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The SIM2D Procedure

Syntax

The following statements are available in PROC SIM2D.

PROC SIM2D options ;
COORDINATES coordinate-variables ;
GRID grid-options ;
SIMULATE simulate-options ;
MEAN mean-options ;

The SIMULATE and MEAN statements are hierarchical; you can specify any number of SIMULATE statements, but you must specify at least one. If you specify a MEAN statement, it refers to the preceding SIMULATE statement. If you do not specify a MEAN statement, a zero mean model is simulated.

You must specify a single COORDINATES statement to identify the x and y coordinate variables in the input data set when you perform a conditional simulation. You must also specify a single GRID statement to specify the grid information.

The following table outlines the options available in PROC SIM2D classified by function.

Table 58.1: Options Available in the SIM2D Procedure
Task Statement Option
Data Set Options  
specify input data setPROC SIM2DDATA=
specify grid data setGRIDGDATA=
specify quadratic form data setMEANQDATA=
write simulated valuesPROC SIM2DOUTSIM=
Declaring the Role of Variables  
specify the conditioning variableSIMULATEVAR=
specify the x and y coordinate variables in the DATA= data setCOORDINATESXC= YC=
specify the x and y coordinate variables in the GDATA= data setGRIDXC= YC=
specify the constant coefficient variable in the QDATA= data setMEANCONST=
specify the linear x coefficient variable in the QDATA= data setMEANCX=
specify the linear y coefficient variable in the QDATA= data setMEANCY=
specify the quadratic x coefficient variable in the QDATA= data setMEANCXX=
specify the quadratic y coefficient variable in the QDATA= data setMEANCYY=
specify the quadratic xy coefficient variable in the QDATA= data setMEANCXY=
Controlling the Simulation  
specify the number of realizationsSIMULATENUMREAL=
specify the seed value for the random generatorSIMULATESEED=
Controlling the Mean Quadratic Surface  
specify the CONST termMEANCONST=
specify the linear x termMEANCX=
specify the linear y termMEANCY=
specify the quadratic x termMEANCXX=
specify the quadratic y termMEANCYY=
specify the quadratic cross termMEANCXY=
Controlling the Semivariogram Model  
specify a nugget effectSIMULATENUGGET=
specify a functional formSIMULATEFORM=
specify nested functional formsSIMULATEFORM=(f1, ... ,fk)
specify a range parameterSIMULATERANGE=
specify nested range parametersSIMULATERANGE=(r1, ... ,rk)
specify a scale parameterSIMULATESCALE=
specify nested scale parametersSIMULATESCALE=(s1, ... ,sk)
specify an angle for an anisotropic modelSIMULATEANGLE=
specify nested anglesSIMULATEANGLE=(a1, ... ,ak)
specify a minor-major axis ratio for an anisotropic modelSIMULATERATIO=
specify nested minor-major axis ratiosSIMULATERATIO=(ra1, ... ,rak)


PROC SIM2D Statement

COORDINATES Statement

GRID Statement

SIMULATE Statement

MEAN Statement

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