shift,shift0¶

shift, shift0

Shifts the value of each cell a specified number of cells in the assigned direction.

Result = shift(expression, northing, westing)

Result = shift0(expression, northing, westing)

expression
boolean, nominal, ordinal, scalar, directional, ldd, spatial
northing
scalar, non-spatial
westing
scalar, non-spatial
Result
datatype of expression, spatial

Operation¶

Each cell of expression is shifted a number of cells equal to the value of northing to the north (up) if northing is positive, or to the south (down) if northing is negative and each cell of expression is shifted a number of cells equal to the value of westing to the west (left) if westing is positive, or to the east (right) if westing is negative. The values of northing and southing are rounded down to the nearest integer. The shift and shift0 operation will result in a number equal to the value of northing of rows being lost on the north side of the map and created on the south side of the map. Similarly a number of columns equal to the value of westing will be lost on the west side of the map and created on the east side of the map. The newly created rows or columns will have missing values when using shift and will be assigned 0 when using shift0.

Notes¶

When using shift0 missing values that already exist in expression will also be assigned 0.

Examples¶

1. • pcrcalc
binding
Result = Result.map;
Expr = Expr.map;
initial
report Result = shift(Expr, 1,1);

• python
Result = shift(Expr, 1,1)
 Result.map Expr.map

2. • pcrcalc
binding
Result2 = Result2.map;
Expr = Expr.map;
initial
report Result2 = shift(Expr, -1,-1);

• python
Result2 = shift(Expr, -1,-1)
 Result2.map Expr.map

3. • pcrcalc
binding
Result1 = Result1.map;
Expr = Expr.map;
initial
report Result1 = shift0(Expr, -1,-1);

• python