ArcMap

CreateRandomValueGenerator

描述

创建新的随机数生成器。

语法

CreateRandomValueGenerator (seed, distribution)
参数说明数据类型
seed

初始化随机数生成器。

Integer
distribution

随机生成算法。

  • ACM599 —ACM collected algorithm 599
  • MERSENNE_TWISTER —Mersenne Twister mt19937
  • STANDARD_C —Standard C Rand

(默认值为 ACM599)

String

返回值

数据类型说明
Object

RandomNumberGenerator 对象。

代码示例

CreateRandomValueGenerator 示例

创建并初始化随机数生成器对象。

import arcpy
# CreateRandomValueGenerator takes 2 arguments, seed and distribution
# method. The distribution method options are ACM599,
# MERSENNE_TWISTER, and STANDARD_C.
#
# The gen variable is a randomNumberGenerator object that is assigned
# to the randomGenerator environments setting.
arcpy.env.randomGenerator = arcpy.CreateRandomValueGenerator(20, "STANDARD_C")
# Calculate a random number using the ArcGIS.Rand() function
result = arcpy.CalculateValue_management("arcgis.rand('normal 0.0 10.0')")
# Print the returned value from the Result object
print(float(result.getOutput(0)))

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