MDVRP遗传算法源码在MATLAB平台的应用

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资源摘要信息: "本资源是一个针对多车辆配送问题(Multiple Depot Vehicle Routing Problem, MDVRP)的测试可用的Matlab实现。源码使用遗传算法进行优化求解,文件名为MDVRP1_测试可用_MDVRP_cast2ka_遗传算法_matlabMDVRP_源码.rar。该资源适合对优化算法和车辆路径规划感兴趣的IT专业人士进行研究和学习。" 知识点一:多车辆配送问题(MDVRP) 多车辆配送问题是一种复杂的组合优化问题,属于车辆路径问题(Vehicle Routing Problem, VRP)的扩展。MDVRP的核心是为多个配送中心的多个车辆规划路径,使得配送成本最低化,同时满足一系列约束条件,例如车辆容量、时间窗口限制、配送中心数量等。它在物流、供应链管理和城市配送等领域有着广泛的应用。 知识点二:遗传算法 遗传算法是启发式搜索算法,灵感来源于自然选择和遗传学的机制。它通常用于解决优化和搜索问题。遗传算法通过模拟自然界的进化过程,利用选择(Selection)、交叉(Crossover)和变异(Mutation)三个基本操作对候选解进行迭代进化,最终获得问题的最优解或满意解。在MDVRP中,遗传算法被用来寻找成本最低的配送方案。 知识点三:Matlab实现 Matlab(Matrix Laboratory的简称)是美国MathWorks公司出品的一套高性能的数值计算和可视化软件。它在工程计算、数据分析、算法开发等领域有着广泛的应用。在本资源中,Matlab被用作开发环境,用于编写和测试MDVRP的遗传算法解决方案。Matlab的矩阵处理能力、强大的内置函数库以及可视化功能,使得编程更加简便和直观。 知识点四:源码分析 本资源的文件名“MDVRP1_测试可用_MDVRP_cast2ka_遗传算法_matlabMDVRP_源码.rar”提示了源码的用途和功能。源码包含了MDVRP问题的定义、遗传算法的具体实现步骤、算法参数配置以及结果的输出方式。通过研究源码,IT专业人士可以深入理解遗传算法在MDVRP问题中的应用,以及如何通过Matlab来实现这一复杂的算法。 知识点五:测试可用性 测试可用性表明该资源已经经过了初步的测试,可以正常运行。在开发和优化算法时,测试是非常重要的一步。它不仅可以帮助开发者验证算法的正确性,还可以评估算法在实际问题中的表现。测试可用的资源能够让用户节省大量的时间,因为他们不必从零开始编写和调试代码,而是可以在这个基础上直接进行研究、分析或者进一步的开发工作。 通过上述分析,我们可以看出,该资源提供了一个非常有价值的工具包,它结合了MDVRP问题的复杂性、遗传算法的优化能力以及Matlab编程的便捷性。IT专业人士可以利用这个工具包来研究MDVRP问题,尝试改进遗传算法,或者将其应用于实际的物流和供应链优化项目中。此外,对于希望学习和掌握遗传算法及其在VRP中应用的研究者,该资源也是一个很好的学习材料。

优化这个sql SELECT count( 1 ) FROM ( SELECT B.ID, B.PURCHASE_REQUEST_ID, B.MATERIAL_ID, B.MATERIAL_CODE, B.MATERIAL_NAME, B.STANDARD, B.MODEL_ID, B.BILL_ROW_ID, B.BILL_NO, BILL_NAME, B.MODEL_CODE, B.MODEL_NAME, B.PARENT_MODEL_ID, B.PARENT_MODEL_CODE, B.PARENT_MODEL_NAME, B.UNIT_CODE, B.UNIT_NAME, B.PURCHASE_TYPE_CODE, CAST( NVL( B.APPLY_NUM, 0 ) AS NUMBER ( 24, 10 ) ) AS APPLY_NUM, CAST( NVL( B.DEAL_NUM, 0 ) AS NUMBER ( 24, 10 ) ) AS DEAL_NUM, CAST( NVL( B.RETURN_NUM, 0 ) AS NUMBER ( 24, 10 ) ) AS RETURN_NUM, B.DEAL_USER_ID, B.DEAL_USER_NAME, CAST( NVL( B.PRICE, 0 ) AS NUMBER ( 24, 10 ) ) AS PRICE, CAST( NVL( B.AMOUNT, 0 ) AS NUMBER ( 24, 10 ) ) AMOUNT, B.IMPLEMENT_CODE, B.IMPLEMENT_NAME, B.IMPLEMENT_INVEST_AMOUNT, B.PURCHASE_MANAGER_ID, B.PURCHASE_MANAGER_NAME, B.PROVIDER_ID, B.PROVIDER_NAME, B.REMARK, B.DELIVER_AREA, B.DELIVER_ADDRESS, B.RECEIVE_PEOPLE, B.RECEIVE_PEOPLE_PHONE, B.ITEM_STATUS, B.COST_CENTER, B.COST_BUDGET_CODE, B.COST_IMPLEMENT_NAME, B.FRAME_CONT_ID, B.FRAME_CONT_CODE, B.FRAME_CONT_NAME, B.DETAIL_CONFIG, B.PURCHASE_CATEGORY_CODE, B.INVOICE_TITLE_CODE, B.INVOICE_SEND_ADDRRSS, B.MATERIAL_REQUEST_ITEM_ID, B.YEAR, B.DELETE_FLAG, B.PROVINCE_CODE, B.REASON, B.PARENT_ITEM_ID, B.FRAME_CONT_ITEM_ID, B.SUB_MATERIAL_REQUEST_ID, B.SUB_MATERIAL_REQUEST_CODE, B.MATERIAL_URL, B.RECOMMEND_PROVIDER_NAMES, C.PURCHASE_REQUEST_CODE, C.PURCHASE_REQUEST_NAME, C.APPLY_TYPE_CODE, C.CREATOR_NAME, C.APPLY_TELEPHONE, C.COMPANY_NAME, C.DEPT_NAME, B.CREATE_TIME, TO_CHAR( B.CREATE_TIME, 'YYYY-MM-DD' ) CREATE_TIME_STR, C.ARRIVE_TIME, C.IS_TO_END, C.MONEY_WAY_CODE, C.OWN, C.APPLY_CATEGORY_CODE, C.manu_Type, C.BILL_ID, MMD.MATERIAL_TYPE_CODE, B.BRANCH_COMPANY_DEAL_USER_ID, B.BRANCH_COMPANY_DEAL_USER_NAME, ( SELECT ORG_NAME FROM ORGANIZATIONS WHERE DELETE_FLAG = '0' AND ORG_CODE = ( SELECT PARENT_COMPANY_NO FROM ORGANIZATIONS WHERE ID = B.MATERIAL_DEPT_ID )) AS MATERIAL_COMPANY_NAME, B.ORIGINAL, B.PROVIDER_PRODUCT_MODEL, B.PROVIDER_PRODUCT_NAME, B.PRODUCT_DESC, B.Back_Flag, CASE WHEN MMD.material_type_code = 'WZ' THEN '1' WHEN MMD.material_type_code = 'FW' THEN '2' ELSE '3' END apply_category_code_item, NVL( C.IS_CARDSYSTEM_REQUEST, '0' ) IS_CARDSYSTEM_REQUEST, B.APPLY_GROUP_AUTHORITES, B.SCIENTIFIC_RESEARCH_ID, B.SCIENTIFIC_RESEARCH_CODE, B.SCIENTIFIC_RESEARCH_NAME, B.PREQUALFY_CODE, nvl( C.IS_QUICK, '0' ) AS IS_QUICK, C.PURCHASE_WAY_CODE, C.PURCHASE_TYPE_CODE PURCHASE_TYPE_CODE_P, C.ORIGINAL_TYPE, C.PURCHASE_REQUEST_BILLS_TYPE, B.IS_FRAME_CONT_MONAD FROM PURCHASE_REQUEST_ITEM B LEFT JOIN PURCHASE_REQUEST C ON B.PURCHASE_REQUEST_ID = C.ID LEFT JOIN MATERIAL_DATA MMD ON MMD.ID = B.MATERIAL_ID AND MMD.DELETE_FLAG = '0' WHERE B.delete_flag = '0' AND B.Item_Status IN ( 1 ) AND NOT EXISTS ( SELECT * FROM purchase_request_item_log pril WHERE B.id = pril.purchase_request_item_id AND pril.lock_status = '1' AND pril.delete_flag = '0' ) AND ( ( c.apply_type_code NOT IN ( '20', '41', '3' ) AND nvl( B.Apply_Num, 0 ) > nvl( B.Deal_Num, 0 )) OR c.apply_type_code IN ( '20', '41', '3' ) ) AND B.Deal_User_Id =: 1 AND C.MONEY_WAY_CODE =: 2 AND C.APPLY_TYPE_CODE =: 3 AND C.PAY_OUT_TYPE_CODE =: 4 AND C.APPLY_CATEGORY_CODE =: 5 AND NVL( C.IS_CARDSYSTEM_REQUEST, '0' ) = : 6 AND NOT EXISTS ( SELECT * FROM purchase_request_item p left join material_province mp ON p.material_id = mp.material_id WHERE p.delete_flag = 0 AND mp.delete_flag = 0 AND mp.material_status = 03 AND mp.org_code = p.province_code AND p.id = B.id ) ORDER BY C.ID, B.ID ASC)

2023-06-08 上传

请详细解释下这段代码Rect<float> Framer::ComputeActiveCropRegion(int frame_number) { const float min_crop_size = 1.0f / options_.max_zoom_ratio; const float new_x_crop_size = std::clamp(region_of_interest_.width * options_.target_crop_to_roi_ratio, min_crop_size, 1.0f); const float new_y_crop_size = std::clamp(region_of_interest_.height * options_.target_crop_to_roi_ratio, min_crop_size, 1.0f); // We expand the raw crop region to match the desired output aspect ratio. const float target_aspect_ratio = static_cast<float>(options_.input_size.height) / static_cast<float>(options_.input_size.width) * static_cast<float>(options_.target_aspect_ratio_x) / static_cast<float>(options_.target_aspect_ratio_y); Rect<float> new_crop; if (new_x_crop_size <= new_y_crop_size * target_aspect_ratio) { new_crop.width = std::min(new_y_crop_size * target_aspect_ratio, 1.0f); new_crop.height = new_crop.width / target_aspect_ratio; } else { new_crop.height = std::min(new_x_crop_size / target_aspect_ratio, 1.0f); new_crop.width = new_crop.height * target_aspect_ratio; } const float roi_x_mid = region_of_interest_.left + (region_of_interest_.width / 2); const float roi_y_mid = region_of_interest_.top + (region_of_interest_.height / 2); new_crop.left = std::clamp(roi_x_mid - (new_crop.width / 2), 0.0f, 1.0f - new_crop.width); new_crop.top = std::clamp(roi_y_mid - (new_crop.height / 2), 0.0f, 1.0f - new_crop.height); const float normalized_crop_strength = std::powf(options_.crop_filter_strength, ElapsedTimeMs(timestamp_) / kUnitTimeSlice); active_crop_region_.left = IirFilter(active_crop_region_.left, new_crop.left, normalized_crop_strength); active_crop_region_.top = IirFilter(active_crop_region_.top, new_crop.top, normalized_crop_strength); active_crop_region_.width = IirFilter( active_crop_region_.width, new_crop.width, normalized_crop_strength); active_crop_region_.height = IirFilter( active_crop_region_.height, new_crop.height, normalized_crop_strength); timestamp_ = base::TimeTicks::Now(); if (VLOG_IS_ON(2)) { DVLOGFID(2, frame_number) << "region_of_interest=" << region_of_interest_; DVLOGFID(2, frame_number) << "new_crop_region=" << new_crop; DVLOGFID(2, frame_number) << "active_crop_region=" << active_crop_region_; } return active_crop_region_; }

2023-06-09 上传