Revised Library of Functions is an update to the library originally published by Arthur Glazar [1]. The original starter library of functions was published simultaneoulsy Steve Taranovich [2]. The original library contains basic operators for use in LTspice electronic simulation software [3]. LTspice is a high performance SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits [3]. The library of operators includes integration, differentiation, summation, inversion, multiplication, and division. The original version of these operators was for LTspiceIV, and these original files still work in LTspiceXVII. However, the original 3Summer file contained an error which needs to be fixed before the operator can be used. That file has been corrected here. That and the other files have also been updated and simplifed for easier use in the Windows 10 operating system. Analog computing is receiving increased attention in recent years because of extremely high processing speeds at very low energy cost [4]. In addition to being fun to use, analog computers are excellent teaching tools for solving differential equations. As explained by Arthur Glazar, analog computers became extinct in the 1970s for good reasons, but the reasons for the demise are eliminated in a virtual implementation [1]. In applications such as automatic process control, analog representations allow clear visualization of the flow of information through the control network. Analog signal processing is still common in other apllications such as instrumentation for chemical analysis. The files provided here allow the user to explore and learn the basics of analog computing in the LTspice environment.