0
Write a script that will read x and y data points from a file, and will
create an area plot with those points. The format of every line in the
file is the letter ‘x’, a space, the x value, space, the letter ‘y’, space,
and the y value. You must assume that the data file is in exactly that
format, but you may not assume that the number of lines in the file is
known. The number of points will be in the plot title. The script loops
until the end of file is reached, using fgetl to read each line as a string.
For example, if the file contains the following lines,
x 0 y 1
x 1.3 y 2.2
x 2.2 y 6
x 3.4 y 7.4
when running the script, the result will be as shown in the Figure.
Figure Area plot produced from x, y data read as strings from a file
Matlab
Ch12Ex2.m
% Read x and y coordinates of points from a data file
% and plot them using an area plot
x = [];
y = [];
fid = fopen('xandypts.dat');
if fid == -1
disp('File open not successful')
else
while ~feof(fid)
aline = fgetl(fid);
[letter, rest] = strtok(aline);
[xval, rest] = strtok(rest);
[letter, rest] = strtok(rest);
yval = strtok(rest);
x = [x str2num(xval)];
y = [y str2num(yval)];
end
area(x,y)
title(sprintf('%d data points',length(x)))
fclose(fid);
end
need an explanation for this answer? contact us directly to get an explanation for this answer