xirr函数确定一序列发生在间隔不规则日期里现金流的IRR。
The XIRR function determines the irr of a sequence of cash flows that occur on any set of irregularly spaced dates.
为模拟不规则波，采用了线性波浪叠加法。利用相关函数法进行谱估计，以检验不规则波造波效果。
Then the linear superposition method is used to simulate irregular wave, and is verified by the autocorrelation method of wave spectrum estimation.
借鉴自然邻点插值法，提出了基于高度不规则网格多边形单元的有理函数插值格式—多边形有理函数插值。
This paper presents a rational function interpolation scheme of polygonal elements based on highly irregular grids. It is named as polygonal rational function interpolation (RFI).
目前迭代函数系统中的变换多限于仿射变换，而仿射迭代函数系统对于区域的任意四边形不规则剖分情形是不能实现的。
At present, the transform in IFS is limit to affine transform. However, affine IFS is unable to do anything with the anomalous dissection on discretionary quadrangle area.
基于RNG紊流模型，采用VOF法、空度法和璧面函数法分别处理自由面、不规则边界和壁边界，对丁坝附近的水流进行了模拟和研究。
RNG turbulent model combining with VOF method, porosity method and wall function was used to simulate and research the flow around a spur-dike.
基于RNG紊流模型，采用VOF法、空度法和璧面函数法分别处理自由面、不规则边界和壁边界，对丁坝附近的水流进行了模拟和研究。
RNG turbulent model combining with VOF method, porosity method and wall function was used to simulate and research the flow around a spur-dike.
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