matrix - How to find the distance of two lists?

I have two lists as the following:

ab = {1, -1, -1, -1, 1, 1};
ac = {1, -1, -1,  1, 1, 1};

How I can find the difference (more precisely, the edit distance) between them? In this case the result should be 1, since there is one item difference between ab and ac.

Note: in my case, the list elements only take the values 1 and -1, and both lists are one-dimensional of the same length, but it is always nice to see more general solutions (elements are of Reals, lists are matrices, etc.).

Thank you.

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plotting - Plot 4D data with color as 4th dimension

I have a list of 4D data (x position, y position, amplitude, wavelength). I want to plot x, y, and amplitude on a 3D plot and have the color of the points correspond to the wavelength. I have seen many examples using functions to define color but my wavelength cannot be expressed by an analytic function. Is there a simple way to do this? Answer Here a another possible way to visualize 4D data: data = Flatten[Table[{x, y, x^2 + y^2, Sin[x - y]}, {x, -Pi, Pi,Pi/10}, {y,-Pi,Pi, Pi/10}], 1]; You can use the function Point along with VertexColors . Now the points are places using the first three elements and the color is determined by the fourth. In this case I used Hue, but you can use whatever you prefer. Graphics3D[ Point[data[[All, 1 ;; 3]], VertexColors -> Hue /@ data[[All, 4]]], Axes -> True, BoxRatios -> {1, 1, 1/GoldenRatio}]

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