Construct the histogram with unix time on X-axis

Newbie
1

I have a same data set with the unix time and its corresponding data
EX.
Unix time stamp Data
1638338401- 43
1638338432- 23
1638338461- 24

I want to produce the 2D histogram with UNIX time on X-axis and Data set on Y-axis.

Thank You so much.

2

https://root.cern/doc/master/timeonaxis2_8C.html

3

I am trying to add unix time on X-axis instead of date,
also I didn’t understand the use of
‘’'noise=f.Gaus(0.5*(X1+X2), 0.1*(X2-X1))

for(Int_t f = 0; f < nEntries; f++) //loop over to fill the histogram
{
    currentAna->GetEntry(f);
    //Double_t noise = f.Gaus(0.5*(X1+X2), 0.1*(X2-X1))
    curr_vals->Fill(abs(Curr));
}

‘’'void Histogram()

TDatime T0(2021, 12, 1, 0, 0, 0);
int X0 = T0.Convert();
gStyle->SetTimeOffset(X0);
TDatime T1(2021, 12, 01, 0, 0, 0);
int X1 = T1.Convert()-X0;
TDatime T2(2021, 12, 30, 0, 0, 0);
int X2 = T2.Convert(1)-X0;

‘’’

4

What do you call “unix time” ? if that’s the number of seconds since 1970 (the standard definition) you can just use an integer. No need for a time axis.

5

Thank You,
I tried but it changes the unix time to notation. I tried decreasing the X-axis label size but it didn’t worked.
Is there any way to include the unix time?

6

Unix time is seconds, that’s an integer how can the “unix time notation” be changed ? it is just integers. Do you have an example showing what is wrong ?

7

my range is from

    TH2F *hist = new TH2F("hist", "Current vs Time", 100, 1638338399000,1635742801000, 80, 20, 200);

But my Plot show as
Screen Shot 2022-04-29 at 1.22.22 AM

8

The order of you X limit is wrong. It should be:

 TH2D *hist = new TH2D("hist", "Current vs Time", 100, 1635742801000, 1638338399000, 80, 20, 200);

The value you entered are bigger than the largest integer authorised in C++. try to google “largest integer C++” . I suggest you apply an offset (substrate some fixed value) to reduce the range.