Comments (10)
we've got stack/unstack. Someone should sit down and try to figure out if that's good enough or if we need additional functionality.
from dataframes.jl.
I'm sure you guys are aware of the [reshape] and [reshape2]. Also worth considering is the find/sparse functions in Matlab that kind of do similar things and are a really classic design.
from dataframes.jl.
I find that the stack
/ unstack
API is much less helpful than the cast
/ melt
API. At some point, I'd like to go through and clean this up.
from dataframes.jl.
The existing stack(df, ["colX", "colY"]
is equivalent of Hadley's melt(df, measure.vars = c("colX", "colY")
. I added versions of melt
and melt_df
that use stack
and stack_df
. The only difference really is that the melt
functions prefer id_vars
.
That was the easy part. cast
is the tough one.
from dataframes.jl.
It would be really nice to use id_vars
instead. That's just a set complement, right?
from dataframes.jl.
Yes it is. That's what the new melt
does. If df has columns x1 through x4, melt(df, ["x1", "x2"])
is the same as stack(df, ["x3","x4"])
. Both functions also allow three arguments.
from dataframes.jl.
Ah. Much better! This is looking really promising.
from dataframes.jl.
More changes here. I added a simplistic pivot_table
function. The purpose is like Hadley's dcast
or Wes's pivot_table
. The format is pivot_table(d, R, C, D, fun)
where R and C are vectors indicating columns that are to be pivoted to either rows or columns in the results. D is the column to take for data. fun
is the function to apply to aggregate (defaults to mean
if left off).
from dataframes.jl.
Also, I changed to argument order for unstack
to match that of pivot_table
.
from dataframes.jl.
I'm closing as we've got most basics between stack
, unstack
, melt
, and pivot_table
. pivot_table
is like Hadley's cast. It's still fairly limited, so folks can add specific feature requests.
from dataframes.jl.
Related Issues (20)
- Add comparison function for dataframes which can handle both isapprox and isequal column types HOT 2
- unique fails with column-type FixedDecimal HOT 5
- mapcols! should modify the parent of a SubDataFrame HOT 11
- Feature request: Pairs in stack HOT 2
- Grouped DataFrame with array elements fails to combine HOT 4
- error when combining a grouped empty dataframe using `first` HOT 6
- Short circuit && on subset? HOT 1
- Integer strings as colnames/selectors are error prone HOT 2
- Suggestion - Matrix Syntax for hcat (as well as vcat) HOT 4
- Document custom generation of column names in manual HOT 9
- `join` should not introduce `Missing` types to schema HOT 1
- Consider removing Tables.allocatecolumn in vcat
- DataFrame(t::Table) converts PooledVector columns HOT 2
- Sampling GroupedDataFrames (rand) HOT 5
- Julia 1.12.0-DEV: testing DataFrames throws a 'method dispatch ambiguities' error HOT 2
- Add options to `join` missing error? HOT 1
- Column types seem to change after inner-join between two DataFrames HOT 1
- using propertynames on GroupedDataFrame HOT 6
- Very slow to convert DBInterface (DuckDB) result HOT 1
- Add arbitrary matching function for joins HOT 3
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from dataframes.jl.