How to find the sliding RMS of a signal by sliding a window one unit at a time along a signal?

I have codes to calculate the RMS for each window. But one window starts at the end of the previous window. I am new to MATLAB and I am struggling to modify the for loop such that the window slides along the time axis.

The data is in the form of an excel document with 2 columns that I read using the first few lines in my code.

if true
  clear all; 
Array=csvread('Pencilbreak-63dB.csv');
col1 = Array(:, 1); 
col2 = Array(:, 2); 
window = 100;
for i=1:window:length(col1)
  RMS(i:i+window-1) = (sum(col2(i:i+window-1).^2)/window)^0.5;
end
plot(col1,RMS)
end