Specify colour when using script ipvd.m

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Jenny
Jenny 2016 年 5 月 10 日
回答済み: Matt Cohen 2016 年 5 月 16 日
I am using the code attached (ipvd.m) to generate a progressive vector diagram for different data sets on the same figure.
How can I specify the colour of the line automatically (rather than using the plot editor manually) ?
My code calls the ipvd.m as follows:
figure
ipvd(uCurr5m/1000,vCurr5m/1000);
hold on;
ipvd(uCurr15m/1000,vCurr15m/1000);
ipvd(uCurrspred/1000,vCurrspred/1000);
ipvd(uCurrbunn/1000,vCurrbunn/1000);
I tried the following (which did not work)
p = ipvd(uCurr5m/1000,vCurr5m/1000);
set(p,'color','r');
Any help would be greatly appreciated.
Jenny

回答 (1 件)

Matt Cohen
Matt Cohen 2016 年 5 月 16 日
Hi Jenny,
I understand that you are interested in automatically specifying and modifying the color of the line in the plot generated by the function "ipvd.m".
You can accomplish this task by making a minor modification to the function's code. In the last line of code in "ipvd.m", you should return the handle to the quiver object, as follows:
q = quiver(posX(1:n),posY(1:n),vx(:),vy(:),0);
Right now, this function does not appear to return any variables, even though you are treating it like it is. You should output this quiver object from the function:
function q = ipvd(vx,vy,xo,yo)
Just like other graphics objects in MATLAB, you can modify various property values through the quiver's handle. I have included a documentation link that provides information about the quiver series properties.
For example, the following code modifies the color of the quiver's line:
q = ipvd(1:10, 1:10);
q.Color = 'green'; % One syntax for modifying color
set(q,'Color','red'); % Another syntax
I hope this helps.
Matt

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