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Contents → Writing User Functions → Compiling user functions → Data generation

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These are the routines you provide that will be called by the overhead module routines.

Name   What it Does   setup()   Called once each time user function is invoked   user(x)   Returns value for y in a type 1 function   user_x(t)   Returns value for x in a type 2 function   user_y(t)   Returns value for y in a type 2 function   user_sx(t)   Returns value for r in a type 2 function   user_sy(t)   Returns value for s in a type 2 function   user_x(x, y, r, s)   Returns value for x in a type 3 function   user_y(x, y, s)   Returns value for y in a type 3 function   user_sx(x, y, s)   Returns value for r in a type 3 function   user_sy(x, y, r, s)   Returns value for s in a type 3 function   user_4()   Called once in a type 4 function

In 3D mode, replace r with z.

All the functions except setup() return values of type double. The arguments are all of type double. All but user4() are called once for each data point. The argument t is the parametric variable in the type 2 user functions. Otherwise, the arguments are the values of the appropriate coordinate of the current data point. In type 2 and 3 user functions, if you wish to keep the current value of a coordinate, simply return the argument.

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