Histogram only returns one output.

I am trying to plot a histogram that shows the first digit of any generated number, but when I run the code, it only plots for the last output. For example, if I run the code and the last value for out is 5, the histogram will only plot the 5. Any suggestions?

rng('shuffle')

A = randperm(100,10)

for X = A;

Y = num2str(X)

out = str2num(Y(1))

for out = str2num(Y(1))

histogram(X,9)

end

end

Answer 1

[Image Analyst]

Try this:

rng('shuffle')
A = randperm(100, 10)

A = 1×10

83 10 44 41 4 62 96 45 33 39

theHistogram = zeros(1, 10);
for k = 1 : numel(A)
    strNumber = sprintf('%d', A(k));
    thisFirstNumber(k) = str2double(strNumber(1));
    theHistogram(thisFirstNumber(k) + 1) = theHistogram(thisFirstNumber(k) + 1) + 1;
end
% Show first digits in command window:
thisFirstNumber

thisFirstNumber = 1×10

8 1 4 4 4 6 9 4 3 3

% Plot the histogram.
bar(0:9, theHistogram);
xlabel('First Digit of Number')
ylabel('count')
grid on;

[Javid Miller]

Thank You!