Matlab- draw date and duration diagram

１、 Draw date line chart

With x The axis creates a line chart for the date time value . then , Change the format of the scale label and x Axis range . establish t As a date sequence , establish y As random data . Use plot Function to draw vector graph .

t = datetime(2014,6,28) + calweeks(0:9);
y = rand(1,10);
plot(t,y);

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By default ,plot The position of the tick mark will be selected according to the data range . When zooming in and out of a drawing , The scale label will automatically adjust according to the coordinate axis range .

xlim(datetime(2014,[7 8],[12 23]))
xtickformat('dd-MMM-yyyy')

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Draw a duration timeline

With x The axis is the duration value to create a line graph . then , Change the format of the scale label and x Axis range .

establish t As 0 To 3 Seven linearly separated duration values between minutes . establish y As a random data vector . Plot data .

t = 0:seconds(30):minutes(3);
y = rand(1,7);
plot(t,y);

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see x Axis range . Because the duration scale label is in a single unit （ minute ） It means , Therefore, these ranges are stored in this unit .

xl = xlim
xl = 1x2 duration
    -4.5 sec   184.5 sec

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Change the format of the duration scale label , In order to display in the form of a digital timer containing multiple time units .

xtickformat('mm:ss')

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Look again x Axis range . Because the duration scale label is now expressed in multiple units , So these ranges are 24 Hours a day for storage .

xl = xlim
xl = 1x2 duration
   -00:04    03:04

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Plot a scatter chart with dates and durations

Use scatter or scatter3 The function creates a scatter chart with the date time or duration value as the input value . for example , establish x Scatter chart with axis as date value .

t = datetime('today') + caldays(1:100);
y = linspace(10,40,100) + 10*rand(1,100);
scatter(t,y)

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