Question: Point plot from two arrays

The array is:

N := vector (20, x -> y[x]);

The maple creat the array

The other is:

N := vector (20, x -> y[x]);

Where y[x] are a list 

I do plot 

plot( M,N);

But the plot is many lines with the value of the array, i want the fist coordenates of the N with fist coordenate for the M in points or line.

Thanks 

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