counting and plotting elements in a vector

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Ahsan Khan
Ahsan Khan 2013-10-7
评论： Ahsan Khan 2013-10-8
hi there, i want to count the number of elements in a vector and plot it right away. ex: v = [2,3,2,4,5,6,5,6,7,] the out put should be plotted right away. so the a plot should be made whos x-axis extends from 1 - 10 (y depends on counts so doesnt matter) so for the first plot, since there are no 1s...no count(or 0) is plotted then that plot is held and the count of 2 is plotted so it will be one, then next is 3 - one again, next is 2 in the vector but now we have gone up to count two so two is plotted and so on. so basically i want to plot the counts as the loop is run through the vector and the plot is updated with each loop. any help would be appreciated. thanks

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回答（1 个）

Image Analyst
Image Analyst 2013-10-7
for k = 1 : length(v)
plot(k, v(1:k), 'bo-');
drawnow;
pause(0.5);
end
  1 个评论
Ahsan Khan
Ahsan Khan 2013-10-8
hi there, thanx 4 the reply but this isn't what i want. let me explain again. say i have a column vector: v = [1;4;5;1;5;1]. i want to plot this with x-axis being the numbers 1-5 and y-axis being the count of occurrence of the number.so the first plot will (1,1), cause 1 have only occurred once, then the next plot will be (4,1) cause 4 occurred once, then (5,1). the next plot now will be (1,2) cause now 1 has occurred twice, then the next plot will be (5,2) cause 5 have now occurred twice. then the next plot will be (1,3) cause now 1 has occurred three times. note that all the previous plots should be held and plotted as well. i have also attached an image illustrating the procedure, even though it shows six separate plots, all of it is actually happening on one
. please help. thanx in advance.

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