CODEWITHSUNDEEP
node-red
aurelius
aurelius

Reputation: 528

Math in a NodeRed function block

I am trying to do a math function in a function-block in Node-RED but it can only handle easier task like multiply.

I am trying to do this function but it can't handle the exponents(^). Perhaps there is a math function or something to declare this? It just returns a wacko number as it is now.

msg.payload = (6*10^47)/(msg.payload^16.66);
return msg;

Upvotes: 1

Views: 11223

Answers (2)

George
George

Reputation: 2120

You can use the cmath header which contains the pow function, in your case it would look something like: 

#include <cmath>

msg.payload = (6*std::pow(10,47))/(std::pow(msg.payload,16.66));
return msg;

The number returned is the first parameter raised by the second.

Upvotes: 3

Hatted Rooster
Hatted Rooster

Reputation: 36513

The ^ operator doesn't do what you think it does, it's the bitwise XOR operator.

If you want to raise something to the power of x use pow:

#include <cmath>
std::pow(msg.payload, 16.66);

Upvotes: 2

Related Questions