Loren on the Art of MATLAB

Results for: Indexing

Logical Indexing – Multiple Conditions 22

Posted by Loren Shure,

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.... read more >>

Partitioning a Vector 9

Posted by Loren Shure,

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.... read more >>

Meet the Neighbors 13

Posted by Loren Shure,

Some calculations in MATLAB, including, for example, calculating local means or finite differences, or applying some other filter locally, operate on neighboring matrix elements. Doing so in an efficient manner is easy under the right conditions ... read more >>

Indexing – Mixing It Up 16

Posted by Loren Shure,

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. ... read more >>

Rearranging Data 20

Posted by Loren Shure,

I can think of a lot of functions that rearrange data in MATLAB. I've long suspected that not all of these are well-known, though some are clearly daily tools. Maybe it's time to be sure they get exposure. ... read more >>

Unique Values Without Rearrangement 4

Posted by Loren Shure,

In MATLAB, the simplest form of the function unique returns the unique values contained in a numeric vector, with the results sorted. This is often acceptable, but sometimes a user prefers the results in the order originally found in the data. ... read more >>

Acting on Specific Elements in a Matrix 32

Posted by Loren Shure,

Using MATLAB, there are several ways to identify elements from an array for which you wish to perform some action. Depending on how you've chosen the elements, you may either have the list of elements to toss or the list if elements... read more >>

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