Identifying a repeating number in a large data file

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Sanwal Yousaf 2015-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/231425-identifying-a-repeating-number-in-a-large-data-file

编辑： Cedric 2015-7-29

I am trying to write a function that deals with large amount of data collected from EEG electrodes using EEG lab. I am trying to write a function that finds a number, say 9, in a large data retrieved from the experimental results and i could later use the indexing of these occurring 9s which may or may not occur at the same interval. I would also like to use this indexing of the 9 to be able to do number manipulation with the 9 and 2 numbers to its left and 2 to its right. Anybody got any ideas about the sort of functions that i should look at to achieve this??

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Answer 1

Azzi Abdelmalek 2015-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/231425-identifying-a-repeating-number-in-a-large-data-file#answer_187426

编辑：Azzi Abdelmalek 2015-7-28

在 MATLAB Online 中打开

A function that finds these numbers is find

Example:

A=[1 2 3 9 4 5 6 8 9 10 1 0 5]
idx1=A==9  
idx2=find(A==9)

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Sanwal Yousaf 2015-7-29

Could you use this to find an number from a http://www.mathworks.com/help/matlab/ref/uigetfile.html function.

Say,i use the uiget function to obtain the file, then could find still be used??

Cedric 2015-7-29

编辑：Cedric 2015-7-29

在 MATLAB Online 中打开

UIGETFILE will just give you a file name and a directory (as strings). If you do

[fileName, pathName] = uigetfile( '*.txt' ) ;

you just trigger a file selection window, which returns the location of the file. Then you have to build the full path/locator:

locator = fullfile( pathName, fileName ) ;

and then read the file content. Depending what format it is, you can use IMPORTDATA, TEXTSCAN, XLSREAD, etc. For example:

A = xlsread( locator ) ;

After reading the file, and possibly making a few data conversions, you have an array of numbers that you can process the way Azzi explained if you are looking for given exact values.

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