FOR For Loop

Section: Flow Control

Usage

The for loop executes a set of statements with an index variable looping through each element in a vector. The syntax of a for loop is one of the following: 
  for (variable=expression)
     statements
  end

Alternately, the parenthesis can be eliminated 

  for variable=expression
     statements
  end

or alternately, the index variable can be pre-initialized with the vector of values it is going to take: 

  for variable
     statements
  end

The third form is essentially equivalent to for variable=variable, where variable is both the index variable and the set of values over which the for loop executes. See the examples section for an example of this form of the for loop.

Examples

Here we write for loops to add all the integers from 1 to 100. We will use all three forms of the for statement. 
--> accum = 0;
--> for (i=1:100); accum = accum + i; end
--> accum

ans = 
 5050

The second form is functionally the same, without the extra parenthesis 

--> accum = 0;
--> for i=1:100; accum = accum + i; end
--> accum

ans = 
 5050

In the third example, we pre-initialize the loop variable with the values it is to take