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'Subscript indices must either be real positive integers or logicals... and they are.' Why the error?

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I keep getting the following error when I try to plot to vectors of data and it doesn't make sense to me. Does anyone know why this is happening?
x =
1.0e+04 *
3.592304700000000
3.631143000000000
3.684712000000000
3.722212000000000
3.767748400000000
3.833372000000000
3.886942000000000
3.935166400000000
4.007484799999999
4.075794999999999
>> y
y =
2.052695376905927
2.116785788400099
2.203573844584633
2.266329782184324
2.342437651581077
2.450590377072377
2.538714605463729
2.628180700403267
2.745678639284237
2.865853118409325
>> isreal(x)
ans =
1
>> isreal(y)
ans =
1
>> plot(x,y)
Subscript indices must either be real positive integers or logicals.
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