How to locate files in folder or directory where I'm working?

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I wanted to ask to see if someone could help on how I could locate files in the directory or folder where I'm working and making a logic for example if the file does not exist execute a function or process, and if it does not run.
That is, I have a function that creates an output named JS:
JSFile = strcat (partitura_xml, '_', youtube_id, '_', hashname);
For example, if I look in the folder and locate a file with the name:
It would not be necessary to run the process because it already exists and is identified; and instead if I do not; would have to execute the function that creates the JS me. I hope I explained well, is like making a logical process (if there is such js not process, if there is no process or call the corresponding function) and do not know how to implement or locate or find files in the folder ...
On the other hand, I wanted to ask whether take long to make that search, for example if I have 100 files or more this search would take me a lot, because in that case would have to make a database. Thanks in advanced!

Answers (2)

Image Analyst
Image Analyst on 24 May 2016
Have you tried using dir(someFilePattern) and exist(filename, 'file')?

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Todd Leonhardt
Todd Leonhardt on 25 May 2016
The exist function should do what you want:
if 2 == exist(file name)
% Do stuff here
  1 Comment
Mario Martos
Mario Martos on 25 May 2016
Thanks you very much!
For example it would thus be the structure:
This would be the main function :
function [ ] = Preproceso_Principal ( youtube_url , partitura_xml )
JSFile = strcat ( partitura_xml , '_' , youtube_id , '_' , hashname ) ; % Output JSFile name , hash of that particular xml score .
if 2 == exist ( JSFile ) not do anything because I have it ;
How could indicate using a screen 1 for example, that this condition is met ?
And if it does not process the rest of the function to get it.
¿ Directly with that I already search and locate the folder where I 'm working ?
On the other hand , it takes a long time ? That is, if such had js files 500 , much take ? Because if not instead of it making a database

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