[Matplotlib-users] Equivalent of d3's "step-after" interpolation?

2014-10-30 Thread Skip Montanaro 
I've been doing some work with d3  recently. It's
certainly been an education... Out of the box, it supports several
different types of interpolation between two points
, which
I've found quite useful. It allows me to focus on assembling my data, and
not worry about transforming it to achieve the desired visual effect. For
example, in trading markets, once a trade is seen at a certain price, X,
it's useful to think of that price holding until the next trade price seen
at Y. With d3's "step-after" interpolation, given two points, (t0, X) and
(t1, Y), instead of drawing a single line between the two points, it draws
a horizontal line between (t0, X) and (t1, X), then a vertical line between
(t1, X) and (t1, Y).

I've don't a bit of searching, but didn't find anything obviously like this
in matplotlib. Does it support such a feature?

Thx,

Skip
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Re: [Matplotlib-users] Equivalent of d3's "step-after" interpolation?

2014-10-30 Thread Benjamin Root 
Kinda sounds a bit like a barchart with the 'step' option, I think?

On Thu, Oct 30, 2014 at 12:16 PM, Skip Montanaro  wrote:

> I've been doing some work with d3  recently. It's
> certainly been an education... Out of the box, it supports several
> different types of interpolation between two points
> , which
> I've found quite useful. It allows me to focus on assembling my data, and
> not worry about transforming it to achieve the desired visual effect. For
> example, in trading markets, once a trade is seen at a certain price, X,
> it's useful to think of that price holding until the next trade price seen
> at Y. With d3's "step-after" interpolation, given two points, (t0, X) and
> (t1, Y), instead of drawing a single line between the two points, it draws
> a horizontal line between (t0, X) and (t1, X), then a vertical line between
> (t1, X) and (t1, Y).
>
> I've don't a bit of searching, but didn't find anything obviously like
> this in matplotlib. Does it support such a feature?
>
> Thx,
>
> Skip
>
>
>
>
> --
>
> ___
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>
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Re: [Matplotlib-users] Equivalent of d3's "step-after" interpolation?

2014-10-30 Thread Sterling Smith 
http://stackoverflow.com/questions/8921296/how-do-i-plot-a-step-function-with-matplotlib-in-python

On Oct 30, 2014, at 11:29AM, Benjamin Root wrote:

> Kinda sounds a bit like a barchart with the 'step' option, I think?
> 
> On Thu, Oct 30, 2014 at 12:16 PM, Skip Montanaro  wrote:
> I've been doing some work with d3 recently. It's certainly been an 
> education... Out of the box, it supports several different types of 
> interpolation between two points, which I've found quite useful. It allows me 
> to focus on assembling my data, and not worry about transforming it to 
> achieve the desired visual effect. For example, in trading markets, once a 
> trade is seen at a certain price, X, it's useful to think of that price 
> holding until the next trade price seen at Y. With d3's "step-after" 
> interpolation, given two points, (t0, X) and (t1, Y), instead of drawing a 
> single line between the two points, it draws a horizontal line between (t0, 
> X) and (t1, X), then a vertical line between (t1, X) and (t1, Y).
> 
> I've don't a bit of searching, but didn't find anything obviously like this 
> in matplotlib. Does it support such a feature?
> 
> Thx,
> 
> Skip
> 
> 
> 
> --
> 
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Re: [Matplotlib-users] Equivalent of d3's "step-after" interpolation?

2014-10-30 Thread Skip Montanaro 
Benjamin> Kinda sounds a bit like a barchart with the 'step' option, I think?

Almost, but not quite. I think of barcharts as displaying truly
discrete data, often with the dependent variable being a count of some
sort and the independent variable being a bucket. In my example, while
prices X and Y are constrained to be discrete by the nature of the
market (US stocks trade in one cent increments, for example), they are
connected in time, and there is no fixed "bucket" size (time
increment).

Sterling> 
http://stackoverflow.com/questions/8921296/how-do-i-plot-a-step-function-with-matplotlib-in-python

Thanks, that's exactly what I needed. I wasn't using the correct terms
when searching Google. I was thinking "interpolation," not "step
function."

Skip

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Re: [Matplotlib-users] Equivalent of d3's "step-after" interpolation?

2014-10-30 Thread Pierre Haessig 
You might also be interested in 
http://stackoverflow.com/questions/15188005/linestyle-in-matplotlib-step-function
which details the `drawstyle` parameters. It can be set to 'steps-post' 
for example.

The only case I was not able to cover with this parameter are the 
fill_between plots, because they do not use Line objects...

-- 
Pierre

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Re: [Matplotlib-users] Equivalent of d3's "step-after" interpolation?

2014-10-30 Thread Thomas Caswell 
https://stackoverflow.com/questions/12841847/step-function-in-matplotlib/12846384#12846384
is a much better example of how to control the step function.

On Thu, Oct 30, 2014 at 1:01 PM, Pierre Haessig
 wrote:
> You might also be interested in
> http://stackoverflow.com/questions/15188005/linestyle-in-matplotlib-step-function
> which details the `drawstyle` parameters. It can be set to 'steps-post'
> for example.
>
> The only case I was not able to cover with this parameter are the
> fill_between plots, because they do not use Line objects...
>
> --
> Pierre
>
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-- 
Thomas Caswell
tcasw...@gmail.com

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