Filter or Window function from the analysis Library

[oldvaxguy]

Friends,  

I will be collecting about 20,000 data points.  I would like to reduce the number of points to plot to about 300 to 500 points.  (i call this filtering)   I know there is an Advanced Analysis Library function that would do this;  which one would be the best?  

Dave    

[Wolfgang]

Hi,

one possibility without even using the Advanced  Analysis Library is to use the 'point frequency' parameter in PlotXY:

PlotXY ( plot_handle, graph_control, x_array, y_array, 20000, VAL_DOUBLE, VAL_DOUBLE, VAL_THIN_LINE, VAL_EMPTY_SQUARE, VAL_SOLID, 40, VAL_RED); this would plot every 40th point out of your 20000 data points.

[Wolfgang]

Hi,

if you want to use your decimated number of points for other purposes as well, not just for plotting, you could use an extra function from the AAL: Decimate (), which can simply reduce the number of data points, or reduce them with averaging.

Wolfgang