# Where is Logarithm node?

Hello.

Using KY-013 Analog Temperature Sensor. In order to obtain actual temperature readings I have to do some math calculations which include a natural logarithm:

double Thermister(int RawADC) {
double Temp;
Temp = log(((10240000/RawADC) - 10000));
Temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * Temp * Temp ))* Temp );
Temp = Temp - 273.15; // Convert Kelvin to Celcius
return Temp;
}

Unfortunately, I cannot make a compound node for this sensor as there is no logarithm node in XOD. Or am I looking wrong direction?

Thank you.

Hello!

Not here yet. I added it to the pool of most wanted nodes. The logarithm is a trivial wrapper around C function, so I think we can add it in the nearest release.

Meanwhile, you can look how xod/core/sin is done and make your own log node.

Thank you.

Meanwhile, you can look how xod/core/sin is done and make your own log node.

Unfortunately, I cannot. XOD does not show implementation for sin:

I will wait for the log implementation in future version. Is there any ETA for it by any chance?

Yeah. It implemented natively in C++. The file is in C:\Users\<you>\AppData\Local\Programs\xod-client-electron\workspace\__lib__\xod\core\sin\any.cpp. You can put an any.cpp file next to your patch to make it used while transpilation… Yes, seems complex, we’ll give a tool to edit C++ right from within IDE very soon.

ETA is the end of November. Not sure, maybe we would release an intermediate version sooner than that.

We added logarithms in v0.16.0

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