Want to create a loop that gets 12 arbitrary numbers between 1-20 from the keyboard

Question

Sandra 2011-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/1048-want-to-create-a-loop-that-gets-12-arbitrary-numbers-between-1-20-from-the-keyboard

I want to create a function or just an m-file that reads 12 arbitrary numbers, from the keyboard to a vector one at a time. The numbers should be in the range 0-20.

This is what I did so far but it doesn't work.

c=zeros(1,12);

for i=1:12, c=input('Write 12 numers between 0-20: ','s'); %I don't necesarely want it to ask everytime but I dont know how to make it ask one time. c(i+1)=c;

%if x>=20 (to get an error message if you type in the wrong number) %p='Error'; %p %end

end

Hope somebody can help!

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Answer 1

Oleg Komarov 2011-2-8

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An example of code, you can make more robust introducing more checks:

% Preallocate
c = zeros(12,1);
% Set counter
ii = 1;
while ii <= 12
    % Get value
    c(ii) = input('Write 12 numers between 0-20: ');
    % Check if in [0-20] 
    if ismembc(c(ii),0:20)
        ii = ii+1;
    else
        fprintf('\nWARNING: Only values between 0-20!\n')
    end
end

Oleg

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Oleg Komarov 2011-2-9

Ismembc is a mex helper in ismember. Much faster in case your input is sorted.

j dr 2011-4-11

I see !

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Answer 2

j dr 2011-2-8

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you're using "c" as your input vector but then you're not filling it, you're redefining it

 c=zeros(1,12);
for i=1:12, 
    c(i)=str2num(input('Write 12 numers between 0-20: ','s'));
    if c(i)>20 || c(i)<0
        error('You have to specify a number between [0-20], now start over')
    end
end
disp(c)