Modify the script from the previous problem. Assume that the data file is in exactly that format, but do not assume that the number of lines in the file is known. Instead of using a for loop, loop until the end of the file is reached

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Ch9Ex13.m

%Read data points from "xypts.dat" and plot

fid = fopen('xypts.dat');

if fid == -1

 disp('File open not successful')

else

 %Initialize counter variable

 i = 0;

 while feof(fid) == 0

 aline = fgetl(fid);

 %Separate each line into two parts: x and y

 [x, rest] = strtok(aline,'y');

 x(1:2) = []; %Removes the "x" and the space

 [let, y] = strtok(rest);

 i = i + 1;

 xvec(i) = str2num(x);

 yvec(i) = str2num(y);

 end

 plot(xvec,yvec,'ko')

 xlabel('x')

 ylabel('y')

 title(sprintf('Number of data points: %d',i))

 

 %Error-check file close

 closeresult = fclose(fid);

 if closeresult == 0

 disp('File close successful')

 else

 disp('File close not successful')

 end

end

Medical organizations store a lot of very personal information on their 

patients. There is an acute need for improved methods of storing, 

sharing, and encrypting all of these medical records. Being able to 

read from and write to the data files is just the first step.

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