euler_numbereuler_numberEulerNumberEulerNumbereuler_number (算子名称)

名称

euler_numbereuler_numberEulerNumberEulerNumbereuler_number — Calculate the Euler number.

参数签名

描述

该算子 euler_numbereuler_numberEulerNumberEulerNumberEulerNumbereuler_number calculates the Euler number, i.e., the difference between the number of connection components and the number of holes.

In the documentation of this chapter (Regions / Features), you can find an image illustrating regions which vary in their Euler number.

If more than one region is passed the results are stored in tuples, the index of a value in the tuple corresponding to the index of a region in the input.

运行信息

• 多线程类型:可重入(与非独占操作符并行运行)。
• 多线程作用域:全局(可以从任何线程调用)。
• 在元组级别自动并行化。

参数表

结果

该算子 euler_numbereuler_numberEulerNumberEulerNumberEulerNumbereuler_number 返回值 2 ( H_MSG_TRUE) if the input is not empty. The behavior in case of empty input (no input regions available) is set via 该算子 set_system('no_object_result',<Result>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)set_system("no_object_result",<Result>). The behavior in case of empty region (the region is the empty set) is set via set_system('empty_region_result',<Result>)set_system("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)set_system("empty_region_result",<Result>). If necessary an exception is raised.

可能的前置算子

thresholdthresholdThresholdThresholdThresholdthreshold, regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing, connectionconnectionConnectionConnectionConnectionconnection

可替代算子

connect_and_holesconnect_and_holesConnectAndHolesConnectAndHolesConnectAndHolesconnect_and_holes

模块

Foundation