How multiline modes work 



Multiline mode This mode is designed for complex arithmetic expressions, where you evaluate many different parameters that depend on other parameters. Each time you press the '=' key or the 'return' key, formula calculator evaluates every expression, line by line, starting at the top. It displays the results of every expression. You make the results field larger by dragging the divider just below it. 

When in fixed order mode it is important that parameters have values before they appear in subsequent expressions, otherwise formula calculator cannot evaluate the expression. For example
cannot be evaluated since formula calculator will try to perform 2*x before x has a value. In this case you should interchange the order of the two expressions. 

In any order mode, you can type your equations in any order. Formula calculator processes the equations from top to bottom and evaluates all expressions that have values. It then repeats, processing the equations from top to bottom and tries to evaluate the expressions again. In most cases, many of the parameters encountered on the first iteration will now have values and can be evaluated. This proces is repeated until formula calculator cannot evaluate any more expressions. Because the equations are evaluated multiple times, this mode is slower. For very complicated expressions using large arrays of numbers it is more efficient to use the fixed order 
