以编程方式设置数据提示?

时间:2015-04-26 19:07:03

标签: matlab plot matlab-figure

我需要能够以编程方式从x轴值数组列表中设置数据提示。例如,我创建一个数字并绘制我的数据。

figure;plot(t1,[filter(b,a,Gyro(:,2)),filter(b,a,Gyro(:,4))])

我有一组来自t1变量(时间)的时间戳值(例如[0.450, 0.854, 1.2343....]),我想在其中放置数据提示以标记数据中的某些事件。通过单击并保存数据行程,无需每次手动放置它们...如何将它们作为数组传递并通过matlab脚本以编程方式执行此操作?

2 个答案:

答案 0 :(得分:5)

您可以以编程方式添加matlab datatip并在一定程度上自定义它们。

下面的函数显示了如何添加一些数据提示,定位它们并自定义它们的显示:

demo_datatip

此演示的代码(将其保存在文件demo_datatip.m中并运行它以获取上图):

function h = demo_datatip

    %// basic sample curve
    npts = 600 ;
    x = linspace(0,4*pi,npts) ;
    y = sin(x) ;

    %// plot
    h.fig = figure ;
    h.ax = axes ;
    h.plot = plot(x,y) ;

    %// simulate some event times
    time_events = x([25 265 442]) ; %// events type 1 at index 25, 265 and 422

    %// define the target line for the new datatip
    hTarget = handle(h.plot);

    %// Add the datatip array
    h.dtip = add_datatips( time_events , hTarget ) ;


function hdtip = add_datatips( evt_times , hTarget )
    %// retrieve the datacursor manager
    cursorMode = datacursormode(gcf);
    set(cursorMode, 'UpdateFcn',@customDatatipFunction, 'NewDataCursorOnClick',false);

    xdata = get(hTarget,'XData') ;
    ydata = get(hTarget,'YData') ;

    %// add the datatip for each event
    for idt = 1:numel(evt_times)
        hdtip(idt) = cursorMode.createDatatip(hTarget) ;
        set(hdtip(idt), 'MarkerSize',5, 'MarkerFaceColor','none', ...
                  'MarkerEdgeColor','r', 'Marker','o', 'HitTest','off');

        %// move it into the right place
        idx = find( xdata == evt_times(idt) ) ;%// find the index of the corresponding time
        pos = [xdata(idx) , ydata(idx) ,1 ];
        update(hdtip(idt), pos);
    end

function output_txt = customDatatipFunction(~,evt)
    pos = get(evt,'Position');
    idx = get(evt,'DataIndex');
    output_txt = { ...
        '*** !! Event !! ***' , ...
        ['at Time : '  num2str(pos(1),4)] ...
        ['Value: '   , num2str(pos(2),8)] ...
        ['Data index: ',num2str(idx)] ...
                };

如果您需要删除数据提示,只需在其上设置{{1>}句柄(甚至一组句柄即可在组中删除它们)。< / p>

答案 1 :(得分:0)

以下是一个可能正在寻找的小例子:

time = 0:0.5:10;
values = rand(1,length(time));
datatip_index = [3 6]; % an 'event' occurs on the 3rd and 6th datapoint 
datatip_text = {'event1', 'event2'};

figure;
plot(time,values)
hold on
text(time(datatip_index), values(datatip_index), datatip_text)