柱面坐标系是一种数据，设M(x,y,z)为空间内一点，并设点M在xoy面上的投影P的极坐标为r,θ，则这样的三个数r, θ,z就叫点M的柱面坐标。
建立了柱面坐标系下分层弹性半空间地基土模型。
The elastic layered half-space soil model is established in the cylindrical coordinates.
splot 命令默认使用的是笛卡儿坐标系，不过也可以支持球面或柱面坐标系。
The splot command is Cartesian by default but can also support spherical and cylindrical coordinates.
使用多元复合函数微商法则，导出拉普拉斯算符在柱面坐标系和球面坐标系中表达式。
The Laplacian in the columnar and spherical coordinates is deduced by using the derivative principle of the multivariable functions.
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