• if

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    statement condition.
    The general form of the if statement is

    if

    expression
    statements

    statements

    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
    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, , while, switch.

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