介绍一种P—Ⅲ型频率曲线拟合程序

Introduction of A Program of Fitting P—Ⅲ Model Frequency Curve

本程序根据现有程序进行优化设计。数据采用人机对话方式键盘输入,屏幕用表格形式排列,并能够对输入的数据进行校核、修改。经验频率采用规范中推荐的公式计算,统计参数用矩法公式计算。采用正态分布积分曲线的近似公式计算概率格纸的坐标,并在屏幕绘图。一根曲线用最小二乘法优选参数C_v,C_s,根据理论频率曲线与经验点据拟合情况,可进行多次目估适线。适线完毕后,选择最满意的1～4根曲线,将其K_P值、设计值和C_v、C_s值等,输出到磁盘中或用打印机直接打印。整个程序采用全中文提示。

This program is optimally programed based on present programs. The hydrologic data are input with keyboard and arranged in format on screen, and can be proofread and corrected. The experiential frequency is calculated with formula recommended in the standard, and statistical parameters are calculated with matrix formula method. Coordinates of a normal probability paper are calculated with a approximate formula of normal distribution integral curve and drawn on screen. The C_V and C_S of the first curve are optimized with least square method. The C_V and C_S can be adjusted to draw another curve for several times. according to condition whether the theoretical curve fits in. The experiential frequency piont or not. At last, values of K_P, C_V, C_S and design values of 1～4 optimal curves are output to a soft disk or printed out with a printer. All prompt in the program is Chinese.