for loop function help

i don't have a specific example but could someone explain the for loop function - i find it very confusing.

if someone could explain for i, else, elseif please

Answer 1

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help for

 FOR    Repeat statements a specific number of times.
    The general form of a FOR statement is:
  
       FOR variable = expr, statement, ..., statement END
  
    The columns of the expression are stored one at a time in
    the variable and then the following statements, up to the
    END, are executed. The expression is often of the form X:Y,
    in which case its columns are simply scalars. Some examples
    (assume N has already been assigned a value).
  
         for R = 1:N
             for C = 1:N
                 A(R,C) = 1/(R+C-1);
             end
         end
  
    Step S with increments of -0.1
         for S = 1.0: -0.1: 0.0, do_some_task(S), end
 
    Set E to the unit N-vectors
         for E = eye(N), do_some_task(E), end
 
    Long loops are more memory efficient when the colon expression appears
    in the FOR statement since the index vector is never created.
 
    The BREAK statement can be used to terminate the loop prematurely.
 
    See also PARFOR, IF, WHILE, SWITCH, BREAK, CONTINUE, END, COLON.

    Documentation for for
       doc for

    Other uses of for

       matlab/for

help if

 IF Conditionally execute statements.
    The general form of the IF statement is
 
       IF expression
         statements
       ELSEIF expression
         statements
       ELSE
         statements
       END
 
    The statements are executed if the real part of the expression 
    has all non-zero elements. The ELSE and ELSEIF parts are optional.
    Zero or more ELSEIF parts can be used as well as nested IF's.
    The expression is usually of the form expr rop expr where 
    rop is ==, <, >, <=, >=, or ~=.
 
    Example
       if I == J
         A(I,J) = 2;
       elseif abs(I-J) == 1
         A(I,J) = -1;
       else
         A(I,J) = 0;
       end
 
    See also RELOP, ELSE, ELSEIF, END, FOR, WHILE, SWITCH.

    Documentation for if
       doc if

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Thank you