returning an object handle from a function
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I am trying to return a function handle from a function. The code is shown below:
function drawHandle = drawXYZ(XYZ,drawHandle);
if isempty(drawHandle)
drawHandle = plot3(XYZ(1,:), XYZ(2,:), XYZ(3,:));
axis([-5,+5,-5,+5,-5,+5])
else
set (drawHandle, 'XData',XYZ(1,:),'YData', XYZ(2,:),'Zdata', XYZ(3,:));
end
I first enter the function with an empty drawHandle (drawXYZ(XYZ,[]). When the line drawHandle = plot3... I get the error that drawHandle is a double and Matlab can's assign a function handle to a double. If I just replace drawHandle with a new variable x the assignment works correctly but still won't allow me to assign drawHandle to x. The function is called from a simulink function block but I don't see why that would make any difference. Any suggestions would be greatly appreciated.
Thanks,
Andy Cruce
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Answers (3)
Walter Roberson
on 5 Aug 2019
Graphics objects cannot be Simulink signals, not unless that changed in r2019a.
You can double() a graphics object handle to get the old style numeric handle. You might need to handle() the double to use it for graphics.
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Adam
on 5 Aug 2019
Edited: Adam
on 5 Aug 2019
Try passing in
gobjects(0)
instead.
Yours works fine for me in Matlab, but maybe from simulink it is different and the type of a variable cannot be changed. [] is of type double, so assigning a handle to it requires a type change of the variable, which it may not like.
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