Routine Name:
setupgate
Description:
Sets up the internal tables of tabgate or table elements,
based on a generic equation describing the values of the
entries.
Usage:
setupgate channel-element table A B C D F -size n \
-range min max -noalloc
channel-element
gate
This must be a tabgate or a table
The name of the table (must be
alpha or beta for tabgates, "table" for
table elements)
A-F
Coefficients A to F of the table
equation (see below).
-size n
Number of divisions in the table
(default = 3000).
-range min max
Range of the table (default: min = -
0.100;
max = 0.050).
-noalloc
used to prevent allocation of the table
when the table has already been allocated
with a call to TABCREATE or a previous use
of setupgate
This routine makes it easy to set up the internal tables
of
tagate or table elements when the equations describing them
are of the form:
y(x) = (A + B * x) / (C + exp((x + D) / F))
setupgate calls the TABCREATE action of the element
to allocate tables with n divisions (n + 1 entries)
representing x values from min to max. It then evalutes the
functions at these points to fill the tables.
Example:
Notes:
see Scripts/neurokit/prototypes/newbulbchan.g
The setupgate routine may not be used on tabchannels.
The state equation described above has a removable
singularity
when C = -1 at the point x = -D. common case). In this case
the routine may generate inaccurate results due to roundoff
errors.
See also:
setupalpha, setuptau, Tables