📄 gslib help pfsim.htm
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<H2>GSLIB Help Page: PFSIM</H2></CENTER>
<DL>
<DT><IMG height=14 alt=o src="GSLIB Help PFSIM.files/ball.red.gif" width=14>
<STRONG>Description:</STRONG>
<UL>
<LI>The <TT>pfsim</TT> program is for simulation of categorical or
continuous variables with p-field simulation. </LI></UL>
<DT><IMG height=14 alt=o src="GSLIB Help PFSIM.files/ball.red.gif" width=14>
<STRONG>Parameters:</STRONG>
<UL>
<LI><B>vartype:</B> the variable type (1=continuous, 0=categorical)
<LI><B>idist:</B> if set to 1, then the conditional distributions are taken
to be defined by indicator thresholds. If set to 0, then the conditional
distributions are Gaussian requiring a mean and variance
<LI><B>ncat:</B> number of thresholds or categories (<B>idist</B>=1 or
<B>vartype</B>=0)
<LI><B>cat:</B> the threshold values or category codes (there should be
<B>ncat</B> values on this line of input)
<LI><B>datafl:</B> the data file containing <I>z</I>-data that provides the
details between the IK thresholds. This file is used only if table look-up
values are called for in one of the interpolation/extrapolation options.
<LI><B>icolvr</B> and <B>icolwt:</B> when either <B>ltail, middle</B> or
<B>utail</B> is 3 then these variables identify the column for the values
and the column for the (declustering) weight in <B>datafl</B> that will be
used for the global distribution.
<LI><B>zmin</B> and <B>zmax:</B> minimum and maximum data values allowed.
Even when not using linear interpolation it is safe to control the minimum
and maximum values entered. The lognormal or hyperbolic upper tail is
constrained by <B>zmax</B>
<LI><B>ltail</B> and <B>ltpar</B> specify the extrapolation in the lower
tail: <B>ltail</B>=1 implements linear interpolation to the lower limit
<B>zmin</B>; <B>ltail</B>=2 implements power model interpolation, with
<B>w=ltpar</B>, to the lower limit <B>zmin</B>; and <B>ltail</B>=3
implements linear interpolation between tabulated quantiles.
<LI><B>middle</B> and <B>midpar</B> specify the interpolation within the
middle of the distribution: <B>middle</B>=1 implements linear interpolation
to the lower limit <B>zmin</B>; <B>middle</B>=2 implements power model
interpolation, with <B>w=midpar</B>, to the lower limit <B>zmin</B>; and
<B>middle</B>=3 allows for linear interpolation between tabulated quantile
values;
<LI><B>utail</B> and <B>utpar</B> specify the extrapolation in the upper
tail of the distribution: <B>utail</B>=1 implements linear interpolation to
the upper limit <B>zmax</B>, <B>utail</B>=2 implements power model
interpolation, with <B>w=utpar</B>, to the upper limit <B>zmax</B>;
<B>utail</B>=3 implements linear interpolation between tabulated quantiles;
and, <B>utail</B>=4 implements hyperbolic model extrapolation with
<B>w=utpar</B>.
<LI><B>distfl:</B> input data file with the conditional distributions.
<LI><B>imean</B> and <B>ivar:</B> columns for the Gaussian ccdf means and
variances (<B>idist</B>=0) or the ccdf values (<B>idist</B>=1).
<LI><B>tmin</B> and <B>tmax:</B> all values strictly less than <B>tmin</B>
and strictly greater than <B>tmax</B> are ignored.
<LI><B>pfile:</B> file containing the input p-field probability realizations
<LI><B>icolp:</B> column number in <B>pfile</B> for the p-field probability
value.
<LI><B>pflag:</B> if set to 0, then the p-field probability values are taken
to be Gaussian deviates that need to be converted to cumulative probability
values. If set to 1, then the p-field probability values are already
cumulative distribution values between 0 and 1.
<LI><B>outfl:</B> the output grid is written to this file. The output file
will contain the results, cycling fastest on <I>x</I>, then <I>y</I>, then
<I>z</I>, then simulation by simulation.
<LI><B>nsim:</B> number of realizations
<LI><B>nx, ny,</B> and <B>nz:</B> size of the simulation grid A short
description of the program </LI></UL></DT></DL><IMG height=8 alt=---
src="GSLIB Help PFSIM.files/line.blue.gif" width=652>
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