Data is being graphed as line instead of sin wave

My x and y variables have about 964 data points each. When I plot them in excel, It just comes out linear, when it should be sinusodial. When I tried doing it in excel I did get a sinusoddial wave.

Im suspecting its because of the way my data is formated? I am exporting this data from tracker and it paste into matlab as

"time =[0.00E+00

3.33E+00

6.67E+00

1.00E+01

1.33E+01

1.67E+01

2.00E+01

2.33E+01

2.67E+01

...]" and the same for position.

Is this happening because the format of my data? Or is there something else I am doing wrong?

Answer 1

[Image Analyst]

Should be okay but it looks like you're only plotting time/x. You need to plot y/position as a function of that.

timeData = [.........
position = [....................
plot(timeData, position, 'b-', 'LineWidth', 2);
grid on;
xlabel('Time');
ylabel('Position');

Don't use "time" as the name of your variable since it's already the name of a built-in function. Call it timeData or something.