Another way to approach the linear combination is to look at it geometrically. This is where the idea of barycentric coordinates can help. A barycentric coordinate system describes the location of a point as the weighted sum of the regular coordinates of the vertices forming a simplex. In other words, it describes a linear combination with respect to a set of points, where in -dimensional space.
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表妹挨打的理由，往往只是些无关紧要的小事。比如，外公煮面时，把火腿肠连带外包装扔进锅里煮，她不想吃，挨打；抽背九九乘法表，被问到老师没教过的部分，背不出，挨打。继承了外公脾气的舅舅，每次回家，教育孩子的方式也如出一辙。
“The notion that this was a playful snowball fight obviously is not true,” Patrick Hendry, a police union president, told reporters after the proceeding. “This was an attack on the uniform that these police officers wear so proudly every day. They came after these police officers, pelting them with ice, rocks.”