Display data from file

[Youri]

Hello,

I want to display measurement data from a file on the sreen (using a chart or graph). De data file is created by a measurement system, and in a binary format. It contains a header, samplenumbers and sample data from various channels. After i split the data in the various channels, i want to display all data from a channel in a grapgh and let the user scroll, zoom in, zoom out etc (using the graph/chart palette). My problem is that the data set can be quite large (over 150 million samples). Can labview handle these amount of data points and if so, how can i best handle/display them?

Thanks in advance,

Youri

[GerdW]

Hi Youri,

you better don't display 150,000,000 samples in a chart... Using SGL datatype this will be 600MB of data and each indicator is having it's own data copy...

Take this approach:
pick only the data you want to display from your huge array. To do so you need to make your own scrolling/magnification routines... Also think of: a usual chart or graph is maybe 800 pixels wide. You cannot display (much) more points on this graph than those 800 pixels...

There are older threads handling the same problem of displaying huge data arrays on limited space chart/graph indicators.

[DFGray]

There is a tutorial that answers this question.  You can do it.  I have "plotted" 500 million points in LabVIEW.  Check out Managing Large Data Sets in LabVIEW.