!= (Relational Not Equal) operator

Summary

Returns 1 for cells where the first raster is not equal to the second raster and 0 for cells where it is equal.

Discussion

Returns 1 for cells where the first raster does not equal the second raster and 0 for cells where it does.

When using an operator with a raster input the result will be a raster. However, if all inputs are numbers, then the result is a number.

When multiple operators are used in an expression, they are not necessarily executed in left-to-right order. The operator with the highest precedence value will be executed first. For more information on operator precedence, see operator precedence table. You can use parentheses to control the execution order.

Boolean (~, &, ^, |) operators have a higher precedence level than Relational (<, <=, >, >=, ==, !=) operators. Therefore, when Boolean operators are used in the same expression as Relational operators, the Boolean operators will be executed first. To change the order of execution, use parentheses.

When multiple Relational and/or Boolean operators are used consecutively in a single expression, in some cases it may fail to execute. To avoid this potential problem, use appropriate parentheses in the expression so that the execution order of the operators is explicitly defined. For more information, see Complex Statement Rules.

Two inputs are necessary for the evaluation to take place.

The order of input is irrelevant for this operator.

If both inputs are single band rasters, or one of the inputs is a constant, the output will be a single band raster.

If both inputs are multiband rasters, or one of the inputs is a constant, the output will be a multiband raster. The number of bands in each multiband input must be the same.

The operator will perform the operation on each band from one input against the corresponding band from the other input. If one of the inputs is a multiband raster and the other input is a constant, the operator will perform the operation against the constant value for each band in the multiband input.

Syntax

in_raster_or_constant1 != in_raster_or_constant2
 Operand Explanation Data Type in_raster_or_constant1 The input that will be compared to for inequality by the second input. If one of the inputs is a raster and the other is a scalar, an output raster is created with the evaluation being performed for each cell in the input raster. Raster Layer | Constant in_raster_or_constant2 The input that will be compared from for inequality by the first input. If one of the inputs is a raster and the other is a scalar, an output raster is created with the evaluation being performed for each cell in the input raster. Raster Layer | Constant

Return Value

 Name Explanation Data Type out_raster The output raster object.Where cell values in the first input and second inputs are not equal, the output cell value will be 1. If the values are equal, the output value will be 0. Raster

Code sample

!= (Not Equal) example 1 (Python window)

This sample performs a Not Equal operation on two input rasters.

# Name: Op_NotEqual_Ex_02.py
# Description: Performs a relational not-equal operation on two
#              inputs on a cell-by-cell basis
# Requirements: Image Analyst Extension

# Import system modules
import arcpy
from arcpy import env
from arcpy.ia import *

# Set environment settings
env.workspace = "C:/iapyexamples/data"

# Set local variables
inRaster1 = Raster("degs")
inRaster2 = Raster("negs")

# Execute NotEqual
outNotEqual = inRaster1 != inRaster2

# Save the output
outNotEqual.save("C:/iapyexamples/output/outnotequal")
!= (Not Equal) example 2 (stand-alone script)

This sample performs a Not Equal operation on two input rasters.

# Name: Op_NotEqual_Ex_02.py
# Description: Performs a relational not-equal operation on two
#              inputs on a cell-by-cell basis
# Requirements: Image Analyst Extension

# Import system modules
import arcpy
from arcpy import env
from arcpy.ia import *

# Set environment settings
env.workspace = "C:/iapyexamples/data"

# Set local variables
inRaster1 = Raster("degs")
inRaster2 = Raster("negs")

# Execute NotEqual
outNotEqual = inRaster1 != inRaster2

# Save the output
outNotEqual.save("C:/iapyexamples/output/outnotequal")