## The perfect three? Sun, Scotland and a Ferrari

Just thought I’d share a pic from this weekend.
https://imgur.com/Ghyhzhc We rarely get weather like this in Scotland (it hit 32C/90F this week), and given I live on the doorstep of some of the worlds best driving roads I thought I’d share a pic from an outstanding drive.

I’ve only had the 458 for 6 months, but feel this one is a keeper (although in the depths of winter my resolve to keep nice cars is seriously challenged!)

submitted by Nevin Manimala Nevin Manimala /u/orderLXVI

## Need advice, please. I am a non stat person trying to do chapter three of proposal.

Up until my chapter three through quan I and II I was told I could use two validated surveys with no issues. Now a committee member is saying, since my audience has never been surveyed I have to go through validating the surveys. Both surveys have been used for decades and have tons of data. I simply want to compare two surveys – how do I go about doing this in a statistical manner? I am sitting here in tears as I thought I was about ready to go to defense [we defend twice at my school – 1st prior to data gathering and then final] and now I have hit a brick wall.

submitted by Nevin Manimala Nevin Manimala /u/tends2forgetstuff

## What are your thoughts on using the @ character to denote matrix multiplication?

Python already has this feature, in the sense that the __matmul__ attribute is used to overload the ‘@’ operator.

What I’m suggesting is that ordinary juxtaposition of two matrices still denotes matrix multiplication, but when one wants to be explicit, one uses the @ character rather than cdot. In my opinion, cdot feels a bit overloaded in mathematics, and as matrix multiplication becomes more and more its own “thing,” (separate from it being a representation of a linear transformation, or more generally as some arbitrary associative operation that distributes over addition), it seems to not be that bad to use the @ character.

There are a few other things; @ is not too hard to write, it’s not super hard on the eyes (write it small).

I guess the downsides would be that cdot is always used for the multiplication operation in any ring (or seems to be the default character for it), and that @ is generally not seen in mathematics.