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

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.

[Mark Brandon]

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.

Answer 1

[Walter Roberson]

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.

[Mark Brandon]

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.

Answer 2

[Maik]

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', '+'))

[Mark Brandon]

This answer is also very good. Thanks!!