How to save data on a graph and then add new data to it

Question

i am currently plotting data on a graph from a physical system. However when i want to add new data to the plot, the old one is replaced. I am trying to do more than one plot on the same graph, where the incoming data is at different times. I want something like Excel where i can just add a new plot to the graph.Can i save the data or freeze it onto the graph or something so that i can add a new plot and see the two at the same time?

Answer 1

> i am currently plotting data on a graph from a physical system.
> However when i want to add new data to the plot, the old one is
> replaced. I am trying to do more than one plot on the same graph,
> where the incoming data is at different times. I want something like
> Excel where i can just add a new plot to the graph.Can i save the data
> or freeze it onto the graph or something so that i can add a new plot
> and see the two at the same time?
As the other post pointed out, there are two objects in LV for plotting,
graphs and charts. If you wish to have a chart recorder that
accumulates data into one or more plot with time, you probably want a chart.
If you push a button and acquire a trace and want to add that to your
graph, you just need to
combine it with the data you plotted before and
update the graph. It isn't the most efficient, but you can easily read
the value of the graph using a local, add another row or column or
element to your data and send it to the graph.
To directly answer your other question, no, the grah doesn't have a
functional interface for clearing, adding, or deleting plots. Instead,
you do that with the diagram nodes and give the graph the results.
Greg McKaskle