[Matplotlib-users] Equivalent of d3's step-after interpolation?
I've been doing some work with d3 http://d3js.org/ recently. It's certainly been an education... Out of the box, it supports several different types of interpolation between two points https://github.com/mbostock/d3/wiki/SVG-Shapes#line_interpolate, 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 -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Equivalent of d3's step-after interpolation?
Kinda sounds a bit like a barchart with the 'step' option, I think? On Thu, Oct 30, 2014 at 12:16 PM, Skip Montanaro s...@pobox.com wrote: I've been doing some work with d3 http://d3js.org/ recently. It's certainly been an education... Out of the box, it supports several different types of interpolation between two points https://github.com/mbostock/d3/wiki/SVG-Shapes#line_interpolate, 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 -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Equivalent of d3's step-after interpolation?
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 s...@pobox.com 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 -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Equivalent of d3's step-after interpolation?
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 -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Equivalent of d3's step-after interpolation?
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 -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Equivalent of d3's step-after interpolation?
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 pierre.haes...@crans.org 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 -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- Thomas Caswell tcasw...@gmail.com -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
