How do I turn off arrowhead using quiverm (Mapping Toolbox)

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Mark Brandon
Mark Brandon 2022-11-2
编辑： Mark Brandon 2022-11-4
I am trying to get quiverm (part of the Mapping Toolbox) to plot lines, without arrowheads. This option is available for quiver, but it is not clear if it can be done with quiverm.
  1 个评论
Mark Brandon
Mark Brandon 2022-11-4
编辑：Mark Brandon 2022-11-4
Thanks for Walter Robertson and Maik for very useful suggestions.
I am now using a slightly simplier approach, as illustrated by the following example;
hQ = quiverm(lat,lon,dlat,dlon);
delete(hQ(1)); % removes arrow line
delete(hQ(2)); % removes arrowhead
Best,
Mark
p.s. Matlab: PLEASE add this information to the description of the quiverm function.

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采纳的回答

Walter Roberson
Walter Roberson 2022-11-2
编辑：Walter Roberson 2022-11-4
If I read the code correctly, then if you pass a marker specification to quiverm as part of the linespec (expected to be the fifth parameter, after x y u v) then it will not draw arrows, and will instead draw the symbol at the appropriate locations. All of the symbols will be drawn in a single call, with nan having been inserted between the coordinates, and with the line portion of the linespec having been turned off. The handle to that line that draws markers will be returned as the last of the handles returned by quiverm.
So... you could take that last handle and delete() the line.
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Mark Brandon
Mark Brandon 2022-11-4
Thanks for the useful answer. It would help if the Matlab documentation for quiverm included an explaination about the function of the two line handles returned for each vector.

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Maik
Maik 2022-11-2
Ran in:
You could change the marker shape and then delete it using findobj.
%% Sample Data From Mathworks Help Page
load("wind","x","y","u","v")
lat = y(11:22,11:22,1);
lon = x(11:22,11:22,1);
dlat = v(11:22,11:22,1);
dlon = u(11:22,11:22,1);
figure
[latlim,lonlim] = geoquadline(lat,lon);
usamap(latlim,lonlim)
%% With the Arrows
quiverm(lat,lon,dlat,dlon)
figure
[latlim,lonlim] = geoquadline(lat,lon);
usamap(latlim,lonlim)
%% Without The Arrows
quiverm(lat,lon,dlat,dlon,'-b+')
delete(findobj(gca, 'Marker', '+'))

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