How do I make my vector length even?

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How would i make line x vectors to be even to the rest. To form three different lines on the graph. Also how do you make the points show up with like a circle, square and x.
x = linspace(5,(-2*pi),(2*pi));
x1 = linspace((-2*pi),(2*pi),10);
x2 = linspace((-2*pi),(2*pi),20);
y = sin(x);
axis([-6, 6, 0, 1])
plot(x,y, 'r')
hold on
plot(x1,y, 'g')
hold on
plot(x2,y, 'p')
title('Plot Comparison of sin(x)')
xlabel('x values')
ylabel('sin(x)')
legend('5 points','10 points','20 points')

Accepted Answer

per isakson
per isakson on 25 Oct 2020
Edited: per isakson on 25 Oct 2020
The statement
x = linspace(5,(-2*pi),(2*pi));
looks strange to me. On R2018b it creates a row vector of length 6, which suprises me. Did you mean
x = linspace((-2*pi),(2*pi),5);
The two statements
plot(x1,y, 'g')
plot(x2,y, 'p')
will throw errors, since the length of x1 and y differs. They are 10 and 6, respectively. And the length of x2 and y also differs.
"to be even to the rest" you can do that with interp1, 1-D data interpolation (table lookup)
"points show up with like a circle, square and x" with 'o', 's' and 'x', see plot, 2-D line plot (and browse the entire page)
  3 Comments
per isakson
per isakson on 25 Oct 2020
Edited: per isakson on 25 Oct 2020
I assume this is your homework. Am I right? Thus, I provide hints.
Regarding the markers, read the documentation on plot.
interp1 is most likely not what your teacher intended.
Kalpha.mc
Kalpha.mc on 25 Oct 2020
Its not how she would want it but it's okay i already figured it out. Thank You!

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