, you can use interpolation methods such as `imresize` from the Image Processing Toolbox:

     % Define your new dimensions
     new_size = [new_rows, new_cols, new_slices]; 
     resized_data = imresize3(data_3D, new_size);

To modify specific values based on certain conditions (e.g., thresholding), you can do so using logical indexing:

% Example: Set all values below a threshold to zero
   threshold = 50;  % Define your threshold value
   data_3D(data_3D < threshold) = 0;

Try to visualize changes made to your geometry or data structure by considering using slice or volume visualization functions:

   slice(data_3D, [], [], [1:110]);  % Visualize slices along the third dimension

Let me share some tips, when modifying data arrays, please make sure that any changes maintain the integrity of the original dataset unless intentional alterations are required for analysis. Always refer to MATLAB’s official documentation for detailed explanations of functions and their parameters. This will enhance your understanding of how each function operates and most importantly before making any modifications, it's wise to create a backup of your original data to prevent accidental loss. Also, for more information about functions used in this code, please click the names of functions.

fopen

fread

fclose

https://www.mathworks.com/help/matlab/ref/reshape.html?searchHighlight=reshape&s_tid=srchtitle_support_results_1_reshape

imresize

Hope this helps. Please let me know if you have any further questions.

  9 Kommentare
mohd akmal masud
mohd akmal masud am 19 Aug. 2024
Dear @Umar,
But why only the first slice appear. Because the original data is 110 slice right?
Umar
Umar am 19 Aug. 2024
Bearbeitet: Umar am 19 Aug. 2024

Hi @mohd akmal masud,

You are absolutely right. I was trying to demonstrate an example because of the size of data being too large. So, that is the reason that only the first slice appears when using imshow(newData(:, :, 1), []). Also, when you specify just one slice (the first one), it displays that slice alone, ignoring others in the 3D array. So, to help you visualize all slices of your transformed dataset effectively, consider using a loop or employing MATLAB’s slice function which can handle 3D data better. For more information regarding this function, please refer to

https://www.mathworks.com/help/matlab/ref/slice.html?searchHighlight=slice&s_tid=srchtitle_support_results_1_slice

Here’s how you can modify visualization code:

% Visualize all slices in a loop
figure;
for i = 1:originalDimensions(3)
    subplot(10, 10, i); % Adjust subplot grid size according to number of slices
    imshow(newData(:, :, i), []);
    title(['Slice ' num2str(i)]);
    colormap(gray); % Set colormap to gray for better visibility
end

Alternatively, if you want an interactive way to view slices:

% Using slice function for better 3D visualization
figure;
slice(newData, [], [], 1:originalDimensions(3));
colormap(gray);
title('Transformed Dataset - All Slices');

Hope this helps. If you have any more questions or require further clarification on any specific aspect of your project, feel free to ask!

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