How to extract tick label in sequence data

I have irregular sequence data as：

2019/1/1 3:00:00, 1

2019/1/1 4:00:00, 2

2019/1/2 3:00:00, 3

2019/1/2 5:00:00, 4

2019/1/2 6:00:00, 5

2019/1/2 7:00:00, 6

2019/1/3 2:00:00, 7

2019/1/3 3:00:00, 8

2019/1/3 4:00:00, 9

2019/1/4 3:00:00, 10

2019/1/4 4:00:00, 11

2019/1/5 1:00:00, 12

2019/1/5 3:00:00, 13

and I want to extract the following tick labels and their position when I plot the data

position label

1 1/1

3 1/2

7 1/3

10 1/4

12 1/5

Answer 1

[Cris LaPierre]

What do you mean you want to extract them? Do you mean set them?

Look at the xticks and xticklabels functions.

x = linspace(0,10);
y = x.^2;
plot(x,y)
xticks([0 5 10])
xticklabels(["x = 0","x = 5","x = 10"])

●

[suling yin]

thanks for your reply

yes, I mean I want to set them

but the following are the my expected result

position label

1 1/1

3 1/2

7 1/3

10 1/4

12 1/5

In fact, I just want to find the first position of each day in my example data.

[Cris LaPierre]

In fact, I just want to find the first position of each day in my example data.

This would be good information to include in the orginal question.

data = readtable("datesVals.csv","Format",'%{yyyy/MM/dd HH:mm:ss}D %f')

data = 13x2 table
           Var1            Var2
    ___________________    ____

    2019/01/01 03:00:00      1 
    2019/01/01 04:00:00      2 
    2019/01/02 03:00:00      3 
    2019/01/02 05:00:00      4 
    2019/01/02 06:00:00      5 
    2019/01/02 07:00:00      6 
    2019/01/03 02:00:00      7 
    2019/01/03 03:00:00      8 
    2019/01/03 04:00:00      9 
    2019/01/04 03:00:00     10 
    2019/01/04 04:00:00     11 
    2019/01/05 01:00:00     12 
    2019/01/05 03:00:00     13 

tDays = groupsummary(data,"Var1","day",'min',"Var1")

tDays = 5x3 table
     day_Var1      GroupCount         min_Var1      
    ___________    __________    ___________________

    01-Jan-2019        2         2019/01/01 03:00:00
    02-Jan-2019        4         2019/01/02 03:00:00
    03-Jan-2019        3         2019/01/03 02:00:00
    04-Jan-2019        2         2019/01/04 03:00:00
    05-Jan-2019        2         2019/01/05 01:00:00

plot(data.Var1,data.Var2)
xticks(tDays.min_Var1);
xticklabels("1/" + num2str(day(tDays.min_Var1)))