when output, matlab shows <missing>?

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越琪 吴
越琪 吴 2020-10-11
评论： Walter Roberson 2020-10-12
I wrote a recursive function to generate a car plate for each car
function plate=plates(n,plate)
if n<1
return
else
element=["1","2","3","4","5","6","7","8","9","0","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];
str1=element(randi([11,36]));
for i=1:5
str2=element(unidrnd(36));
str1=strcat(str1,str2);
end
plate(n)=str1;
plates(n-1,plate);
end
end
In my project, some of the cars are allowed to jump the red light, and I use an array 'jaywalk', whose original value is all 0, to record them:
if the car will jump the red light, jaywalk(1,i)=1;,i is the numerical order of the car
At the end of my project, I need to display the plate of the cars which jumpt the red light, n is the total number of cars
for i=1:n
if jaywalk(1,i)==1
disp(plate(i));
end
end
BUT when I run the code to the stage of displaying the car plates, matlab shows missing.
how can i solve the problem?
Any help will be appreciated! Thanks!
  1 个评论
越琪 吴
越琪 吴 2020-10-12
In my project, I use this to call out the function
plate=["0"];
plate=plates(n,plate);

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回答（1 个）

Walter Roberson
Walter Roberson 2020-10-11
plates(n-1,plate);
That is not an assignment statement.
  4 个评论
显示 2更早的评论
越琪 吴
越琪 吴 2020-10-12
yes, a car plate is composed of a letter and then 5 characters of letters or digits. I am going recursive because I need to generate a car plate for each of the n cars, I know this can be achieved by a loop, but recursion is demanded by my instructor. Thanks!
Walter Roberson
Walter Roberson 2020-10-12
I suggest that you read https://www.mathworks.com/matlabcentral/answers/579063-code-for-reverse-a-vector#comment_998227

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