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一、问题的提出混凝土配合比设计经过试配以后,需要将试验取得的资料进行一系列数学计算,诸如求均方差、相关系数,以检查试验数据的准确性,然后用最小二乘法得出直线相关公式,供选择配合比使用。这些计算数据量大,过程繁杂,容易出错。电子计算机的推广,为这些计算提供了快速、准确的计算手段。笔者利用袖珍计算机及 BASIC 语言,编制了一套计算程序,将混凝土试块的强度值(因变量)、灰水比值(自变量)输入计算机内,可求出的均方差、相关系数、灰水比直线相关公式中的斜率、截距等,从而标出相应的各点离直线的偏差平方和最小的强度修正值,并绘出直线相关图,列出供选
First, the problem proposed after the concrete mix design after trial match, the data obtained by the test needs to be a series of mathematical calculations, such as the average of the variance, correlation coefficient, to check the accuracy of the test data, and then use the least square method to obtain a straight line Relevant formulas for use in alternative mix ratios. These calculation data are large, complicated and error-prone. The promotion of electronic computers provides quick and accurate calculation methods for these calculations. The author uses a pocket calculator and BASIC language to compile a set of calculation procedures to input the strength value (dependent variable) and grey water ratio (independent variable) of a concrete test block into a computer. The mean square error, correlation coefficient, and grey water can be calculated. Comparing the slope, intercept, etc. in the straight line correlation formula, so as to mark out the corresponding minimum intensity correction value of the square sum of the deviation from the straight line, and draw a straight line correlation diagram, listing for selection