Today I'd like to introduce a guest blogger, Stephen Doe, who works for the MATLAB Documentation team here at MathWorks. In today's post, Stephen discusses how to take advantage of recent performance improvements when indexing into tables. The same approach applies to many different data types. While the release notes describe the performance improvements, in today's post Stephen also offers further advice based on a simple code example.... 続きを読む >>

Indexing is a popular topic I write about from time to time. Today I want to focus on what happens when there are duplicate indices.... 続きを読む >>

Recently a customer asked me an interesting question about a good way to compute something. Before I sat down to tackle it, I happened to mention the problem to my pal, Sean. And he quickly answered, "max logical". It took me just a moment to realize what he was saying, and it is the answer to the problem. But when I heard it, I heard a person's name "Max Logical", and though I didn't know who that was, I immediately thought of Maxwell Smart, from the 60s tv comedy in the US, called "Get Smart".... 続きを読む >>

I have talked about indexing a bunch of times in the past, including my last post. Recently I have visited quite a few customers who still get tripped up a bit sometimes. So I thought I'd try again.... 続きを読む >>

I have talked about indexing a bunch of times in the past. Recently I have visited quite a few customers who still get tripped up a bit sometimes. So I thought I'd try again.... 続きを読む >>

I just got asked a question about a good way to find the closest value in a vector that was less than a threshold. My solution is fairly short, and demonstrates some of my favorite MATLAB techniques. I will compare also show you an "obvious" solution.... 続きを読む >>

I've talked about logical indexing before in some of the linked posts, but recent work makes me want to show it off again. One of the nice things about logical indexing is that it is very easy and natural to combine the results of different conditions to select items based on multiple criteria.... 続きを読む >>

Recently on the MATLAB newsgroup, there was a thread asking how to split up a vector into pieces which were each monotonically increasing by the value 1. The post got several answers which I did not read first. Here's my thinking.... 続きを読む >>

Some calculations in MATLAB, including, for example, calculating local means or finite differences, or applying some other filter locally, operate on neighboring matrix... 続きを読む >>

I've written a bunch of posts related to indexing, but I still haven't showed all the flexibility allowed. Today I'm going to add a variant to the list. ... 続きを読む >>