2D plot of current position without traces


Recommended Posts


I'm working on my first project with DAQFactory Express and have run into an issue that I have yet to find a solution for. I have two voltages being measured by a LabJack that represent X and Y position of a laser beam on a detector. I have a 2D graph set up with each axis representing one of the voltages but i would like to see just a symbol denoting the most recent measurement. What I have is a trace of the position history which gets messy after a short while.

Is there anyway to turn off the old data and just display the most current data point with a symbol?



Link to comment
Share on other sites

Two things:

1) to limit the data being plotted, subset one of the two expressions. For example, to just display the last 100 points, add [0,99] to the end of the Y expression

2) to put a point at the end you actually have to create a second trace and put that trace on another axis (probably a right axis), setting that other axis to point instead of line. The second trace has to have two points to plot (I believe), so make the X and Y expression something like:



You also might not need two points for a point, so try just doing [0] first.

Link to comment
Share on other sites


This topic is now archived and is closed to further replies.