About Case Study Relations
Relations pass information from the notebook to the case study. Case study relations have specific functionality:
• When you add relations to the Relations dialog box, units appear in two formats:
◦ Dimensions are labeled d1, d2, d3, and so forth.
◦ Entity lengths, coordinate systems, and points are labeled as e1, e2, e3, and so forth.
• You can write relations for procedures on entity lengths using the notation elen(#). For example, to add the length of sides e1, e2, and e3, enter:
length=elen(1)+elen(2)+elen(3)
• You can write relations for procedures on the X and Y distance between the first coordinate system sketched to another coordinate system or point using the notation ecoord[x or y](#). For example, to compute hyp, the shortest distance between the first coordinate system sketched and a point labeled e1, enter:
hyp=sqrt(ecoordx(1)*ecoordx(1)+ecoordy(1)* ecoordy(1))
In a notebook, you can include free notes with embedded relation symbols from a case study by using an ampersand (&) before the symbol. For example, you could include a relation that would extract the value for length, previously defined in the case study, and add it to the notebook:
TOTAL LENGTH= &length