How to write a pattern for any different values

Hello,

Sorry if my title does not make much sense. Basically, I want to use the strfind command on the variable X. I've attached it in an excel file. I want to simply find the places that the variables changes from one number to another, but I'm not exactly sure how to write this pattern. How should I do this?

[Noah Kilps]

I forgot to attach the file, here it is.

Answer 1

[Steve Eddins]

T = readtable('matlab_question2.csv');
idx = find(diff(T.x))


idx =

         119
         314
         351
         381
         ...         

The first line reads your CSV file into a table that contains the variable x.

The function diff computes the differences between adjacent elements of its input.

The function find then returns the indices where the adjacent element differences are nonzero. These are the locations where the values change. For example:

>> idx(1)

ans =

   119

>> T.x(117:121)

ans =

   56.3279
   56.3279
   56.3279
         0
         0

[Adam Danz]

My very-similar approach,

M = readmatrix('matlab_question2.csv');
change = [false; diff(M)~=0];

where 'change' is a logical vector identifying the rows where the value has changed.

[Noah Kilps]

Thank you, this worked great!

[Image Analyst]

Can you please "Accept this answer"?

[Steve Eddins]

Adam, I keep forgetting that readmatrix has already shipped, lol.