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 2016-10-18

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评论： Ullas Rajvanshi 2016-10-18

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?

Thanks in advance

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Answer 1

Matthew Eicholtz 2016-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/307896-plotting-the-data-if-all-the-data-point-is-to-be-represented-by-a-vertical-bar-from-the-x-axis-y-0#answer_239586

在 MATLAB Online 中打开

y = randi(10,1,10); % generate random data
figure;
hold on;
for ii=1:length(y)
  plot([ii ii],[0 y(ii)],'b');
end

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Ullas Rajvanshi 2016-10-18

Thank you!

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Answer 2

Matthew Eicholtz 2016-10-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/307896-plotting-the-data-if-all-the-data-point-is-to-be-represented-by-a-vertical-bar-from-the-x-axis-y-0#answer_239580

在 MATLAB Online 中打开

bar(y);

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Ullas Rajvanshi 2016-10-18

Thats what I thought but its not the correct answer. You have to use loops to solve this! Thanks

Matthew Eicholtz 2016-10-18

Is this homework? Why do you "have to use loops"?

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