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| The SIM2D Procedure |
The following statements are available in PROC SIM2D.
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 set | PROC SIM2D | DATA= |
| specify grid data set | GRID | GDATA= |
| specify quadratic form data set | MEAN | QDATA= |
| write simulated values | PROC SIM2D | OUTSIM= |
| Declaring the Role of Variables | ||
| specify the conditioning variable | SIMULATE | VAR= |
| specify the x and y coordinate variables in the DATA= data set | COORDINATES | XC= YC= |
| specify the x and y coordinate variables in the GDATA= data set | GRID | XC= YC= |
| specify the constant coefficient variable in the QDATA= data set | MEAN | CONST= |
| specify the linear x coefficient variable in the QDATA= data set | MEAN | CX= |
| specify the linear y coefficient variable in the QDATA= data set | MEAN | CY= |
| specify the quadratic x coefficient variable in the QDATA= data set | MEAN | CXX= |
| specify the quadratic y coefficient variable in the QDATA= data set | MEAN | CYY= |
| specify the quadratic xy coefficient variable in the QDATA= data set | MEAN | CXY= |
| Controlling the Simulation | ||
| specify the number of realizations | SIMULATE | NUMREAL= |
| specify the seed value for the random generator | SIMULATE | SEED= |
| Controlling the Mean Quadratic Surface | ||
| specify the CONST term | MEAN | CONST= |
| specify the linear x term | MEAN | CX= |
| specify the linear y term | MEAN | CY= |
| specify the quadratic x term | MEAN | CXX= |
| specify the quadratic y term | MEAN | CYY= |
| specify the quadratic cross term | MEAN | CXY= |
| Controlling the Semivariogram Model | ||
| specify a nugget effect | SIMULATE | NUGGET= |
| specify a functional form | SIMULATE | FORM= |
| specify nested functional forms | SIMULATE | FORM=(f1, ... ,fk) |
| specify a range parameter | SIMULATE | RANGE= |
| specify nested range parameters | SIMULATE | RANGE=(r1, ... ,rk) |
| specify a scale parameter | SIMULATE | SCALE= |
| specify nested scale parameters | SIMULATE | SCALE=(s1, ... ,sk) |
| specify an angle for an anisotropic model | SIMULATE | ANGLE= |
| specify nested angles | SIMULATE | ANGLE=(a1, ... ,ak) |
| specify a minor-major axis ratio for an anisotropic model | SIMULATE | RATIO= |
| specify nested minor-major axis ratios | SIMULATE | RATIO=(ra1, ... ,rak) |
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