Hello, I’m wondering if there is a way to extract scalar values using InfluxDB 1.8? I am trying to find a mean of a column, and then use that value in a map function. To do this I need to store the mean value as a float, but the only way I’ve seen to do that is with findColumn() or findRecord() which are only for InfluxDB 2.0.

This is a representation of my current code:

```
import "math"
getInitialMean = (bucket, start, stop, measure, path, direction) => {
mean = from(bucket: bucket)
|> range(start:start, stop: stop)
|> filter(fn: (r) => r._measurement == measure)
|> filter(fn: (r) => r.path == path)
|> filter(fn: (r) => r.pos == direction)
|> mean()
|> toFloat()
|> yield(name: "${direction} mean")
return float(v: mean._value)}
x = getInitialMeans(...)
y = getInitialMeans(...)
getDistance = (tables=<-, xAvg=x, yAvg=y) => {
xTable =
tables
|> filter(fn: (r) => r.pos == "X")
|> map(fn: (r) => ({ r with
x_squared:
math.pow(x:r._value - xAvg, y:2.0)
})
)
yTable =
tables
|> filter(fn: (r) => r.pos == "Y")
|> map(fn: (r) => ({ r with
y_squared:
math.pow(x:r._value - yAvg, y:2.0)
})
)
combined =
join(tables: {xTable:xTable, yTable:yTable}, on: ["_time"])
|> map(fn: (r) => ({ r with
dist:
math.sqrt(x: r.x_squared + r.y_squared)
})
)
return combined
}
```

I am getting this error code- `500 Internal Server Error: {"error":"compile function @ 25:16-28:11: type error 27:9-27:43: float != nil"}`

This is refering to this line "`math.pow(x:r._value - xAvg, y:2.0)"`

and it is saying that xAvg is nil.