# Extended IDL Help

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**Last modified: **Sun Jun 11 15:19:57 2006.

# List of Routines

# Routine Descriptions

## DIMENSIONLESS_SPDE

[List of Routines]
NAME:
dimensionless_spde
PURPOSE:
Compute a numerical solution to the 1-dimensional SPDEs
from Kramer, Szeri, Kirsch, Szeri, JCN, in press.
CATEGORY:
CALLING SEQUENCE:
d=dimensionless_spde(N, dt, L, dl, Gamma_e, pee_in, alpha=alpha, read=read, write=write)
INPUTS:
N: The number of time steps to take. (Suggested = 10000)
dt: The dimensionless temporal step size. (Suggested = 0.0025)
L: The number of spatial points. (Suggested = 50)
dx: The dimensionless spatial step size. (Suggested = 0.05)
Gamma_e: The value of the parameter Gamma_e. (Typical = 1.42e-3)
P_ee: The value of parameter P_ee. (Typical = 11.0)
KEYWORDS:
ALPHA: If this keyword is set to a nonzero value, then set the parameters
controlling the strength of stochastic input to the cortex to:
alpha_ee = alpha_ei = alpha_ie = alpha_ii = ALPHA.
Otherwise, there is NO noisy input to the cortex
(i.e., alpha_ee = alpha_ei = alpha_ie = alpha_ii = 0.0)
READ: If this keyword is set, then read in the initial coniditions
for the model variables from the file:
input_output_path+'ic_dimensionless.dat'
WRITE: If this keyword is set, then write out the model variables at
the final time step (N-1) to the file:
input_output_path+'ic_dimensionless.dat'
COMMON BLOCKS:
None.
SIDE EFFECTS:
When the keyword WRITE is set, a text file is created at:
input_output_path+'ic_dimensionless.dat'
EXAMPLE:
d = dimensionless_spde(10000, 0.0025, 50, 0.05, 1.42e-3, 11.0)
d = dimensionless_spde(10000, 0.0025, 50, 0.05, 1.42e-3, 11.0, /write)
d = dimensionless_spde(10000, 0.0025, 50, 0.05, 1.42e-3, 11.0, alpha=0.02, /read, /write)
MODIFICATION HISTORY:
June 9, 2006, Mark Kramer, Boston University.

**(See ~/research/STOCH/code/dimensionless_spde.pro)**