Identical axis labels removed in heatmap (need new category mode or axis type)

Consider the following plot (as JSON):

{'layout': {u'margin': {u'r': 60, u'b': 60, u't': 60, u'l': 60}}, 'data': [{u'zmax': 1.0054633722786, u'colorscale': u'Viridis', u'zmin': -1.4410649905944, u'y': [u'a', u'b', u'a'], u'x': [u'd', u'd'], u'z': [[-0.50443826056116, -0.55385051210768], [-0.52712315391279, 1.0054633722786], [-1.4410649905944, 0.50761805140936]], u'type': u'heatmap'}]}

Note how there are identical axis labels in the JSON on the x and y-axis. This leads to an incorrect rendering:

It appears the identical labels get removed automatically.

Additional context here and here.

[cpsievert]

Another workaround would be to use ticktext/tickvals:

http://codepen.io/cpsievert/pen/bqKJoe

[LeUser111]

Hey guys!

A little late to the party - however we’ve just run into this exact issue with the stacked-bar-chart. We are trying to display the properties of tools that are used in a process. Of course tools can be used multiple times.

Thanks to the solution of @cpsievert it works like a charm! (Thank you very much!).

Here’s a simple example where I just mixed the example code for stacked-bar-charts with the solution proposed by @cpsievert :

var trace1 = { 
  y: [20, 14, 23],
  name: 'Primary Processing',
  type: 'bar'
};

var trace2 = { 
  y: [12, 18, 29],
  name: 'Secondary Processing',
  type: 'bar'
};

var data = [trace1, trace2];
var layout = {barmode: 'stack', "xaxis": {
    "ticktext": ["tool1", "tool2", "tool1"], "tickvals": [0, 1, 2]
  }};

Plotly.newPlot("graph", data, layout);

The reason why I’m posting this:

Would you kindly consider adding this information to the official documentation? (e.g. here)

As this issue shows it’s not an uncommon requirement and since there is a practical solution for this it would be great if it was described close to the charts themselves - maybe as an additional example (e.g. “bars with multiple occurrences of x-values”).

(Sorry if it’s already there and I just missed it!)