# / (Division) operator

Spatial Analyst のライセンスで利用可能。

Image Analyst ライセンスで利用できます。

## サマリー

Divides the values of two rasters on a cell-by-cell basis.

## 説明

ラスター入力で演算子を使用すると、結果はラスターになります。 ただし、すべての入力値が数字の場合、結果は数字になります。

この演算子では、入力の順序が結果に影響します。

When a number is divided by zero, the output result is NoData.

The exact division technique used by this operator depends on the application being used when performing it.

In ArcGIS Pro, the floating-point division of Python 3 is always used for this operator, and the output will always be a floating-point value. For example, if 3 is divided by 2, the output is 1.5.

In ArcMap, the divide operator employs the integer division technique of Python 2, where only the integer quotient is retained. If both inputs are integers, the operator performs an integer division, and the output will be an integer. For example, if 3 is divided by 2, the output is 1, or if -3 is divided by 2, the output is -2. If either input is of floating-point type, the divide operator performs a floating-point division, and the output will be a floating-point value. For example, if 3 is divided by 2.0, the output is 1.5.

##### 注意:

Keep this difference in mind if you are migrating from ArcGIS Desktop to ArcGIS Pro, or you will be working in a mixed environment of both. You can use the // (Integer Division) operator if it is important to maintain the integer output.

Another way to perform the divide operation is a /= b, which is an alternative way to write a = a / b.

## パラメーター

 オペランド 説明 データ タイプ in_raster_or_constant1 The input whose values will be divided by the second input.If the first input is a raster and the second is a scalar, an output raster is created with each input raster value being divided by the scalar value. Raster Layer | Constant in_raster_or_constant2 The input whose values the first input are to be divided by.If the first input is a scalar and the second is a raster, an output raster is created, with each input raster value being divided into the scalar value. Raster Layer | Constant

## コードのサンプル

/ (Division) example 1 (Python window)

This sample divides the values of the first input raster by the second.

``````import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outDivide = Raster("degs") / Raster("negs")
outDivide.save("C:/sapyexamples/output/outdivide")``````
/ (Division) example 2 (stand-alone script)

This sample divides the values of the first input raster by the second.

``````# Name: Op_Divide_Ex_02.py
# Description: Divides the values of two rasters on a cell-by-cell basis
# Requirements: Spatial Analyst Extension

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

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

# Set local variables
inRaster01 = Raster("elevation")
inRaster02 = Raster("landuse")

# Execute Divide
outDivide = inRaster01 / inRaster02

# Save the output
outDivide.save("C:/sapyexamples/output/outdivide2")``````