for

For loop is useful for executing many iterations of a statement.

Syntax

for X = expression
  statement
end

x: Anything that can be logically tested.; Type: double | char | logical | struct | cell | integer; Dimension: scalar | vector | matrix
expression: Anything that has a valid array or a valid expression comprised of the initial value, step (optional), and end value.

Simple for loop:

sum=0
for j=1:10
  sum = sum + j
end
sum

sum = 0
sum = 1
sum = 3
sum = 6
sum = 10
sum = 15
sum = 21
sum = 28
sum = 36
sum = 45
sum = 55
sum = 55

Two-dimensional array as an expression:

for j = [-1,0;3,-2]
  disp(j)
end

[Matrix] 2 x 1
-1
 3
[Matrix] 2 x 1
 0
-2

One-dimensional array:

expr = [-1:0.5:2];
mult = 1;
for j = expr
  mult = mult .* expr;
end
mult

mult = [Matrix] 1 x 7
-1.00000  -0.00781  0.00000  0.00781  1.00000  17.08594  128.00000

Initial value, step, and end value:

val = 10;
for j = 5:-1:1
  val = val - j
end

val = 5
val = 1
val = -2
val = -4
val = -5