Some simple functions for subsetting images
image2lz {fields} Some simple functions for subsetting images Package: fields Version: 6.9.1 Description These function help in subsetting images or reducing its size by averaging…
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“Spatial Statistics” does not mean applying traditional (non-spatial) statistical methods to data that just happens to be spatial (has X and Y coordinates). Spatial statistics…
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Description A comprehensive toolset for ML and GM estimation and diagnostic testing of econometric models for spatial panel data. Details Package: splm Type: Package Version:…
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Confirmatory vs Exploratory Data Analysis Confirmatory Analysis Inferential Statistics – Deductive Approach Heavy reliance on probability models Must accept untestable assumptions Look for definite answers…
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一、上网步法 (1)蹬跨步上网步法: 起动后左脚后蹬,接着侧身,右脚向球的方向跨出一大步击球。 (2)两步蹬跨步上网步法: 起动后,左脚先朝球的方向迈一步,紧接着左脚后蹬,侧身将右脚朝球的方向跨出一大步。 (3)垫步加蹬跨步上网步法: 右脚先向来球方向迈出一步,紧接着左脚垫一小步,同时右脚抬起,利用左脚的蹬力蹬跨出一大步,到位击球。 (4 )前交叉步加蹬跨步上网步法: 起动后,右脚先向球的方向垫一步,左脚再迈一步,紧接着左脚后蹬,侧身将右脚向球的方向跨一大步,到位击球。 (5)后交叉步加蹬跨步上网步法: 起动后,右脚先向球的方向垫一步,接着,左脚向右脚后交叉一步,左脚一着地马上用力后蹬,侧身将右脚向球的方向跨一大步,到位击球。 (6)蹬跳步上网步法: 这是一种特殊的上网步法,当对方回击网前球过高时,为争取速度,上网扑球常常使用这种步法。这种步法,省略了上网步法中的移动过程。从起动开始,身体前倾,双脚向网前方向起跳。击球后,腾空的身体下降,双脚几乎同时落地(右脚稍先落地),然后两脚调整身体重心,恢复正常姿势。要注意防止因前冲力过大而触网或过中线犯规。 (7)上网步法应注意事项: 完成击球动作时的姿势,是上网步法中较复杂的一环,因为者一环要承担人体前冲的缓冲力量,同时又要顾及手部的击球质量和击球后的迅速回动。所有的上网步法均应注意做到下列要求: 1、什么位置做最后蹬跨为好,要看球的位置而定,一般应以最后一步跨出后,侧身对网,自然伸直手臂让拍子能打到球为宜。太远打不到球,太近也会妨碍击球动作,且延长了回动距离。 2、最后的蹬跨步都应该右脚在前,步幅较大,着地点超越膝关节,重心在右脚上,脚尖外展。右脚应以脚跟外侧沿先着地,然后过渡到脚掌,并用脚趾制动,不使身体再前冲。右臂前伸击球时,左臂自然张开。击球后,立即右脚回蹬,如果最后跨步步幅很大,左脚应该自然跟随前移一些,以便回动。 3、放网前球、挑球一般采取低重心姿势。搓球、推球、勾球时身体较直,重心较高。扑球时往往需要向上方蹬跳。 4、上网最后一步步幅要跨大,必须注意两点:1)左脚用力向前蹬的同时,应向前送髋,以增大跨步的距离。2)向前跨出的右腿,在送髋和左脚发出蹬力的同时,应向上抬右腿。右腿抬得高,向前落地的距离才会远。 5、右脚落地是缓冲和回动的关键。要做到制动快而且自然,也必须注意两点:1)右脚向前的姿势,应该是小腿前伸(不是伸直),腿腕屈,脚跟向下,脚尖向上。2)以脚跟稍偏外侧部先着地,迅速向前脚掌滑去;脚尖制动,并做回蹬。 6、完成跨步和制动后(右膝弯曲不能超过脚尖),回动时必须注意:身体重心适当放在右脚上,左腿向右腿稍微跟进以分担右脚承受的重量,协助右脚从弓箭步姿势恢复直立。再以并步或交叉步退回中心位置。 二、后退步法 (1)正手后退步法: …
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