tasks a-s

Task/Queue-Definition/MATLAB/queue-definition-1.m

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+myfifo = {};
+
+% push
+myfifo{end+1} = x;
+
+% pop
+x = myfifo{1};  myfifo{1} = [];
+
+% empty
+isempty(myfifo)

Task/Queue-Definition/MATLAB/queue-definition-2.m

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+%This class impliments a standard FIFO queue.
+classdef FIFOQueue
+
+    properties
+        queue
+    end
+
+    methods
+
+        %Class constructor
+        function theQueue = FIFOQueue(varargin)
+
+            if isempty(varargin) %No input arguments
+
+                %Initialize the queue state as empty
+                theQueue.queue = {};
+            elseif (numel(varargin) > 1) %More than 1 input arg
+
+                %Make the queue the list of input args
+                theQueue.queue = varargin;
+            elseif iscell(varargin{:}) %If the only input is a cell array
+
+                %Make the contents of the cell array the elements in the queue
+                theQueue.queue = varargin{:};
+            else %There is one input argument that is not a cell
+
+                %Make that one arg the only element in the queue
+                theQueue.queue = varargin;
+            end
+
+        end
+
+        %push() - pushes a new element to the end of the queue
+        function push(theQueue,varargin)
+
+            if isempty(varargin)
+                theQueue.queue(end+1) = {[]};
+            elseif (numel(varargin) > 1) %More than 1 input arg
+
+                %Make the queue the list of input args
+                theQueue.queue( end+1:end+numel(varargin) ) = varargin;
+            elseif iscell(varargin{:}) %If the only input is a cell array
+
+                %Make the contents of the cell array the elements in the queue
+                theQueue.queue( end+1:end+numel(varargin{:}) ) = varargin{:};
+            else %There is one input argument that is not a cell
+
+                %Make that one arg the only element in the queue
+                theQueue.queue{end+1} = varargin{:};
+            end
+
+            %Makes changes to the queue permanent
+            assignin('caller',inputname(1),theQueue);
+
+        end
+
+        %pop() - pops the first element off the queue
+        function element = pop(theQueue)
+
+            if empty(theQueue)
+                error 'The queue is empty'
+            else
+                %Returns the first element in the queue
+                element = theQueue.queue{1};
+
+                %Removes the first element from the queue
+                theQueue.queue(1) = [];
+
+                %Makes changes to the queue permanent
+                assignin('caller',inputname(1),theQueue);
+            end
+        end
+
+        %empty() - Returns true if the queue is empty
+        function trueFalse = empty(theQueue)
+
+            trueFalse = isempty(theQueue.queue);
+
+        end
+
+    end %methods
+end

Task/Queue-Definition/MATLAB/queue-definition-3.m

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+>> myQueue = FIFOQueue({'hello'})
+
+myQueue =
+
+	FIFOQueue
+
+>> push(myQueue,'jello')
+>> pop(myQueue)
+
+ans =
+
+hello
+
+>> pop(myQueue)
+
+ans =
+
+jello
+
+>> pop(myQueue)
+??? Error using ==> FIFOQueue.FIFOQueue>FIFOQueue.pop at 61
+The queue is empty