Galaxy Users,

I have a workflow where I’d like the user to input a value once, say a number of nucleotides. That value would then be used as an input parameter to several different tasks, for example, to two instances of “Operate on Genomic Intervals > Get flanks” , where it would be used both for the “offset” and “length of flanking regions(s)” in one instance, and it’s value and it’s *negative* would be used for the second instance.

Thus, the user inputs “20”, and Get_flanks(20,20) and Get_flanks(-20,20) get run.

For this workflow, it’s important that those parameters all be of the same magnitude, or things will get messy later, so I don’t want the user having to input them separately, or to have to remember which one gets negated…

All suggestions welcome,

Curtis