Linked Questions

I'm teaching myself Mathematica and came across tagset. So I followed the example in the link, but seem to be missing the point. All of the below give me the same answer after assignment: that ...

I consider myself a pretty good Mathematica programmer, but I'm always looking out for ways to either improve my way of doing things in Mathematica, or to see if there's something nifty that I haven't ...

I really miss having something like a struct in Mathematica. I know of (and regularly use) a couple of programming techniques which feel like a ...

When reading through the documentation, you often encounter the phrases DownValues, UpValues, ...

Background Currently I am working with some large data (most of it generated by Mathematica itself). I usually find it a hassle to do this. For example, I just exported a large amount of data to ...

How was Nothing implemented in Wolfram language at the language level? For example, {a, b, Nothing, c, d, Nothing} will return <...

Some of the big mysteries of Universe Mathematica for me is the application of UpValues. I know about this question and know the very poor Mathematica documentation on that. I'm very curious to know ...

I was recently introduced to the LetL macro thanks to Leonid's answer to one of my prior questions. I was, needless to say, impressed by the simplicity of its ...

Background Suppose I have begun a fresh kernel session, and I have defined the following function alone: F[x_, y_] := x + y; One expected use of ...

I'm trying to develop an domain-specific language with Mathematica. I want to define a customized behavior for the Plus function when applied to my data. For ...

I have a function which depends on w,x,y,z. Let me call ...

I am redefining some of the standard math functions. I know this is dangerous, so I am trying to be extra careful. (For instance, in the redefinitions, I make sure to only match a custom head) The ...

As this post has discussed, UpValues are certainly useful, and as this post has discussed, g /: f[g[x_]] := h[x] is not ...

I was reading What is the distinction between DownValues, UpValues, SubValues, and OwnValues? and I started to be confused with the part "Upvalues" of the first answer. Some of my confusion comes ...

This came up in an assignment problem. I am tasked to use 1) ▽ /: ▽[f_] := {D[f, x], D[f, y], D[f, z]} 2) ...

Suppose I have some symbolic tensors $X,Y$ and I want to assign X.Y into something else without specifying what $Y$ is. For example, I may want $Y$ to serve as ...