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Formula Builder
The Formula Builder supports a variety of argument types, depending on the specific function. Many formulas take both real numbers and time series as arguments. However, some functions will only take real numbers, and others will take only time series. There are a handful of functions that support dates. Some functions support lists. Most operations can be used in combination. To learn more about each function, view the "Syntax" tab, which will list the data type supported and will provide the appropriate syntax.
Time series
CM crypto data time series are represented by the AssetID.MetricID (e.g.,
BTC.PriceUSD) notation.
To find MetricIDs and AssetIDs use the search functions
located on the "Editor" tab. An AssetID can represent cryptoassets, exchanges, exchange-assets or indexes:
- Cryptoasset: BTC, ETH
- Exchange: COINBASE, KRAKEN
- Exchange-Asset: COINBASE-BTC, BINANCE-ETH
- Indexes: CMBI10, CMBIBTC
If an AssetID has a "-" (e.g., COINBASE-BTC), use the asset("Asset-ID").metricID notation e.g., asset("COINBASE-BTC").volume_reported_spot_usd_1d - for the time series. If a MetricID has a "." (e.g., SplyAdrBalNtv0.1), use the AssetID.metric("Metric.ID") notation (e.g., BTC.metric("SplyAdrValNtv.01") for the time series. Time series can be added, multiplied, subtracted and divided by one another (to name a few of the functions available). These operations are applied on a per-element basis. If one series does not have a value for a specific date, it is treated as zero at this date. Additionally, multiplication, division, and exponentiation can be applied by scalar and addition/subtraction by scalar on per element basis.
Integers and real numbers
Integers and real numbers can also be added, multiplied, subtracted and divided by one another. And, formulas support both integers and real numbers. The standard operators are used for these operations: addition (+), subtraction (-), multiplication (*), division (/), modulo (%) and exponentiation (^). You can also check numbers for equality (=) and they can be compared (<,>,=<, >=), which return boolean (true/false) values. Boolean values support "and", "or" and "not" operations.
Dates
Dates are often called as an argument in a formula. Internally, a date is represented as the number of milliseconds passed since January 1st, 1970. Dates are written in the date(YYYY, MM, DD) format. Numeric values can be added/subtracted to/from dates, with the number interpreted as the number of days to add/subtract (e.g., date(2016, 4, 1) + 2 will add two days, returning April 3rd, 2016. Dates can also be subtracted from each other, returning the difference in days: date(2017, 3, 5) - date(2017, 3, 3) will return 2, for instance.
Lists
Certain formulas can also be applied to lists. Lists are ordered collections of elements, similar to Python lists and Javascript arrays. Unlike Python and Javascript, the index for the first element is 1, not 0. Lists can be concatenated via the (+) operator. A list can be created using list(member0, member1, ..., membern) where members can be numbers or time series. For example, list(BTC.PriceUSD, ETH,PriceUSD) returns the list containing the two time series. Lists can be saved/named (e.g., MyList), with the saved name being used as the argument.
Subformulas
Subformulas are arguments for some functions. They are identical to anonymous functions from Javascript, Python and other programming languages, the syntax is: fn(argName_1, ..., argName_n)( ... some computation ... ). For example fn(coin)(coin.networkValueUsd / coin.txVolumeUsd) returns the subformula that computes NVT for a coin. They are useful in cases where you want to calculate some metric for multiple currencies without code duplication: metric's code can be put into the first formula and later addressed by subsequent formulas via designated name.
Operations
Operations follow the expected order of operations.
Conditional expressions
Formulas support conditional expressions with the following syntax: if (...) then (...) else (...). For example rsi.map(fn(date, value) (if value > 75 then 1 else 0)) where rsi is rsi(BTC.priceUsd, 90) draws a time series which has value of 1 on dates when BTC's 90 day RSI is higher than 75, and zero otherwise.