Smooth g Delete large spikes

Deletes spikes on all selected data sets. For single spikes it might be faster to use the delete data points option in the "Edit" menu, but for a plot with many spikes this function can be very handy.

You have to define:

• The maximum Y value: all points that exceed this value will be discarded.

• The minimum Y value: all points that are lower than this value will be discarded.

• The maximum Y value percentage increase: all points on a plot that are higher than x% of the previous point will be discarded. So a value of 200% means that the next point cannot be more than twice as high as the previous point.

• The minimum Y value percentage decrease: all points on a plot that are x% lower than the previous point will be discarded. So a value of 50% means that the next point cannot be less than half the value of the previous point.

This function will not change the number of data points in a plot. When an invalid value is encountered (the "spike") the program will search within the plot for the nearest valid value. When this is found, the program will draw a line between the last valid point and the next valid point, and place all the "out of spec" points on that line. 

When you first draw a rectangle, only the data points which fall within the rectangle are processed.