如何在R中指定日期的x轴值

Question

I want to figure out when exactly the number of calls sharply increased.

Here is my original code:

plot(breaks, cumfreq0, main="Cumulative percentage of calls happened in NOV.7th", xlab="time", ylab = "cumulative percentage of calls", sub = "(each dot represents a single period of time on Nov.7th)")

but I don't think the time scale on the x-axis is specific enough. How can I change it?

I tried some times as shown here but it seems that codes does fit time object.

Many many thanks for any help

Answer 1

Please see below, i just replicated your example with dummy data

> df
# A tibble: 55 x 2
   datetime             Freq
   <dttm>              <int>
 1 2018-11-01 12:41:57   215
 2 2018-11-01 12:41:58   163
 3 2018-11-01 12:47:06   225
 4 2018-11-01 12:51:00    69
 5 2018-11-01 12:57:37   203
 6 2018-11-01 12:57:38   248
 7 2018-11-01 12:57:38    58
 8 2018-11-01 13:29:15   179
 9 2018-11-01 13:37:45   233
10 2018-11-01 14:24:43   150
# ... with 45 more rows

And the code to kind of plot you are expecting with x-axis as timestamp and you can give whichever format you want

plot(df$datetime,df$Freq,xaxt="n")
axis.POSIXct(1, at=df$datetime, labels=format(df$datetime, "%m/%d/%Y %H:%M:%S"))

Answer 2

Thanks to Sai Prabhanjan, here is my current code and plot!

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