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# Rarely Used Compilation Options

The following definitions are found in nrnoc/SRC/options.h and add extra functionality which not everyone may need. The extras come at the cost of larger memory requirements for node and section structures. METHOD3 is too large and obscure to benefit most users.

    #define VECTORIZE   1       /* hope this speeds up simulations on a Cray */
                                /* this is no longer optional */

    #define EXTRACELLULAR       1       /* extracellular membrane mechanism */

    #define DIAMLIST    1       /* section contains diameter info */
                                /* shape plots make use of this */

    #define EXTRAEQN    0       /* ionic concentrations calculated via
                                 * jacobian along with v (not implemented) */
    #if DIAMLIST
    #define NTS_SPINE   1       /* A negative diameter in pt3dadd() tags that
                                 * diamlist location as having a spine.
                                 * diam3d() still returns the positive diameter
                                 * spined3d() returns 1 or 0 signifying presence
                                 * of spine. setSpineArea() tells how much
                                 * area/spine to add to the segment. */
    #endif

    #define METHOD3             1       /* third order spatially correct method */
                                /* testing only, not completely implemented */
                                /* not working at this time */

    #if METHOD3
     spatial_method(i)
        no arg, returns current method
        i=0 The standard NEURON method with zero area nodes at the ends
                of sections.
        i=1 conventional method with 1/2 area end nodes
        i=2 modified second order method
        i=3 third order correct spatial method
        Note: i=1-3 don't work under all circumstances. They have been
        insufficiently tested and the correctness must be established for
        each simulation.
    #endif

    #if NEMO
    neuron2nemo("filename") Beginning of translator between John Millers
                nemosys program and NEURON. Probably out of date.
    nemo2neuron("filename")
    #endif

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