Error using randi (first input must be a positive integer scalar value)

Question

Sukru Yavuz 2018-3-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/387048-error-using-randi-first-input-must-be-a-positive-integer-scalar-value

回答： Rik 2018-3-8

采纳的回答： Rik

在 MATLAB Online 中打开

veri = readtable ('gh.csv');

vericell = table2cell(veri);

ghcolumn = cell2mat(vericell(:,3));

veri.Class = discretize(veri{:, 3}, min(veri{:, 3}):20:max(veri{:, 3})+20);

vericell = table2cell(veri);

class = cell2mat(vericell(:,end));

for ii=1:51

    deneme{ii,:}=vericell (class==ii,:);
    deneme{ii,:}=cell2table(deneme{ii});
    for j = 4:15
        deneme{ii}{:,j};
        meanres(ii,j) = mean (deneme{ii}{:,j});
        stdres(ii,j) = std(deneme{ii}{:,j});
        maxres(ii,j) = max(deneme{ii}{:,j});
        minres(ii,j) = min(deneme{ii}{:,j});
    end
end
vericell = cell2table(vericell);
for cc = 4:15
    maxofcolumn(:,cc) = max(vericell{:,cc});
    minofcolumn(:,cc) = min(vericell{:,cc});
end

A = table2array(vericell(:,4:15));

for nn = 1:12
    randomfor(:,nn) = randi([max(A(:,nn)),min(A(:,nn))]); 
end

I am getting First input must be a positive scalar integer value IMAX, or two integer values [IMIN IMAX] with IMIN less than or equal to IMAX error while I am trying to get a random number for each column.

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Answer 1

Rik 2018-3-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/387048-error-using-randi-first-input-must-be-a-positive-integer-scalar-value#answer_308999

在 MATLAB Online 中打开

As the error message said, the values must be integers in increasing order. Your original code did not have the correct order, and apparently the values are not integers. You shouldn't convert them to strings, you should round them, but which method of rounding works for you is for you to decide. The code below is one example of how you can ensure you're using a valid syntax.

rand_range=[max(A(:,nn)),min(A(:,nn))];
rand_range=[ceil(rand_range(1)) floor(rand_range(2))];
%if rand_range=[0.1 0.8]; this rounds it to [1 0], so sort to make sure the order is correct
rand_range=sort(rand_range);
randomfor(:,nn) = randi(rand_range);