There is just one external variable resistance that I'm measuring and R 2 is fixed . ( Although if there was a good reason to do it, I could make R 2 be the variable one and R 1 be the fixed resistance . talk ) 03 : 39, 29 October 2013 ( UTC)
32.
Retail Intelligence applications can relate in real time and interactively, the internal variables ( range, space, pricing, promotions, staff, sales ) with the external variables ( influence zone and its commercial mix ), with different parameters of the shopper's behavior, such as pedestrian flows and magnitudes, length of stay, occupancy, hot spots, etc.
33.
For example, a 2003 study of 82 Maryland elementary schools found, after controlling for external variables, that " the degree to which schools were working to overcome challenges to family and community involvement predicted higher percentages of students scoring at or above satisfactory on state achievement tests . " Joyce Epstein, the director of the Center on Schools, Family, and Community Partnerships is a lead researcher in the field.
34.
In the 1960s, assembly languages were developed to support library COPY and quite sophisticated conditional macro generation and preprocessing abilities, CALL to ( subroutines ), external variables and common sections ( globals ), enabling significant code re-use and isolation from hardware specifics via use of logical operators such as READ / WRITE / GET / PUT . Assembly was, and still is, used for time critical systems and often in embedded systems as it gives the most direct control of what the machine does.
35.
For example, " / lib / user "-> number _ of _ users ( ) would call the number _ of _ users ( ) function directly in the blueprint instance of / lib / user . c . ( However, a controversial mechanism in many drivers called " shadowing " allows instance methods to be emulated to some extent by permitting one object to " overlay " its function set onto another, in effect interposing itself between external function calls and the shadowed object . ) Direct external access to variables is also not supported; all interaction between objects is carried out through function calls ( notwithstanding that data structures " pointed " to by variables are independent of objects and changes to them are visible in all objects referencing those data structures simultaneously, and that some drivers have privileged functions allowing a cumbersome form of external variable access that permits inspection but not mutation ).
