Skip to content
RaamTrade Docs
Open RaamTrade

RC2_IND_NO_COMPUTE

Indicator class must define a compute(self, ...) method.

What it means

compute() is the indicator. Everything else in the class — Param(), Series(), position, state defaults — only describes the machinery; compute() is the one thing that turns a bar into a number.

The platform calls it once per bar and stores what it returns, so a class without it has nothing to store and nothing to plot. There is no default implementation to fall back on.

Why it happens

The usual cause is a class that was written top-down and stopped at the declarations:

class MySMA(Indicator):
    position = ON_CHART
    period = Param(20, min=2, max=200)
    buffer = Series(period)

The other cause is a misspelling. The name is matched exactly — Compute, calculate, compute_value and __call__ are all “not compute”, and a class carrying only those gets this error (plus RC2_IND_METHOD for the stray method).

How to fix it

Add compute(self, ...), taking the bar fields it needs and returning the value.

class MySMA(Indicator):
    position = ON_CHART
    period = Param(20, min=2, max=200)
    buffer = Series(period)


    def compute(self, close):
        self.buffer.add(close)
        return sum(self.buffer) / len(self.buffer)

The parameters after self are the bar fields you want — any non-empty subset of close, open, high, low, volume, in any order. The platform feeds only what you ask for.