Is there any deviation in the result of VBA self-designed function in excel?

The deviation of VBA self-designed function results in p>Excel may be related to many reasons. The following reasons may lead to the deviation:

1. Data type mismatch: In VBA programming, data of numerical type must match the mathematical function used. If the data types do not match, the results may be biased. For example, when using the SIN function, you can only use radians, not degrees.

2. rounding error: when floating-point numbers are used for calculation, rounding error may be caused. These rounding errors can be accumulated when the same piece of code is executed repeatedly, resulting in deviation of results.

3. numerical precision: the numerical precision of some mathematical functions may not be high enough, which leads to the deviation of the results. This may affect some complex functions, such as trigonometric function, exponential function and logarithmic function.

4. Data amount: If the amount of data processed is too large, it may lead to memory overflow or performance bottleneck, resulting in calculation deviation.

5. code logic: if there are errors or defects in the code logic of the self-designed function, it may also lead to deviation of the results. Therefore, the correctness of code logic should be ensured when writing self-made functions.

to sum up, the way to deal with the deviation of the result of self-compiled function is to ensure that the data type, rounding error and numerical precision are correct, and check the correctness of code logic. If the above methods can't eliminate the deviation, we should consider reconstructing the function to improve the performance and accuracy.