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Specifies the operator to be used in the formula. The options are as follows:
| Operator | Description |
|---|---|
| + | Addition |
| - | Subtraction |
| * | Multiplication |
| / | Division |
| ^ | Power |
| > | Larger Than |
| < | Smaller Than |
| >= | Larger or Equal |
| <= | Smaller or Equal |
| = | Equal |
| <> | Not equal |
| and | Conjunction |
| or | Disjunction |
Remember that the logical operators (last 4 lines) return data which is either 1 (result is true) or 0 (result is false).
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When Application is set to f(F) the available options are as follows:
| Function | Description |
|---|---|
| -- | negative of the input |
| not | negation of input : returns 0 where input values are non-zero, 1 otherwise |
| sgn | sign of the input : -1 where input is negative, 1 where positive, 0 where null |
| int | integer part of the input |
| abs | absolute part of the input |
| sqrt | square root of the input |
| log | natural logarithm of the input |
| log10 | logarithm base 10 of the input |
| exp | exponential of the input |
| sin | sine of input (must be in radians) |
| cos | cosine of input (must be in radians) |
| tan | tangent of input (must be in radians) |
| asin | arc sine of input (must be in radians) |
| acos | arc cosine of input (must be in radians) |
| atan | arc tangent of input (must be in radians) |
| coslat | cosine of the latitude of the input grid points |
| sinlat | sine of the latitude of the input grid points |
| count | the number of fields within the input |
| mean | mean field of the input. Apply to GRIB input only |
| rms | root mean square field of the input. Apply to GRIB input only |
| stdev | standard deviation field of the input. Apply to GRIB input only |
| sum | sum field of the input |
| var | variance field of the input. Apply to GRIB input only |
Note that some options apply only to GRIB icon input.
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When Application is set to f(F,G) the available options are as follows:
| Function | Description |
|---|---|
| max | returns the maximum of the two input elements: a GRIB/Geopoints of the maximum of the input GRIB/Geopoints at each grid point or location. Output GRIB data contain the same number of fields as the maximum is taken on a field by field basis |
| min | as above but returning the minimum |
| covar | returns a GRIB field equal to the covariance of the input fieldsets. Apply only to GRIB input |
| div | returns the integer result of division of F by G |
| merge | returns a single GRIB fieldset composed of all the fields in the input GRIB fieldsets. Apply only to GRIB input |
| mod | returns the result of F modulo G |
| interpolate | returns a set of Geopoints at the locations of the Geopoints specified by G, with values calculated by interpolation at those points from the first field of fieldset F |
When Application is set to f(F,x) or f(x,F) the available options are as follows:
| max | returns the maximum of the two input elements: a GRIB/Geopoints of the maximum of the input GRIB/Geopoints at each grid point or location and the specified location. Output GRIB data contain the same number of fields as the maximum is taken on a field by field basis |
| min | as above but returning the minimum |