Eval()vs.substitute()

The aim of this page is to demonstrate the difference between eval() and substitute .

Note:PGLabs is an efficient way to check code.

$f = Compute(sqrt(3x + 1);
$fx = $f->eval(x=>"3");
displays 3.16228

The correct answer is a number.

$f = Compute(sqrt(3x + 1);
$fx = $f->eval(x=>"3");
displays (3.16228)

The correct answer is a formula (hence the parenthesis)

One of the biggest differences between eval() and substitute is when they are used in conjunction with flags such as reduceConstants and reduceConstantFunctions , which is described in more detail at:FormattingCorrectAnswers