Dynamic data plotting

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skyimager
skyimager on 30 May 2012
How to do dynamic plotting of data. I am receiving data continuously from the serial port (data given by a sensor). Now i want to plot the data in my gui simultaneoulsy in real time. As and when data is coming the plot should get updated. I have spent hours on this but no output.
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Oleg Komarov
Oleg Komarov on 30 May 2012
Check the timer() and set() functions.
If you want more details you have to provide more: http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

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Answers (1)

Walter Roberson
Walter Roberson on 30 May 2012
Set up the serial port with BytesAvailableFcnCnt = 1, BytesAvailableMode = 'byte', and BytesAvailableFcn being a function that adds the character to the current plot.
This arrangement is likely to end up dropping characters, as the overhead of calling the plot function once per byte is likely going to be too high. You should reconsider your "real time" and "when data is coming" requirements, keeping in mind that your display probably cannot update more than 60 times per second (and possibly only 12 times per second if you are using an LCD display from one of the first several generations.)
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skyimager
skyimager on 30 May 2012
sir..thank you for ur answer. I want to update the data once every 2 secs. The problem is once the gui starts..the text box takes in only the first value. I have to click a refresh button in my gui to get the subsequent values. If only the values can be stored in an array which can then be plotted.
Walter Roberson
Walter Roberson on 30 May 2012
data_array = [data_array, newly_read_data];
Save that somewhere your plot routine can get at it, and trigger the plot routine. The plot routine should have a drawnow() to update the graphics.

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