# Plotting the data if all the data point is to be represented by a vertical bar from the x-axis (y=0) to the value of y for that point

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Ullas Rajvanshi on 18 Oct 2016
Commented: Ullas Rajvanshi on 18 Oct 2016
Hi Readers. I have a question regarding matlab. I dont know how to even approach this. Suppose we have a 1D array named y
- we can plot this array with the command plot(y) [this gives a continuous line]
- or with the command scatter(1:numel(y),y,'.') [this shows individual points]
The question is that - how would you plot the same data (y) if every data point is to be represented by a vertical bar from the x-axis (y=0) to the value of y for that point? Hint you will need a for-loop and you can use the index of the for-loop to define the x-position of the vertical bar. Note that each vertical bar can be defined by two points: the two ends on each side.
However I know you can use bar(y) but if you would combine different bar plots in one figure, the one could (partially) hide the other. Then it can sometimes be useful to go 'back to basics’ and draw lines ‘manually’ (i.e. with a basic function like plot() ). Any idea how to do this?

Matthew Eicholtz on 18 Oct 2016
y = randi(10,1,10); % generate random data
figure;
hold on;
for ii=1:length(y)
plot([ii ii],[0 y(ii)],'b');
end
Ullas Rajvanshi on 18 Oct 2016
Thank you!

Matthew Eicholtz on 18 Oct 2016
bar(y);
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Matthew Eicholtz on 18 Oct 2016
Is this homework? Why do you "have to use loops"?