arcpy.analysis.Frequency(in_table, out_table, frequency_fields, {summary_fields})
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名称
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说明
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数据类型
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in_table
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包含用于计算频率统计数据的字段的表。
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Table View; Raster Layer
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out_table
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输出表用于存储频数统计数据。
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Table
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frequency_fields
[frequency_fields,...]
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要用于计算频数统计数据的字段。 字段值的每种唯一组合都将作为新的一行包括在输出表中。
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Field
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summary_fields
[summary_fields,...]
（可选）
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将求和并添加至输出表的数值属性字段。 值将根据频数字段的各种唯一组合进行求和。 将从此计算中排除空值。
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Field
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代码示例
Frequency 示例 1（Python 窗口）
以下 Python 窗口脚本演示了如何在即时模式下使用 Frequency 函数。
import arcpy
arcpy.env.workspace = "C:/data/Portland.gdb/Taxlots"
arcpy.analysis.Frequency("taxlots",
"C:/output/output.gdb/tax_frequency",
["YEARBUILT", "COUNTY"],
["LANDVAL", "BLDGVAL", "TOTALVAL"])
以下独立脚本演示了如何使用 Frequency 函数。
# Description: Run Frequency on a table
# Import system modules
import arcpy
# Set environment settings
arcpy.env.workspace = "C:/data/Portland.gdb/Taxlots"
# Set local variables
inTable = "taxlots"
outTable = "C:/output/output.gdb/tax_frequency"
frequencyFields = ["YEARBUILT", "COUNTY"]
summaryFields = ["LANDVAL", "BLDGVAL", "TOTALVAL"]
# Run Frequency
arcpy.analysis.Frequency(inTable, outTable, frequencyFields, summaryFields)
以下独立脚本演示了如何使用多个地理处理脚本函数（包括 Frequency 函数）。
# Description: Break all multipart features into single part features,
# and generate a report of which features were separated.
# Import system modules
import arcpy
# Create variables for the input and output feature classes
inFeatureClass = "c:/data/gdb.gdb/vegetation"
outFeatureClass = "c:/data/gdb.gdb/vegetation_singlepart"
try:
# Create list of all fields in inFeatureClass
fieldNameList = [field.name for field in arcpy.ListFields(inFeatureClass)]
# Add a field to the input this will be used as a unique identifier
arcpy.management.AddField(inFeatureClass, "tmpUID", "double")
# Determine what the name of the Object ID is
OIDFieldName = arcpy.Describe(inFeatureClass).OIDFieldName
# Calculate the tmpUID to the OID
arcpy.management.CalculateField(inFeatureClass, "tmpUID",
"[" + OIDFieldName + "]")
# Run the tool to create a new fc with only singlepart features
arcpy.management.MultipartToSinglepart(inFeatureClass, outFeatureClass)
# Check if there is a different number of features in the output
# than there was in the input
inCount = int(arcpy.management.GetCount(inFeatureClass)[0])
outCount = int(arcpy.management.GetCount(outFeatureClass)[0])
if inCount != outCount:
# If there is a difference, print out the FID of the input
# features which were multipart
arcpy.analysis.Frequency(outFeatureClass,
outFeatureClass + "_freq", "tmpUID")
# Use a search cursor to go through the table, and print the tmpUID
print("Multipart features from {0}".format(inFeatureClass))
for row in arcpy.da.SearchCursor(outFeatureClass + "_freq",
["tmpUID"], "FREQUENCY > 1"):
print(int(row[0]))
else:
print("No multipart features were found")
except arcpy.ExecuteError:
print(arcpy.GetMessages())
except Exception as err:
print(err)