![]() However, the level of difficulty is a little bit higher than the first method (especially if you are new to Excel). SUMPRODUCT formula With this method, you avoid the intermediate calculations, and by using only one function, you get the result. The picture above contains the entire set of calculations. In the sample workbook, for example, we had the function y 4x2, we knew 10 points, so we applied the formula 9 times.įor the first point the result was (1 0)(4 0)2 2, for the second (2 1)(16 4)2 10 and so on. It follows that: Calculate the area under a curvethe integral of a function 1st method: Spreadsheet calculations If n points (x, y) from the curve are known, you can apply the previous equation n-1 times and then sum the results. One popular method for accomplishing this task is the so-called trapezoidal rule.Īccording to Wikipedia: The trapezoidal rule is a technique for approximating the definite integral: The trapezoidal rule works by approximating the region under the graph of the function f(x) as a trapezoid and calculating its area. So, if you have to calculate the area under a curve, you must think of an indirect way to do it. Microsoft Excel Exponential Integral Function Approximation Free Search CHECK Microsoft Excel Exponential Integral Function Approximation Free Search CHECK.
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