Compile and evaluate separately

[markhats]

I may be wrong, but it looks like when you call expression.evaluate({ x: 1 }), it compiles it into a JS function every time before evaluating. Is it possible to compile the expression just once and then call evaluate many times on the compiled function, passing in different values for x? This would make it much faster than compiling every time.

The equivalent math.js workflow would be:

const node = math.parse(expr)         // parse expression into a node tree
const code = node.compile()           // compile the node tree
const result = code.evaluate([scope]) // evaluate the code with an optional scope

where the final evaluate could be called multiple times without recompiling.

[markhats]

I have got this working now I think. It's a little strange but the equivalent of the above math.js workflow is:

const expression = MathExpression.fromText(expr)
const evalFunc = expression.f()
const result = evalFunc([scope])

[dqnykamp]

Yep, that's exactly how to separate the compile and evaluate steps. If you have suggestions for making it more natural, let us know.

…

On Thu, Apr 16, 2020 at 7:03 AM markhats ***@***.***> wrote: I have got this working now I think. It's a little strange but the equivalent of the above math.js workflow is: const expression = MathExpression.fromText(expr) const evalFunc = expression.f() const result = evalFunc([scope]) — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#30 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAH5GAEXGDUFJBGUQ3FCG7TRM3XX5ANCNFSM4MJM6TOA> .

-- Duane Nykamp School of Mathematics University of Minnesota 202 Vincent Hall 206 Church St. SE Minneapolis, MN 55455 www.math.umn.edu/~nykamp

[markhats]

I guess I was just expecting something similar to math.js, with separate compile and evaluate functions. It's fine though, now I know how to do it.