selecting region of plot for calculations

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ALDO 2020-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/585539-selecting-region-of-plot-for-calculations

评论： ALDO 2020-9-8

Hi

I have a signal 24 hours long. I would like to plot the signal over time sampling rate 0.97samples/sec. then select a region on that plot, have that selected region show as a sub plot. then i can press a button and do the calculations i want on it(min max,slope of decline,...) and show the results in a box next to the graph. If a new region of the original plot is selected it will erase the prevoius subplot and calculations with the new slected region and allow for new calculation. I would appriciate and input on this. I tried making a gui a few times and it gets confussing after a point and i get stuck. Thank you in advance for your help!

please let me know if further explanation is needed.

y data range 50:100

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Mario Malic 2020-8-28

编辑：Mario Malic 2020-9-3

aldo.mlapp

Sorry, I have mistaken on these callbacks, actually, for UIAxes mentioned callback does not exist. EDIT2: Actually there are, I must have looked on wrong place for properties. see Ayush's answer below.

I hope you have access to App Designer, I made a small example to get you started.

You can use a slider property of MinorTicks to set it accordingly to sampling rate values, or you can use integers as well. These sliders change the X limits of the plot, so once you are happy with the selected region you can get XMin, XMax values, and Y (XMin:XMax) and do the calculations in the function.

Add a few components of Edit field (numeric) that will obtain the results(properties) from the function.

And lastly, make a button that will call the function.

Edit: I didn't read the question correctly. You have a vector with ~90000 elements, In such case, you can try adding another way of controling XLim: Maybe 3 sliders for seconds, minutes and hours, or (a) Numeric Field(s).

Do few examples that are on the starting screen, they are really helpful.

ALDO 2020-9-3

samplefile.m

Thank you so much for your comment. I have been trying to work on building an app. I am able to make the elements but I cant make them respond to what i need to be done. I will explain what the app is seposed to do I would really appriciate any help on this because I am not able to imrove my code no matter how much i try.

0) I am able to load my data but its very slow due to the data size

1) I have ploted the data in 4 sub plots with linked axes

2) the axes shows only the first 15 minutes of the data set

3) I want to add a slider to scroll all 4 subplots silmuntaniously to reach the end of xaxis time scale

4) I added the option to adjust the display range according to the time range selection from the provided list, but when each option is selcted the change does not reflect on the graph

5) then the goal is to do calculations on the visible axes ( i think adding the option do have a user click the desired range would be too complex for my skillset right now)

this is my first time using a gui/app designer so I am confused where the problem is and how to make everything user friendly and fast.

I have attached the code i have so far. thanks again for all you help. I really need to get this to work so i can view my files as soon as possible. I appriciate any help on this. best,

Mario Malic 2020-9-5

编辑：Mario Malic 2020-9-5

Aldo1.mlapp

In case you decide for the App Designer, here's a small start.

I somehow managed to get the x and y values of plots, see the windows button up/down callback. It's not so far from what you want to do.

ALDO 2020-9-8

Hi Mario Thank you for taking the time to make the layout for the app designer, I really appriate your help and input. I will try to see if I can work using this. All the best!

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Answer 1

Ayush Bansal 2020-9-3

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/585539-selecting-region-of-plot-for-calculations#answer_488950

WindowButtonDown callback function is triggered when mouse button is clicked. Get the current position (i.e. (x,y)) of the pointer using CurrentPoint property of the axes to obtain the starting point of the region. Find the index (i.e. Istart) of the x using find function.
WindowButtonUp callback function is triggered when mouse button is released and get the index (i.e. Iend) of the end point of the region as stated above.
In the WindowButtonUp function to add new subplot change the initial plot to subplot using using UIaxes=subplot(m,n,p1,UIaxes) where UIaxes is name of the first axes. Then use ax2=subplot (m, n, p2) to add another subplot. Plot on the ax2 for the new data using plot (ax2, x(Istart:Iend), y(Istart:Iend)). Add button in the figure for the calculations.
Use Slider ValueChangedFcn callback, triggered when slider is changed and get the Value property of slider to get the value of slider. Change the XData and YData property of all the plots accordingly.
Add dropdown uicontrol and add a ValueChangedFcn callback function, change the XData, YData accordingly for all the plots.

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Ayush Bansal 2020-9-4

Interactive_Plot_take2.m

I have made the necessary changes. I have added four subplots, WindowButtonDown callback, WindowButtonUp callback and slider. Callbacks can be added programmatically.

ALDO 2020-9-4

Hi Ayush; Thank you so much for the time you took to correct the errors! I will try to go over every step and make sure to understand it fully. also If you have any suggested text for me to read to learn more about this it would be much appriciated. Thanks again for your help!

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selecting region of plot for calculations

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selecting region of plot for calculations

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