# How do I make my vector length even?

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Kalpha.mc am 25 Okt. 2020
Kommentiert: Kalpha.mc am 25 Okt. 2020
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')
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### Akzeptierte Antwort

per isakson am 25 Okt. 2020
Bearbeitet: per isakson am 25 Okt. 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)
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per isakson am 25 Okt. 2020
Bearbeitet: per isakson am 25 Okt. 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 am 25 Okt. 2020
Its not how she would want it but it's okay i already figured it out. Thank You!

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