length_xldlength_xldLengthXldLengthXldlength_xld (算子名称)

名称

length_xldlength_xldLengthXldLengthXldlength_xld — Length of contours or polygons.

参数签名

描述

length_xldlength_xldLengthXldLengthXldLengthXldlength_xld calculates the length of the contours or polygons XLDXLDXLDXLDXLDxld. The length is calculated as the sum of the Euclidean distances of successive points on the contour or polygon. If more than one contour or polygon is passed, the results are stored in tuples in the same order as the respective contours or polygons in XLDXLDXLDXLDXLDxld.

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

Complexity

Let n be the number of points of the contour or polygon. Then the run time is O(n).

结果

length_xldlength_xldLengthXldLengthXldLengthXldlength_xld returns 2 ( H_MSG_TRUE) if the input is not empty. If the input is empty the behavior can be set via 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>). If necessary, an exception is raised.

可能的前置算子

gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldGenContoursSkeletonXldgen_contours_skeleton_xld, smooth_contours_xldsmooth_contours_xldSmoothContoursXldSmoothContoursXldSmoothContoursXldsmooth_contours_xld, gen_polygons_xldgen_polygons_xldGenPolygonsXldGenPolygonsXldGenPolygonsXldgen_polygons_xld

参考其它

area_center_xldarea_center_xldAreaCenterXldAreaCenterXldAreaCenterXldarea_center_xld, moments_any_xldmoments_any_xldMomentsAnyXldMomentsAnyXldMomentsAnyXldmoments_any_xld, moments_xldmoments_xldMomentsXldMomentsXldMomentsXldmoments_xld, contlengthcontlengthContlengthContlengthContlengthcontlength

模块

Foundation