determining what has changed

by Nate Hekman on October 16, 2007

Back with version 5 of our products (we called it “GEO-SLOPE Office” back then, but it’s the same thing as what you know as GeoStudio now), each product had its own file format.  (I think v5 was when we first introduced file zipping though, so all the results for an analysis were at least in one big file instead of creating a zillion little files to keep track of.)  In version 6 (aka GeoStudio 2004) were able to combine all products into one, letting you have a (single) SEEP/W analysis in the same file as a SLOPE/W analysis.  Version 7 (GeoStudio 2007) takes the final step, letting you have as many analyses as you want all in one file.

But with that added power comes added complexity.

GeoStudio 2007 tries to help you keep track of changes to all those analyses by indicating when an analysis may need to be re-solved.  It does that by showing a status of “solution out of date” next to some analyses in Tools – Solve Analyses.

Out of date analyses

But what really does “Solution out of date” mean?

It means that some values have changed which could affect the solution.  That’s rather vague.  Phrased another way, if you solve that analysis again, your results may be different from last time. 

More specifically, an analysis will NOT be out of date if all you’ve changed is sketch text or sketch lines, or if you changed a function or material or boundary condition that isn’t actually used by that analysis.  In the example above, I changed a material property that is obviously only used by the SLOPE/W analyses.

To find out exactly what changed, you can select an out of date analysis and click the Show Changes button.


Show Changes message

In this case I can see that I changed Phi from 34 to 33.

So what about the ‘*’ in the title bar?  What’s that?

Some people seem to confuse “solution out of date” with the “*” that shows up in the title bar from time to time.  The “*” is much dummer than the “solution out of date”.  All it means is that something (pretty much anything) has changed, so you may want to save your file.  When the “*” is there and you try to close GeoStudio, you’ll get prompted to save.  That’s all it means.  There’s no global “Show Changes” button, but if you click the arrow next to the Undo button in the toolbar you can see the last few changes that have been made.


The Undo list

I hope that demystifies how GeoStudio keeps track of changes.  Computers are not fast enough (yet!) for all your solutions to be automatically kept up to date, but with the clues you can gather from the Show Changes button you have enough information to know whether you need to solve an analysis again or leave it be.


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