Plotly.js: Histograms nbinsx and nbinsy descriptions are wrong

[yankev]

Example:
After setting the nbinsx parameter to 20, the number of bins showing is 15. Also tried with other values for nbinsx, and results vary.

https://jsfiddle.net/2k0q2yg8/

[etpinard]

Ha. That's a description bug.

nbinx doesn't directly set the number of bins but the maximum number of bins allowed by the autobin algorithm. The autobin algorithm attempts to keep the bin size _nice_.

The old plot.ly workspace got this right:

i.e. that _Max # X bin_ row.

For fully custom bin sizes, you should use xbins.start, xbins.end, xbins.size.

Changing the issue accordingly.

[etpinard]

@yankev wanna try to make PR for this?