For loop Problem in MATLAB Code sample

Hello to all: I have came across one MATLAB code that calculates Direction of Arrival for microphone pair with help of LMS Algorithm. In the beginning of code i am facing one problem in for loop. Code snipet is as follows:

*fs=44100; % Sampling frequency (Hz) d_micro=0.1; % Distance between microphones (m) c=340; % Speed of sound (m/s) Nmax =ceil(d_micro*fs/c); % Maximum number of samples Nmax

DESP=ceil(Nmax*1.5); %Delay we insert in the micro 2 % We leave 50% of margin of error

lengData=44100*0.5; % Number of samples in which the voice is processed

signal1=audioread('90.wav')'; % Importing the file to process.

length(signal1); % Now for loop

for k=lengData:lengData:length(signal1)

signal=signal1(1,k-(lengData-1):k); % Signal in MIC B d=signal1(2,k-(lengData-1):k); % Signal in MIC A

I have question that how this for loop works as lengData comes out to be 22050 and length(signal1) is 8272.

this means for k =22050:22050:8272 how is that possible? can anybody help me regarding this?? Thank you