matplotlib.colors.makeMappingArray(N, data, gamma=1.0)
Create an N -element 1-d lookup table
data represented by a list of x,y0,y1 mapping correspondences. Each element in this list represents how a value between 0 and 1 (inclusive) represented by x is mapped to a corresponding value between 0 and 1 (inclusive). The two values of y are to allow for discontinuous mapping functions (say as might be found in a sawtooth) where y0 represents the value of y for values of x <= to that given, and y1 is the value to be used for x > than that given). The list must start with x=0, end with x=1, and all values of x must be in increasing order. Values between the given mapping points are determined by simple linear interpolation.
Alternatively, data can be a function mapping values between 0 - 1 to 0 - 1.
The function returns an array "result" where
result[x*(N-1)] gives the closest value for values of x between 0 and 1.
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