?PLEASE READ IN EACH LINE AND USE EVAL ? 12. Write a script that will read from

Question

?PLEASE READ IN EACH LINE AND USE EVAL?

12. Write a script that will read from a file x and y data points in the following format: x 1.3 y 2.2 the letter 'y', space, and the y value. First, create the data file with 10 lines in this format. Do this by using the Editor/Debugger, then File Save As xypts.dat. The script will attempt to open the data file and error-check to make sure it was opened. If so, it uses a for loop and fgetl to read each line as a string. In the loop, it creates x and y vectors for the data points. After the loop, it plots these points and attempts to close the file. The script should print whether or not the file was successfully closed.

Explanation / Answer

xyplot.m

fid = fopen('xypts.dat');
if fid == -1
    disp('File open not successful')
else
    for i = (1:end)
        pn(i) = fgetl(fid);
        [x rest] = strtok(fid);
        [xcoord rest2] = strtok(rest);
        [y ycoord] = strtok(rest2);
    end
    plot(xcoord,ycoord)
close = fclose(fid);
if close == 0
    disp('File close unsuccessful')
else
    disp('File closed')
end
end

xypts.dat

x 0 y 1
x 1.3 y 2.2
x 2.2 y 6
x 3.4 y 7.4
x 4 y 6.5
x 5 y 2
x 2.2 y 1
x 5 y 9
x 4 y 6.7
x 3.2 y 8.9

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