Inserting a variable into a string of text.

Hello everyone,

I am attempting to make a program that can split 40 different sound files into 2 second segments. I can either "hard code" it (write a program that will split just one sound file into 2 second segments) or I can use just a simple function and use if/else statements and one or more loops to achieve the same goal but with many less lines of code (I could save hundreds of lines of code!).

At the moment I have something like this:

filename01='BASSOON\01_AchGottundHerr_bassoon.RESYN.wav';

[y, fs] = audioread(filename01); 
samples = length(y);
duration = 2; % seconds
buffer  = fix(duration*fs); % samples 
nb_of_buffers = fix(samples/buffer); % NB : no overlap
for k = 1:nb_of_buffers
    ind_start = 1+(k-1)*buffer; 
    ind_stop = ind_start+buffer-1;
    filename01 = sprintf('Bassoon01-%d.wav', k);
    audiowrite(filename01,y(ind_start:ind_stop,:),fs)
end
mkdir Bassoon_snippet01
Bassoon01 = dir('C:\Users\adilp\Desktop\Bach10-mf0-synth\audio_stems_sound\*.wav');
for k = 1:numel(Bassoon01)
   Name = Bassoon01(k).name;
    if contains(Name,'Bassoon01') 
    Instrument = 'Bassoon_snippet01';
    end
     movefile(Name,Instrument);
end
movefile('Bassoon_snippet01','C:\Users\adilp\Desktop\Bach10-mf0-synth\audio_stems_sound\BASSOON');

It works for one file! But I would need to do the same thing forty times! I would have several hundred lines of code and that is simply inefficient.

I am attempting to incorporate an if else statement and/or a loop if necessary, but it does not seem to accomplish much.

%for n = 1
 if n == 1
    filename0n='BASSOON\01_AchGottundHerr_bassoon.RESYN.wav';
 elseif n == 2
     filename0n='BASSOON\02_AchLiebenChristen_bassoon.RESYN.wav';
 elseif n==3
     filename0n='BASSOON\03_ChristederdubistTagundLicht_bassoon.RESYN.wav';
    end
[y, fs] = audioread(filename0n); % I need a way to incorporate 'n'
samples = length(y);
duration = 2; % seconds
buffer  = fix(duration*fs); % samples 
nb_of_buffers = fix(samples/buffer); % NB : no overlap
for k = 1:nb_of_buffers
    ind_start = 1+(k-1)*buffer; 
    ind_stop = ind_start+buffer-1;
    filename0n = sprintf('Bassoon0n-%d.wav', k); % I need a way to incorporate 'n'
    audiowrite(filename0n,y(ind_start:ind_stop,:),fs) % I need a way to incorporate 'n'
end
mkdir Bassoon_snippet0n % I need a way to incorporate 'n'
Bassoon0n = dir('C:\Users\adilp\Desktop\Bach10-mf0-synth\audio_stems_sound\*.wav');
for k = 1:numel(Bassoon0n) % I need a way to incorporate 'n'
   Name = Bassoon0n(k).name;    % I need a way to incorporate 'n'
    if contains(Name,'Bassoon0n') % I need a way to incorporate 'n' 
    Instrument = 'Bassoon_snippet0n'; % I need a way to incorporate 'n'
    end
     movefile(Name,Instrument);
end
movefile('Bassoon_snippet0n','C:\Users\adilp\Desktop\Bach10-mf0-synth\audio_stems_sound\BASSOON'); % I need a way to incorporate 'n'

%end

I believe all I really need is a way to incorporate a variable 'n' into some character strings, where n is a positive integer with values 1 , 2 , ... , 8 , 9 in and is formatted in such a manner that 0n is 01, 02 , ... , 08 , 09. I hope this question is understandable.

Thank you very much!

[Walter Roberson]

Not recommended!

http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Consider using a cell array instead of numbered variables.

And you can use sprintf, such as

instr_n = sprintf('Bassoon%02d', n);
if contains(Name,instr_n)

[Adil Patel]

Where would

instr_n = sprintf('Bassoon%02d', n);
if contains(Name,instr_n)

Go?

Thank you.

[Adil Patel]

And how would a cell array impact an if else statement?

[Adil Patel]

You can use my exact code if you want to explain something.