Add figure to .txt file using fprintf

I'm writing my semester gpa and cumulative gpa to a .txt file for each semester for fun/records. I have it all done but decided I needed a plot to show the trends of my gpa. I was wondering if there was a way to write the figures into the .txt from matlab using fprintf.

[KSSV]

figures you mean plots?

[Justin Western]

I assumed it was interchangable and didn't need clarification, but yeah plots.

Answer 1

[Sulaymon Eshkabilov]

Hi Justin,

You can try this script with dlmwrite() for RGB images in jpg/jpeg/png... etc:

clearvars; close all
MM = imread('GPA.jpeg');  % Original image
R = MM(:,:,1);  % Red color layer
G = MM(:,:,2);  % Green color layer
B = MM(:,:,3);  % Blue color layer
figure(1)
imshow(MM)

% Write the read image data (three layers) into (three) external *.txt files
dlmwrite('MY_R.txt', R, 'delimiter', '\t', 'precision', 0); 
dlmwrite('MY_G.txt', G, 'delimiter', '\t', 'precision', 0); 
dlmwrite('MY_B.txt', B, 'delimiter', '\t', 'precision', 0); 

% Test: load and convert to uint8 integer format 
RED = load('MY_R.txt');
GRE = load('MY_G.txt');
BLU = load('MY_B.txt');
MMnew(:,:,1)=uint8(RED);
MMnew(:,:,2)=uint8(GRE);
MMnew(:,:,3)=uint8(BLU);

% Compare the re-imported data with the original
figure(2)
imshow(MMnew)

This works quite well but a bit slow. Its processing time very much depends on the size/resolution of the image that you are working with.

Note that dlmwrite() is slow and not recommended to write matrices to ASCII-delimited file. Instead, writematrix() is recommended. But my MATLAB package does not have that function and thus, I can't state how far it is applicabale in your case.

Good luck.

[Justin Western]

Hi Sulaymon,

Sorry it took so long but thank you that answered my questions!

thanks again

Answer 2

[Sulaymon Eshkabilov]

Hi,

It is possible to do it.

(1) If you shall save your plot as *.jpg, jpeg, *.tiff, *.... etc. image file;

(2) you shall read it via imread();

(3) now, you can export/write your read data in MATLAB into *.dat, *.txt, *.xls, ... etc file formats using fprintf(), dlmwrite(), xlswrite(), ...

Good luck.

[Justin Western]

This is what I tried:

semester = imread('GPA_Semester.tif');
cumulative = imread('Cumulative_GPA.tif');
fprintf(M,'%s',semester);

but when I try to open the *.txt file it says "Text encoding Unicode (UTF-8) isn’t applicable." I'm using a mac, could that be the issue, or maybe the fprintf() formatting operator is wrong?