[Moose-dev] Re: Roassal histogram bars left shifted

Hi Chris,

2017-06-16 14:06 GMT-03:00 Chris Cunningham cunningham.cb@gmail.com:

Hi, I suspect your issue I want a bug per se.

I didn't understood that.

Your x axis starts at the first bar x location. The bars are going to be centered on the point - meaning it will overlap to the left (or negative) side.

So my Axis X starts at 572. My minPoint is 592.

So why the first bar is shifted to the left?

Anyway, I had to manually substract to adjust the minPoint:

minPoint := ((bins reject: #isEmpty) detectMin: #size) anyOne size - 28.

As for the gaps I suspect that has to do with the data. The bars have a width and the space between each point is very small - so there will be overlap. And space for x values that aren't in your data (giving you the gaps).

Did you want instead each bar next to the next and individually labbeled?

I want each bar next to the next, I think I never saw a histogram with overlapped bars. Somehow matplotlib got this right:

http://biopython.org/DIST/docs/tutorial/Tutorial.html#htoc295

Cheers,

Hernán

On Jun 14, 2017 10:16 PM, "Hernán Morales Durand" hernan.morales@gmail.com

wrote:

...

Hi guys,

I am experiencing a problem visualizing histograms in Roassal with Pharo 5. In the attached image you can observe the first bar shape starts from a negative X axis value, where I want to start from 0. Besides, some bars are gapped but I don't know why.

I am using with the following code:

| bins minPoint g ds |

bins := self groupedBySeqLengthDistribution: binNumber.
minPoint := ((bins reject: #isEmpty) detectMin: [ : c | c size ])

anyOne size.

" Build diagram "
g := RTGrapher new
        extent: 500 @ 200;
        minX: minPoint;
        withoutOrigin;
        yourself.
ds := RTData new
    points: bins;
    x: [ : c | c ifEmpty: [ minPoint ] ifNotEmpty: [ : d | d anyOne

size ] ]; y: #size. ds barShape borderColor: Color black; color: aColor; width: barWidth. g add: ds.

" Configure axis settings "
g axisY
    title: axixYLabel;
    color: Color black;
    noDecimal.
g axisX
    noDecimal;
    fromPoint: minPoint;
    color: Color black;
    title: axisXLabel.
" Open visualization in a new window "
g open.

Any idea what I am missing?

Cheers,

Hernán

---

Moose-dev mailing list Moose-dev@list.inf.unibe.ch https://www.list.inf.unibe.ch/listinfo/moose-dev

---

Moose-dev mailing list Moose-dev@list.inf.unibe.ch https://www.list.inf.unibe.ch/listinfo/moose-dev