Whats the relation between cost per yard and run length?

cost per yard is a mechanical usage of measurement used for construction while run length is usually used in coding.

Explanation:

While it may be used it construction the concept of a run length is usually reserved for the usage of programming where it is the total running of a program accounted for in the pricing

Cost per yard is a measurement of area covered in a construction and cost of the material that would be used to cover the same area. Here the variable would be the availability and the cost of the material being talked about.