While loop not working the way I thought

Question

Zach Harrison 2020-11-30

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/669698-while-loop-not-working-the-way-i-thought

评论： Zach Harrison 2020-11-30

%% Made by Zach Harrison, Final Project Part
clear all
clc
%% Code
i = 1;      % Initial parking spot number
n = 30;     % Number of parking spots 
spot = zeros(2,n);   % 0 means spot is open, 1 means spot is full
car = 1;    % Car number
    
while i <= n    % Check each parking spot
    for k = 1:n
       spot(k) = spot; 
    end
    
    if spot == 1
        continue
    elseif spot == 0    % Check if spot is open
        spot = 1;   % Make spot full
        text = ['car ', num2str(car),' entered into spot ', num2str(i)];
        disp(text)
    else
        disp('The parking lot is full')      
    end
    k = k + 1;
    i = i + 1;
        
end
    
car = car + 1;

I want the code to tell a car to park in the closest open parking spot. Code to English, If car comes in, check the first spot, if open go in, if full move on to the next spot and repeat. I could use a lot of ifelse statements but that is long a dirty, but I can't figure out how to make this work.

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Answer 1

Sibi 2020-11-30

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编辑：Sibi 2020-11-30

在 MATLAB Online 中打开

i = 1;      % Initial parking spot number
n = 30;     % Number of parking spots 
spot = zeros(1,n);   % 0 means spot is open, 1 means spot is full
car = 1;    % Car number
if sum(spot) < n    
    for k = 1:n
       if spot(1,k) == 1 % Check each parking spot
        continue
       else
        spot(1,k) = 1;   % Make spot full
        text = ['car ', num2str(car),' entered into spot ', num2str(k)];
        disp(text)
        break
       end
    end
else
        disp('The parking lot is full')      
end
car=car+1;

try this.

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Zach Harrison 2020-11-30

Ok, but this gives the same answer everytime. If another car comes in, it should go into spot 2. Could I put this code inside a while loop so the car changes to car = 2 for the next run?

Zach Harrison 2020-11-30

Update: I switched your if statement with a while loop and got rid of the else part, and moved the car = car + 1; into the while loop. This seems to work, thank you

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Answer 2

David Hill 2020-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/669698-while-loop-not-working-the-way-i-thought#answer_560763

在 MATLAB Online 中打开

spot=randi(2,1,20)-1;%I would keep it one dimensional (initial fill of parking spots)
fillorder=randperm(numel(spot));%make fill order as complex as you like
if isequal(nnz(spot),numel(spot))
     disp('The parking lot is full');
else
    nextspot=fillorder(find(spot(fillorder))==0,1);
    spot(nextspot)=1;
end