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The Step() is like Interpolate() except that it finds the corresponding y for a given x from a step-function fit rather than a linear fit. Use Step() with discrete y values (that is, when the y value’s corresponding x value can be only y1 or y2). However, when the y value’s corresponding x value can fall between y1 and y2, use Interpolate().
As with Interpolate, the data points can be specified as a list:
Step( x, x1, y1, x2, y2, ... );
Step( x, xmatrix, ymatrix );
Step( 35, [25 50 75 100], [5 10 15 25] );
5
Interpolate( 35, [25 50 75 100], [5 10 15 25] );
7
As with Interpolate(), the data points must create a positive slope.

Help created on 3/19/2020