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read specific values and ignore them using fread

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Nick Vasilakis
Nick Vasilakis am 31 Mär. 2022
Kommentiert: Nick Vasilakis am 31 Mär. 2022
Hello!
So I'm trying to find a way to read from a matrix of size 1x2000 the values that are assigned in positions 750 to 834 using the fread command.
Basically I open the given file that I want to read,using the command:
fid=fopen('Alien_Message');
im_1=fread(fid,251,'uint8'); %read the main header of the file and the line header and toss them away
im_2=fread(fid,[],'uint8'); %This is the part where I want to read the 750 to 834 bitstream and toss them away
Any idea on how can I manage this?

Akzeptierte Antwort

yanqi liu
yanqi liu am 31 Mär. 2022
yes,sir,may be use loop to make it,but the result should be check,such as
fid=fopen('Alien_Message');
im_1=fread(fid,251,'uint8'); %read the main header of the file and the line header and toss them away
im_2 = [];
for i = 1 : 834
tmp = fread(fid,1,'uint8');
if i >= 750
im_2 = [im_2 tmp];
end
end
  3 Kommentare
Nick Vasilakis
Nick Vasilakis am 31 Mär. 2022
I can't load the file to the forum because the website does not give me the permission. Yet, this is the graph that I use to recompose the
Nick Vasilakis
Nick Vasilakis am 31 Mär. 2022
if i run the program giving im_raw the dimension that I see from workspace (1743,1) it returns me this error:
Index in position 1 exceeds array bounds. Index must not exceed 1.
Error in den_katalabainw_xristo (line 98)
im=im_raw(1743,1); %here are supposed to be entered the values of the final matrix for the image

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