topic Re: Two kinds of graphs, shared/common axis? in Graphics Programming

Two kinds of graphs, shared/common axis?

TimH — Sat, 15 Mar 2014 20:21:17 GMT

Can SGPANEL or SGRENDER be used to put two graphs on a page that _share_ an axis?

Here's what I would like to do: I have a variable which changes during the day, different values for each category, so I am doing an area chart to show that. The variations depend upon different processes which are happening, for which I have the start and end times. I would like to share the horizontal axis which will be 24 hours with a tick each quarter hour, on top I want the area chart, below I want to do a horizontal high-low chart with the categories on the vertical axis being the process identifiers, and the bars representing the duration of the process.

Re: Two kinds of graphs, shared/common axis?

Jay54 — Sat, 15 Mar 2014 20:30:24 GMT

Yes, you can build a GTL template with two graphs and common X axis. There are many examples, and you can customize to your needs. Here are a couple of examples from the support page:

35171 - Histogram with Normal and Kernel Density Curves

35040 - Monthly Stock Price and Volume Graph

Re: Two kinds of graphs, shared/common axis?

TimH — Mon, 17 Mar 2014 13:19:02 GMT

Those are helpful, and I will do more reading about templates but not quite what I was asking. The examples show multiple charts from on dataset. I actually have two datasets; one for the upper chart - the dataset containing the variable I am doing the area chart for - and one for the lower chart - the start/stop time of the processes. Since the variable which changes during the day is measured at regular intervals, and the start/stop times of the processes do not conform to those intervals, I do not think I can merge the two datasets .

Re: Two kinds of graphs, shared/common axis?

Jay54 — Mon, 17 Mar 2014 13:40:10 GMT

The procedure only supports one data set per graph. So, you have to merge the data. It is OK to have two columns (X & Y) for the upper graph and two different columns (X2, Y2) for the lower. As long as X and X2 are of the same type, the axes can be merged by the graph. We do that with the survival plot. The survival graph is with x=Time and the lower at risk table graph is using x=TAtTisk.