Is it possible to modify the size of the arrow heads drawn by streamslice.m?

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John Toole 2021-8-31

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评论： John Toole 2021-9-6

采纳的回答： Salman Ahmed

I have 2-d arrays of x- and y-direction velocities (u,v). My code includes the line:

h=streamslice(u,v,7);

I would like the arrow heads that are drawn to be larger (and thus more visible).

I have only found suggestions for quiver, not streamslice.

Thanks

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Answer 1

Salman Ahmed 2021-9-3

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Hi John,

There is a difference between quiver and streamslice that quiver returns a Quiver object while streamslice returns a vector of handles to the line objects. These line objects represent lines and arrows in the figure. Like any line object, the arrow properties can be modified to change Color, LineWidth, etc. Have a look at the sample code to understand better:

load wind; 
s = numel(streamslice(x,y,z,u,v,w,[],[],5,'noarrows')); % number of lines only (no arrows) in streamslice
close all; % close the figure
ssobj=streamslice(x,y,z,u,v,w,[],[],5); % Open again with arrows
for i=s+1:numel(ssobj) % Iterate over the line objects pertaining to arrows 
    ssobj(i).LineWidth=2; % Adjust LineWidth to make arrows more visible.
end

You can try replacing your streamslice function in the above code snippet and adjust LineWidth value to suit the size of arrowhead you need.

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John Toole 2021-9-6

Thank you for the suggestion. This gets me 90% of what I was wanting to achieve. It would be a bit nicer if I could also control the size of the arrows in addition to how thick they are displayed. LineWidth=3 results in the arrows looking like equilateral triangles rather than arrows. LineWidth=2 is okay, but not best.

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