Mathematica equivalent of Ruby's inject

Posted by Ben Alpert on Stack Overflow See other posts from Stack Overflow or by Ben Alpert
Published on 2010-06-02T23:54:32Z Indexed on 2010/06/03 0:04 UTC
Read the original article Hit count: 320

Filed under:

functional-programming

|

mathematica

Is there a Mathematica function like inject in Ruby? For example, if I want the product of the elements in a list, in Ruby I can write:

list.inject(1) { |prod,el| prod * el }

I found I can just use Product in Mathematica:

Apply[Product, list]

However, this isn't general enough for me (like, if I don't just want the product or sum of the numbers). What's the closest equivalent to inject?

© Stack Overflow or respective owner

Related posts about functional-programming

Introducing functional programming constructs in non-functional programming languages

as seen on Programmers - Search for 'Programmers'
This question has been going through my mind quite a lot lately and since I haven't found a convincing answer to it I would like to know if other users of this site have thought about it as well. In the recent years, even though OOP is still the most popular programming paradigm, functional programming… >>> More
Functional programming constructs in non-functional programming languages

as seen on Programmers - Search for 'Programmers'
This question has been going through my mind quite a lot lately and since I haven't found a convincing answer to it I would like to know if other users of this site have thought about it as well. In the recent years, even though OOP is still the most popular programming paradigm, functional programming… >>> More
Does functional programming mandate new naming conventions?

as seen on Stack Overflow - Search for 'Stack Overflow'
I recently started studying functional programming using Haskell and came upon this article on the official Haskell wiki: How to read Haskell. The article claims that short variable names such as x, xs, and f are fitting for Haskell code, because of conciseness and abstraction. In essence, it claims… >>> More
pitfalls/disadvantages of functional programming

as seen on Stack Overflow - Search for 'Stack Overflow'
When would you NOT want to use functional programming? What is it not so good at? I am more looking for disadvantages of the paradigm as a whole, not things like "not widely used", or "no good debugger available". Those answers may be correct as of now, but they deal with FP being a new concept (an… >>> More
Should functional programming be taught before imperative programming?

as seen on Stack Overflow - Search for 'Stack Overflow'
It seems to me that functional programming is a great thing. It eliminates state and makes it much easier to automatically make code run in parallel. Many programmers who were first taught imperative programming styles find it very difficult to learn functional programming, because it is so different… >>> More

Related posts about mathematica

Debugging a working program on Mathematica 5 with Mathematica 7

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi everybody, I'm currently reading the Mathematica Guidebooks for Programming and I was trying to work out one of the very first program of the book. Basically, when I run the following program: Plot3D[{Re[Exp[1/(x + I y)]]}, {x, -0.02, 0.022}, {y, -0.04, 0.042}, PlotRange -> {-1, 8}, PlotPoints… >>> More
Mathematica 8 crashes Ubuntu 13.10

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I have Mathematica 8 installed on my Ubuntu laptop since 2011. I updated Ubuntu several times, and experienced no problems with Mathematica. It also worked smoothly after I updated Ubuntu to 13.10 (it worked for sure for a week after update). When I tried to start Mathematica today by executing… >>> More
What is in your Mathematica tool bag?

as seen on Stack Overflow - Search for 'Stack Overflow'
We all know that Mathematica is great, but it also often lacks critical functionality. What kind of external packages / tools / resources do you use with Mathematica? I'll edit (and invite anyone else to do so too) this main post to include resources which are focused on general applicability in… >>> More
Running Mathematica-5 remotely

as seen on Server Fault - Search for 'Server Fault'
I have Mathematica 5 - a powerful CAS. I have a cheap netbook (running Windows XP), wich not only is too slow to run mathmatica on, I doubt it has the harddrive space. I do however have remote access to a number of very powerful computers, (most of wich run variose Linuxes, but one of which is Windows… >>> More
How to extract a Date from an SQLDateTime object in Mathematica

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to do a plot of a time series with DateListPlot. I want to feed it a time series I obtain from an SQL database. When I retrieve the time series the list is composed of SQLDateTime entries that DateListPlot doesn't understand. In[24]:= t=SQLExecute[conn, "select timestamp,value from… >>> More