How to ya add methods to Swarm objects?

[Steve Emsley]

I installed the archive Swarm rather than the bin Swarm because I
wanted to add a method to the Histogram object. Although Graph allows
one to fix the Y axis, Histogram does not.

Naively, I added a prototype:

- setYaxisMin: (double)min max: (double)max step: (double)step;

in Histogram.h and the method in Histogram.m. I made it and installed
it. However, when I tried to make my model I got the compiler message:

method `setYaxisMin:max:step:' not implemented by protocol.

So:
1. Where do I add the new method to the list of protocols?
2. Doing 'make install' seems an inefficient way of introducing a new
method into the Swarm libraries. What should I be doing?
3. Am I doing this all wrong anyway?

Suggestions much appreciated,
Steve
-- 
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 Steve Emsley                 Ecosystems Analysis & Management Group
 address@hidden              University of Warwick, England
 http://www.oikos.warwick.ac.uk/~sme/           (+44) (0)1598 753648
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