Why aren't the outcomes of class methods being applied to global variables:

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Alexander James
Alexander James 2020-5-2
评论： Alexander James 2020-5-3
I'm not sure why the outcomes of class methods are not being applied to global variables:
When I enter
clear(Forest_Road,shoot)
in the main script I do not receive any errors but I don't have any trees being removed from my "forest" here grouped as collection of shoot's in a non scaler array, I think this is by design (seperating class varaibles from global variables). I tried making the input argument a global variable in the class definition but it didn't affect the outcome, what am I missing?
classdef Road
% Creation of the class road
properties
x;
y;
c;
end
methods
% Constructer
function obj = Road(x,y,c)
% Construct an instance of road class
% Assign input properties
obj.x = x;
obj.y = y;
obj.c = c;
end
function chop_trees = clear(obj,shoot)
i=1;
j=1;
while j~=80
for j=1:80
dist = hypot([shoot(i).x] - obj.x(j), [shoot(i).y] - [obj.y(j) + obj.c]);
if any(dist < 2);
global shoot
shoot(i)=[];
end
end
i=i+1;
end
end
end
end

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回答（1 个）

Steven Lord
Steven Lord 2020-5-2
Your class is a value class rather than a handle class. See the description of the difference between those two types of object here.
  2 个评论
Alexander James
Alexander James 2020-5-3
Thank you fot the clarification, If I set my superclass Geometry < handle then my subclass Road should inherit those properties. However if type
clear(Forest_Road,Forest)
in my main script the number and execute the number of objects (trees) in my Forest still not decrease, I've checked the values calculated under dist and there objects (trees) closer than 2m
classdef Road < Geometry
% Creation of the class road
properties
c;
end
methods
% Constructer
function obj = Road(x,y,c)
% Construct an instance of road class
% Assign input properties
obj@Geometry(x,y);
obj.x = x;
obj.y = y;
obj.c = c;
end
function clear_trees = clear(obj,Forest)
i=1;
j=1;
global Forest
while j~=80
for j=1:80
dist = hypot([Forest(i).x] - obj.x(j), [Forest(i).y] - [obj.y(j) + obj.c])
if any(dist < 2);
Forest(i)=[];
end
end
i=i+1;
end
end
end
end

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