When i plot a 2D plot and then try to label the axis only the label appears and the graph disappear

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Hi everyone,
Im very new to matlab and im trying to learn from "getting started with matlab" . I have successfully plotted a 2-D sinusoid plot, but when i try to plot the axis, the graph disappears and the axis is plotted against a blank plot.
The same thing happens when i use ' hold on ' function. A blank plot appears after i use hold on.
x = linspace(0,2*pi);
y = sin(x);
plot(x,y)
hold on
y2 = cos(x);
plot(x,y2,":")
legend("sin","cos")
hold off
This is code im tring to use. Can anyone please explain what im doing wrong.

采纳的回答

Gabriel Quattromani
Use 1 line to plot both graphs, as such:
x = linspace(0,2*pi);
y = sin(x);
y2 = cos(x);
plot(x,y,x,y2,":")
legend("sin","cos")

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