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From: Christopher Barker <Chris.B<arker@no...>  20090506 19:11:13

Hi folks, Has anyone used MPL to make stick plots? If so, can I borrow your code? http://tabs.gerg.tamu.edu/Tglo/RTA/N/Oceanographic_CurrentStick_30.html Thanks, Chris  Christopher Barker, Ph.D. Oceanographer NOAA/OR&R/HAZMAT (206) 5266959 voice 7600 Sand Point Way NE (206) 5266329 fax Seattle, WA 98115 (206) 5266317 main reception 
From: Eric Firing <efiring@ha...>  20090506 20:10:22

Christopher Barker wrote: > Hi folks, > > Has anyone used MPL to make stick plots? If so, can I borrow your code? > > http://tabs.gerg.tamu.edu/Tglo/RTA/N/Oceanographic_CurrentStick_30.html > > Thanks, > > Chris > > > Chris, This would be a good addition. It might be implemented nicely by subclassing LineCollection, adding a set_transforms method something like that in EllipseCollection. Eric 
From: Eric Firing <efiring@ha...>  20090506 21:19:20

Christopher Barker wrote: > Hi folks, > > Has anyone used MPL to make stick plots? If so, can I borrow your code? > > http://tabs.gerg.tamu.edu/Tglo/RTA/N/Oceanographic_CurrentStick_30.html > > Thanks, > > Chris > > > Chris, If no one volunteers anything, then I suggest using quiver(..., headlength=0, headwidth=0, headaxislength=0), together with quiverkey(...). This will effectively give you a stick plot, with lots of flexibility. It could be implemented more efficiently in any of several ways, but it would take work to do it well. Eric 
From: Christopher Barker <Chris.B<arker@no...>  20090506 21:46:34

Eric Firing wrote: > Christopher Barker wrote: >> Has anyone used MPL to make stick plots? If so, can I borrow your code? > If no one volunteers anything, then I suggest using quiver(..., > headlength=0, headwidth=0, headaxislength=0), together with > quiverkey(...). This will effectively give you a stick plot, with lots > of flexibility. Thanks, I was thinking that quiver() would get direction wrong, as the x and y scales are in totally different units, but it looks like that's not the case if you use the "angles" keyword: angles: [‘uv’  ‘xy’  array] With the default ‘uv’, the arrow aspect ratio is 1, so that if U*==*V the angle of the arrow on the plot is 45 degrees CCW from the xaxis. With ‘xy’, the arrow points from (x,y) to (x+u, y+v). Alternatively, arbitrary angles may be specified as an array of values in degrees, CCW from the xaxis. > It could be implemented more efficiently in any of > several ways, but it would take work to do it well. I hope I'll get time to do that, but I don't really like quiver stick plots anyway. I prefer plots (that I don't know the name of) that: Time is on the x axis Magnitude of the velocity is the x axis At each data point, there is a dot, and the direction is given with a unitlength arrow originating at that dot, in the direction of the observation. I wrote a version of this a while back with the old MPL transforms mechanism, but haven't taken the time to translate it. Chris  Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 5266959 voice 7600 Sand Point Way NE (206) 5266329 fax Seattle, WA 98115 (206) 5266317 main reception Chris.Barker@... 
From: Gökhan SEVER <gokhansever@gm...>  20090506 23:52:56

Just for your information: Mayavi has a quiver3d function (http://code.enthought.com/projects/mayavi/docs/development/html/mayavi/auto/mlab_helper_functions.html#quiver3d) if you want to go a fancier way :) This said, I don't know how to hide arrow heads in Mayavi. Also what you showed in your original post seem a little like windbarbs, well except without notches. Gökhan On Wed, May 6, 2009 at 4:46 PM, Christopher Barker <Chris.Barker@...> wrote: > Eric Firing wrote: >> Christopher Barker wrote: >>> Has anyone used MPL to make stick plots? If so, can I borrow your code? >> If no one volunteers anything, then I suggest using quiver(..., >> headlength=0, headwidth=0, headaxislength=0), together with >> quiverkey(...). This will effectively give you a stick plot, with lots >> of flexibility. > > Thanks, I was thinking that quiver() would get direction wrong, as the x > and y scales are in totally different units, but it looks like that's > not the case if you use the "angles" keyword: > > angles: [‘uv’  ‘xy’  array] > With the default ‘uv’, the arrow aspect ratio is 1, so that if > U*==*V the angle of the arrow on the plot is 45 degrees CCW from the > xaxis. With ‘xy’, the arrow points from (x,y) to (x+u, y+v). > Alternatively, arbitrary angles may be specified as an array of values > in degrees, CCW from the xaxis. > > > It could be implemented more efficiently in any of >> several ways, but it would take work to do it well. > > I hope I'll get time to do that, but I don't really like quiver stick > plots anyway. I prefer plots (that I don't know the name of) that: > > > Time is on the x axis > > Magnitude of the velocity is the x axis > > At each data point, there is a dot, and the direction is given with a > unitlength arrow originating at that dot, in the direction of the > observation. > > I wrote a version of this a while back with the old MPL transforms > mechanism, but haven't taken the time to translate it. > > Chris > > > > >  > Christopher Barker, Ph.D. > Oceanographer > > Emergency Response Division > NOAA/NOS/OR&R (206) 5266959 voice > 7600 Sand Point Way NE (206) 5266329 fax > Seattle, WA 98115 (206) 5266317 main reception > > Chris.Barker@... > > >  > The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your > production scanning environment may not be a perfect world  but thanks to > Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700 > Series Scanner you'll get full speed at 300 dpi even with all image > processing features enabled. http://p.sf.net/sfu/kodakcom > _______________________________________________ > Matplotlibusers mailing list > Matplotlibusers@... > https://lists.sourceforge.net/lists/listinfo/matplotlibusers > 
From: Eric Firing <efiring@ha...>  20090506 22:30:30

Christopher Barker wrote: > Eric Firing wrote: >> Christopher Barker wrote: >>> Has anyone used MPL to make stick plots? If so, can I borrow your code? >> If no one volunteers anything, then I suggest using quiver(..., >> headlength=0, headwidth=0, headaxislength=0), together with >> quiverkey(...). This will effectively give you a stick plot, with lots >> of flexibility. > > Thanks, I was thinking that quiver() would get direction wrong, as the x > and y scales are in totally different units, but it looks like that's > not the case if you use the "angles" keyword: > > angles: [‘uv’  ‘xy’  array] > With the default ‘uv’, the arrow aspect ratio is 1, so that if > U*==*V the angle of the arrow on the plot is 45 degrees CCW from the > xaxis. With ‘xy’, the arrow points from (x,y) to (x+u, y+v). > Alternatively, arbitrary angles may be specified as an array of values > in degrees, CCW from the xaxis. > > > It could be implemented more efficiently in any of >> several ways, but it would take work to do it well. > > I hope I'll get time to do that, but I don't really like quiver stick > plots anyway. I prefer plots (that I don't know the name of) that: > > > Time is on the x axis > > Magnitude of the velocity is the x axis > > At each data point, there is a dot, and the direction is given with a > unitlength arrow originating at that dot, in the direction of the > observation. I think this would be straightforward, using an ordinary plot command plus quiver. Eric > > I wrote a version of this a while back with the old MPL transforms > mechanism, but haven't taken the time to translate it. > > Chris > > > > 
From: Christopher Barker <Chris.B<arker@no...>  20090507 00:10:52

Gökhan SEVER wrote: > Mayavi has a quiver3d function > (http://code.enthought.com/projects/mayavi/docs/development/html/mayavi/auto/mlab_helper_functions.html#quiver3d) > if you want to go a fancier way :) which is cool, but I"m looking to plot a time series of a (2d) vector quantity at a single point. > Also what > you showed in your original post seem a little like windbarbs, well > except without notches. yup  stick plots are commonly used for wind data. Chris > Gökhan > > > > On Wed, May 6, 2009 at 4:46 PM, Christopher Barker > <Chris.Barker@...> wrote: >> Eric Firing wrote: >>> Christopher Barker wrote: >>>> Has anyone used MPL to make stick plots? If so, can I borrow your code? >>> If no one volunteers anything, then I suggest using quiver(..., >>> headlength=0, headwidth=0, headaxislength=0), together with >>> quiverkey(...). This will effectively give you a stick plot, with lots >>> of flexibility. >> Thanks, I was thinking that quiver() would get direction wrong, as the x >> and y scales are in totally different units, but it looks like that's >> not the case if you use the "angles" keyword: >> >> angles: [‘uv’  ‘xy’  array] >> With the default ‘uv’, the arrow aspect ratio is 1, so that if >> U*==*V the angle of the arrow on the plot is 45 degrees CCW from the >> xaxis. With ‘xy’, the arrow points from (x,y) to (x+u, y+v). >> Alternatively, arbitrary angles may be specified as an array of values >> in degrees, CCW from the xaxis. >> >> > It could be implemented more efficiently in any of >>> several ways, but it would take work to do it well. >> I hope I'll get time to do that, but I don't really like quiver stick >> plots anyway. I prefer plots (that I don't know the name of) that: >> >> >> Time is on the x axis >> >> Magnitude of the velocity is the x axis >> >> At each data point, there is a dot, and the direction is given with a >> unitlength arrow originating at that dot, in the direction of the >> observation. >> >> I wrote a version of this a while back with the old MPL transforms >> mechanism, but haven't taken the time to translate it. >> >> Chris >> >> >> >> >>  >> Christopher Barker, Ph.D. >> Oceanographer >> >> Emergency Response Division >> NOAA/NOS/OR&R (206) 5266959 voice >> 7600 Sand Point Way NE (206) 5266329 fax >> Seattle, WA 98115 (206) 5266317 main reception >> >> Chris.Barker@... >> >> >>  >> The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your >> production scanning environment may not be a perfect world  but thanks to >> Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700 >> Series Scanner you'll get full speed at 300 dpi even with all image >> processing features enabled. http://p.sf.net/sfu/kodakcom >> _______________________________________________ >> Matplotlibusers mailing list >> Matplotlibusers@... >> https://lists.sourceforge.net/lists/listinfo/matplotlibusers >>  Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 5266959 voice 7600 Sand Point Way NE (206) 5266329 fax Seattle, WA 98115 (206) 5266317 main reception Chris.Barker@... 
From: Gökhan SEVER <gokhansever@gm...>  20090507 00:38:01

To me arrows are always useful to see the direction of wind easily. Since in meteorological convention barbs show where the wind is blowing from, but in pilot convention (I might have made up this one :)) in the opposite way. Gökhan On Wed, May 6, 2009 at 7:11 PM, Christopher Barker <Chris.Barker@...> wrote: > Gökhan SEVER wrote: >> Mayavi has a quiver3d function >> (http://code.enthought.com/projects/mayavi/docs/development/html/mayavi/auto/mlab_helper_functions.html#quiver3d) >> if you want to go a fancier way :) > > which is cool, but I"m looking to plot a time series of a (2d) vector > quantity at a single point. > >> Also what >> you showed in your original post seem a little like windbarbs, well >> except without notches. > > yup  stick plots are commonly used for wind data. > > Chris > > >> Gökhan >> >> >> >> On Wed, May 6, 2009 at 4:46 PM, Christopher Barker >> <Chris.Barker@...> wrote: >>> Eric Firing wrote: >>>> Christopher Barker wrote: >>>>> Has anyone used MPL to make stick plots? If so, can I borrow your code? >>>> If no one volunteers anything, then I suggest using quiver(..., >>>> headlength=0, headwidth=0, headaxislength=0), together with >>>> quiverkey(...). This will effectively give you a stick plot, with lots >>>> of flexibility. >>> Thanks, I was thinking that quiver() would get direction wrong, as the x >>> and y scales are in totally different units, but it looks like that's >>> not the case if you use the "angles" keyword: >>> >>> angles: [‘uv’  ‘xy’  array] >>> With the default ‘uv’, the arrow aspect ratio is 1, so that if >>> U*==*V the angle of the arrow on the plot is 45 degrees CCW from the >>> xaxis. With ‘xy’, the arrow points from (x,y) to (x+u, y+v). >>> Alternatively, arbitrary angles may be specified as an array of values >>> in degrees, CCW from the xaxis. >>> >>> > It could be implemented more efficiently in any of >>>> several ways, but it would take work to do it well. >>> I hope I'll get time to do that, but I don't really like quiver stick >>> plots anyway. I prefer plots (that I don't know the name of) that: >>> >>> >>> Time is on the x axis >>> >>> Magnitude of the velocity is the x axis >>> >>> At each data point, there is a dot, and the direction is given with a >>> unitlength arrow originating at that dot, in the direction of the >>> observation. >>> >>> I wrote a version of this a while back with the old MPL transforms >>> mechanism, but haven't taken the time to translate it. >>> >>> Chris >>> >>> >>> >>> >>>  >>> Christopher Barker, Ph.D. >>> Oceanographer >>> >>> Emergency Response Division >>> NOAA/NOS/OR&R (206) 5266959 voice >>> 7600 Sand Point Way NE (206) 5266329 fax >>> Seattle, WA 98115 (206) 5266317 main reception >>> >>> Chris.Barker@... >>> >>> >>>  >>> The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your >>> production scanning environment may not be a perfect world  but thanks to >>> Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700 >>> Series Scanner you'll get full speed at 300 dpi even with all image >>> processing features enabled. http://p.sf.net/sfu/kodakcom >>> _______________________________________________ >>> Matplotlibusers mailing list >>> Matplotlibusers@... >>> https://lists.sourceforge.net/lists/listinfo/matplotlibusers >>> > > >  > Christopher Barker, Ph.D. > Oceanographer > > Emergency Response Division > NOAA/NOS/OR&R (206) 5266959 voice > 7600 Sand Point Way NE (206) 5266329 fax > Seattle, WA 98115 (206) 5266317 main reception > > Chris.Barker@... > > >  > The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your > production scanning environment may not be a perfect world  but thanks to > Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700 > Series Scanner you'll get full speed at 300 dpi even with all image > processing features enabled. http://p.sf.net/sfu/kodakcom > _______________________________________________ > Matplotlibusers mailing list > Matplotlibusers@... > https://lists.sourceforge.net/lists/listinfo/matplotlibusers > 
From: Christopher Barker <Chris.B<arker@no...>  20090514 00:09:54
Attachments:
StickPlot.py

Eric Firing wrote: > Christopher Barker wrote: >> Has anyone used MPL to make stick plots? If so, can I borrow your code? > If no one volunteers anything, then I suggest using quiver(..., > headlength=0, headwidth=0, headaxislength=0), together with > quiverkey(...). This will effectively give you a stick plot, with lots > of flexibility. I've got a start enclosed. I'm having trouble with a few issues: 1) I'd like to be able to pass in datetime objects for the x axis, but that doesn't seem to be supported  is that a bug? (uncomment the datetime list comp to see the error) 2) I'm a little confused about what to put on the y axis  stick plots often use the y axis to provide a scale for the velocites, but I can't figure out what units I'd use there  quiver is scaling the "arrows", so I don't know what units they are in. 3) it seemed like I should be able to use angles=array to pass in the angles directly, but that didn't work for me. > It could be implemented more efficiently in any of > several ways, but it would take work to do it well. yup  and the whole LineCollection/transforms thing confuses me anyway... Any suggestions to improve this? Chris  Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 5266959 voice 7600 Sand Point Way NE (206) 5266329 fax Seattle, WA 98115 (206) 5266317 main reception Chris.Barker@... 