abstract struct Crysda::DataCol

• Crysda::DataCol
• Struct
• Value
• Object

Direct Known Subclasses

• Crysda::AnyCol
• Crysda::BoolCol
• Crysda::DateTimeCol
• Crysda::DFCol
• Crysda::Float64Col
• Crysda::Int32Col
• Crysda::Int64Col
• Crysda::StringCol

Defined in:

crysda/columns.cr

Constructors

• .new(name : String)

Instance Method Summary

• #*(val : Number)
• #*(val : DataCol)
• #+(val : Number)
• #+(val : DataCol)
• #+(val : Iterable)
• #+(val : String)
• #-(val : Number)
• #-(val : DataCol)
• #-
• #/(val : Number)
• #/(val : DataCol)
• #<(val : Any | DataCol)
• #<=(val : Any | DataCol)
• #==(i : Any)
• #==(other : self)
• #>(val : Any | DataCol)
• #>=(val : Any | DataCol)
• #[](*args, **options)
• #[](*args, **options, &)
• #[]?(*args, **options)
• #[]?(*args, **options, &)
• #apply(&block : Any -> Any) : DataCol

  Apply a function to each non-null value

• #as_b
• #as_f64
• #as_i
• #as_i64
• #as_s
• #between(min_val, max_val) : Array(Bool)

  Check if numeric values are between min and max (inclusive)

• #bfill : DataCol

  Backward fill nulls (propagate next valid value)

• #clip(min_val, max_val) : DataCol

  Clip values to a range

• #clip_lower(min_val) : DataCol

  Clip values to minimum

• #clip_upper(max_val) : DataCol

  Clip values to maximum

• #coalesce(other : DataCol) : DataCol

  Column-level coalesce - return first non-null from self or other

• #compare(left : Int32, right : Int32, null_last = true) : Int32
• #cumsum
• #cut(bins : Array(Number), labels : Array(String) | Nil = nil, right : Bool = true) : StringCol

  Bin values into discrete intervals (like pandas cut) bins: Array of bin edges (must be sorted ascending) labels: Optional labels for each bin (size must be bins.size - 1) right: If true (default), bins are (left, right], otherwise [left, right)

• #desc
• #div(val)
• #equals(other : self)
• #ffill : DataCol

  Forward fill nulls (propagate last valid value)

• #first : Any

  Get first non-null value from column

• #has_nulls?
• #hash(hasher)

  See Object#hash(hasher)

• #in?(set : Array) : Array(Bool)

  Check if values are in a given set

• #is_in(set : Array) : Array(Bool)

  Check if values are in a given set (alias)

• #is_na
• #is_not_na
• #lag(n = 1, default : Any = nil)
• #last : Any

  Get last non-null value from column

• #lead(n = 1, default : Any = nil)
• #map(&)
• #matching(missing_as = false, &) : Array(Bool)
• #max(remove_na = false)
• #mean(remove_na = false)
• #median(remove_na = false)
• #min(remove_na = false)
• #minus(val)
• #name : String
• #nunique : Int32

  Count of unique values

• #order(na_last = true)
• #pct_change : DataCol
• #plus(val)
• #qcut(q : Int32, labels : Array(String) | Nil = nil) : StringCol

  Quantile-based binning (like pandas qcut) q: Number of quantiles (e.g., 4 for quartiles, 10 for deciles) labels: Optional labels for each bin

• #rank(na_last = true)
• #sd(remove_na = false)
• #size(*args, **options)
• #size(*args, **options, &)
• #str_contains(pattern : String | Regex, case_sensitive : Bool = true) : Array(Bool)

  Check if strings contain a pattern

• #str_downcase : StringCol

  Convert strings to lowercase

• #str_ends_with(suffix : String, case_sensitive : Bool = true) : Array(Bool)

  Check if strings end with suffix

• #str_extract(pattern : Regex) : StringCol

  Extract regex pattern from strings

• #str_len : Int32Col

  Get string lengths

• #str_replace(pattern : String | Regex, replacement : String) : StringCol

  Replace pattern in strings

• #str_slice(start : Int32, length : Int32 | Nil = nil) : StringCol

  Substring extraction

• #str_starts_with(prefix : String, case_sensitive : Bool = true) : Array(Bool)

  Check if strings start with prefix

• #str_strip : StringCol

  Strip whitespace from strings

• #str_upcase : StringCol

  Convert strings to uppercase

• #sum(remove_na = false)
• #times(val)
• #to_s(io : IO) : Nil

  Same as #inspect(io).

• #to_s

  Returns a nicely readable and concise string representation of this object, typically intended for users.

• #unique : Array

  Get unique values in the column

• #values : Array

Constructor Detail

Instance Method Detail