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Envision Reference

This section catalogues the features and capabilities of both the Envision language and its standard library. This section is intended for an advance audience who has already mastered the Envision basics.

Table of contents

Keywords

The list of words that have built-in semantic in Envision.

Reserved keywords: and as at auto autodiff by const cross def default delete desc each else enum expect export fail false for group if import in into keep loop match mod montecarlo not or order over params process read return sample scan show sort span table then true unsafe when where with write

Contextual keywords: assert barchart boolean chart date flagset form histogram interval label latest linechart logo max min markdown month nosort number partitioned piechart plot private pure ranvar scatter scalar single slicepicker slicetree small summary tabs text upload week whichever zedfunc

Keywords reservd for later: define draw foreach index until while

Operators

The operators below are listed in increasing order of precedence. For instance, since and is before or, then A or B and C is interpreted as A or (B and C). Operators with the same precedence are grouped left-to-right: A * B / C is (A * B) / C.

..
if then else
(unary) + - ~ not
^
(binary) * / /. mod
+ -
(comparisons) < > <= >= == != ~~ !~ in
and
or
into
...
[]
.

Aggregators

The aggregators are similar to functions, but they benefit from a richer syntax with options. Below, we list the aggregators supported by Envision.

Basic: argmax argmin argwhichever areSame count distinct distinctapprox max min product single sum

Logic: all any same whichever

Ordered: changed concat first join last smudge

Statistics: avg entropy median mode percentile stdev stdevp

Ranvar: mixture ranvar ranvar.buckets sum

Zedfunc: sum

Functions

The primary purpose of functions is to extend the capabilities of Envision whenever the basic language syntax would not be sufficient. Below, we list the functions supported by Envision.

Mathematics: abs arground ceiling cos exp expsmooth floor log logGamma loglikelihood.logLogistic loglikelihood.normal loglikelihood.negativeBinomial loglikelihood.poisson max min noGrad percent random.binomial random.integer random.logLogistic random.negativeBinomial random.normal random.poisson random.shuffle random.uniform ratio regularizationTerm round roundNext sin sqrt tanh