Matlab Initial value step end:: x=a:b:c What does it mean?

Example 1Calculate int (sin (x), 0,PI)
  
 

   
  
 
   
%by Dynamic 
 
   
%all rights reserved by www.matlabsky.com 
 
   
> >x=0:pi/100:2*pi; 
 
   
>>y=sin (x); 
 
   
>>z=trapz (x, y)% or use z = Pi/100*trapz (y) 
 
   
z = 
 Li style= "margin:0px 0px 0px 30px; padding:0px; border:0px; List-style:decimal ">       1.0300e-017 
   
>>z = Pi/100*trapz (y) 
 
  
  
 

X=a:b:c refers to an array starting with a, step B, and a final value of C. Like R=1:3:9; r=[1 4 7]

R=1:3:9 and R=1:3:8 are equal.

1 is the starting value, 3 is the step, add to 7 time plus 3 is 10, than 8 or 9 is large, so r=1:3:9 and R=1:3:8 get the sequence is to 7 end

Matlab Initial value step end:: x=a:b:c What does it mean?