In this article, the evaluation of its absolute errors by interpolation of functions in
the Haar and Dobeshi wavelet methods was performed. The results of both methods were compared
.At the same time, the determination of coefficients was carried out using Haar's method of rapid
transformation. It is known that there would be small errors in the calculation of Haar's wavelet
coefficients as a result of the use of approximate computational operations on a large number of
integrals. In addition, these calculations can perform a number of mathematical operations and take up
extra space in computer memory. In this work, Haar's rapid conversion algorithm has been used to
reduce computational operations and increase interpolation accuracy.