And then I’m going to run a test command here to make sure everything is up and running. As you can see this is the version of R I’m running and the connection succeeded. Note that the free version of Mathematica, the evaluation version, doesn’t come with support for R, so if ...
By the time I was a midteenager in the mid-1970s, I made an important little personal discovery: I didn’t actually need to do all those calculations myself—I could just get a computer to do them for me. I invented all sorts of tricks for working out complicated algebraic things with...
ecmCommands <-'create with the model susceptible exposed infected two hospitalized recovered;assign 100000 to the susceptible population;set infected normally symptomatic population to be 0;set infected severely symptomatic population to be 1;assign 0.56 to contact rate of infected normally symptomatic pop...
And key to everything we do is leveraging what we have already done—often taking what in earlier years was a pinnacle of technical achievement, and now using it as a routine building block to reach a level that could barely even be imagined before. And beyond practical techn...
This function can be used in two ways, taking the following arguments: 1. PPN[h][i], where h is a tensor head and i is a sequence of indices, such that each index either belongs to S3 or is LI[0] (possible with a minus sign); 2. PPN[h,n][i], where n is a non-negative...
Oh dear, something has gone drastically wrong! The parallel calculation is taking 7 seconds (or 50%) longer than the serial calculation. Before writing a bug report to Wolfram, I thought I would dig around a little to try and work out what was going on. ...
FindShortestTourhas a direct way to return individual features of the result, rather than always packaging them together in a list. PersistentSymbolandLocalSymbolnow allow reassignment of parts using functions likeAppendTo. SystemModelMeasurementsnow gives diagnostics such as rise time and...
If we add a symbol for the complex exponential to the language, however, strong minimality does not hold anymore: the kernel ofis a countable definable subset of. In fact, the ring of integers is definable as the multiplicative stabilizer of the kernel, and this leads to the failure of good...
A great long-term strength of the Wolfram Language has been its ability to produce insightful visualizations in a highly automated way. In Version 13.3 we’re taking this further, by adding automatic “live highlighting”. Here’s a simple example, just using the functionPlot. Ins...
The original (classical) version of Richardson extrapolation consists in taking a linear combination of numerical solutions obtained by two different time-steps with time-step sizes h and h/2 by the same numerical method. Multiple Richardson extrapolation is a generalization of this procedure, where ...