Plotting data from a list of rules, infer axis titles from the rules with units

Question

I have data, with units, organized as a list of rules; this is so I can slice the data in different ways based on the variables represented.
I'm trying to find the most direct way to plot this and get axis titles with both the variable from the rule and unit from the values. I don't want to manually label the plots each time, so if Plot doesn't have a built-in then how can I write a function to do the inference? I'm looking for the most DRY approach possible.
This gives me the units, but not the variable names, in the labels:
data = {
   y -> {0, 33.2} (Quantity[1, ("KipsForce")/("Inches")^2]),
   x -> {0, 6} 10^-4
   };
ListLinePlot[Transpose@({x, y} /. data), AxesLabel -> Automatic]

On the same example, is it possible to retain units like "in/in"? I've done this by manually specifying the labels and using HoldForm to avoid evaluating the cancellation, but I can't get that to work with automatic labels as above.

Matt Murphy · Accepted Answer

This does everything I asked, including keeping the in/in unit:
(edit) I want to be independent of the order of data, but for now it needs to be ordered according to the axes for this to work.
data = {
   x -> {0, 6} 10^-4 Quantity["in/in"]
   y -> {0, 33.2}    Quantity["ksi"],
   };

GetLabels = # /. ((a_ -> b_) :>
  Row[{a, " ", QuantityForm@QuantityUnit@b[[1]]}]) &;

ListLinePlot[Transpose@({x,y} /. data), AxesLabel -> GetLabels@data]

(edit) More complete solution:
I changed GetLabels to take a point so the labels are ordered according to the data as it's given to Plot
data = { y -> ..., x -> ... };

points = Transpose@({x, y} /. data);
kv = (points /. ({a_, b_} :> {x -> a, y -> b}));

GetLabels = # /. ((a_ -> b_) :> 
          Row[{a, " ", QuantityForm@QuantityUnit@b}]) &;

ListLinePlot[points, AxesLabel -> style`size[16] /@ GetLabels@kv[[1]]]

kglr · Answer

ClearAll[data, x, y, assoc, labelFunc]
data = {x -> Map[Quantity[#, "in/in"] &]@({0, 6} 10^-4) , 
   y -> Map[Quantity[#, "ksi"] &]@({0, 33.2} )};

We define two Associations using data:
assoc = Association @ data;

labelingAssoc = Association @ KeyValueMap[# -> Quantity[#, #2] &] @ 
    QuantityUnit @ Map[First] @ assoc

<|x -> Quantity[x, ("Inches")/("Inches")],
   y -> Quantity[y,("KipsForce")/("Inches")^2]|>

We can map the two associations on the list of variables
ListLinePlot[Transpose[assoc /@ {x, y}], AxesLabel -> labelingAssoc /@ {x, y}]

or use them with as replacement rules
ListLinePlot[Transpose[{x, y} /. assoc],  AxesLabel -> {x, y} /. labelingAssoc]

to get

Alternatively, define a function for labeling
labelFunc = Map[Quantity[#, QuantityUnit @ First[assoc @ #]] &];

ListLinePlot[Transpose[assoc /@ {x, y}], AxesLabel -> labelFunc @ {x, y}]

Plotting data from a list of rules, infer axis titles from the rules with units

2 Answers

Add your own answers!

Ask a Question