ms.diffbuffer - Function

Differentiate or difference the internal buffer.

Synopsis
diffbuffer(direction, window)

Arguments

direction	choose between time or channel direction
	Allowed:	String: TIME or CHANNEL
window	width of averaging window in timeslots or channels
	Allowed:	Positive integer

Returns
Record, with statistics over the buffer if all went well

Description
Subtract the previous point from each data point in the buffer (for window=2), or subtract the average over a window (for window>2) from each point. The window can be in the time / row direction or the frequency / channel direction. The input data can be float or complex but the output is always float. The function returns statistics over the buffer: median for each time and channel, the average absolute deviation from the median in time and channel direction and over all pixels.

Example

myms:=ms("3C273XC1.MS");
myms.select([antenna1=3]);
myms.fillbuffer("DATA");
myms.diffbuffer("TIME",15)

We open the MS for reading, select a subset and then read the DATA, FLAG and FLAG_ROW column, we then subtract the average over a 15 point time-window from each data point.

Next: ms.getbuffer - Function Up: ms - Tool Previous: ms.fillbuffer - Function Contents Index

	Package	general
	Module	ms
	Tool	ms