Comments (4)
Thinking about how this relates to uses of variable names across the API, this seems related to the inconsistent handling of indices in variable names between draws_rvars and the other formats (see here: #208 (comment))
One thought is to fix the above-referenced issue so that something like variables(x, with_indices = TRUE)
(default) returns names like x[1,1]
, x[1,2]
, ... and variables(x, with_indices = FALSE)
returns names like x
. Then have clear indications in the API of which functions take variable names with or without indices.
For this issue specifically, following the pattern of extract_variable_matrix()
we could have an extract_variable_array(x, variable)
that takes a variable name without indices and returns its array form. Then the solution in the above example would be extract_variable_array(x, "z_1")[1,,]
.
If we also want a solution specifically for getting one draw regardless of shape, then there is helper code used by for_each_draw that could be extracted and adapted for that purpose.
from posterior.
Cool, happy to take a stab at it.
from posterior.
I did also notice the index-inconsistency, and like the idea of with_indices
extract_variable_array
would work for me (the first use case is stan-dev/cmdstanr#876)
from posterior.
I agree. Sounds like a good solution.
from posterior.
Related Issues (20)
- should remove_variables be exported? HOT 4
- Dealing with chains of different length HOT 1
- rvar strange behavior HOT 2
- Add functions for PIT and LOO-PIT HOT 6
- .args in summarise draws incompatible with summary functions without ellipses HOT 10
- `pareto_khat(..., tail="both")` returns NA if just one tail is constant
- pareto diagnostics return named values, preventing renaming
- validate_weights allows NaN and NA weights
- [FR] Allow as_draws_dt for data.table HOT 9
- New draws_tensor format? HOT 4
- Applying a function to each chain HOT 1
- In summarise draws, a function that returns a character changes all columns to character HOT 4
- export ps_khat_threshold HOT 4
- pareto_khat should always return the same data structure
- `ps_khat_threshold` can return values greater than 0.7 HOT 2
- Errors when `rvar` is made from a data frame HOT 3
- subset_draws duplicates variables if `variables` argument contains `NA` HOT 4
- New CRAN release? HOT 14
- default for `r_eff` in `pareto_smooth()` and `pareto_khat()` differ
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from posterior.