| Julian time problem [message #51492] |
Fri, 24 November 2006 03:16 |
corinnefrey
Messages: 18
Registered: November 2006
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Junior Member |
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Hi,
I have following probem:
First I define two times in the Julian system:
jul_time1=JULDAY(11,5,2006,10,10)
jul_time2=JULDAY(11,5,2006,10,20)
Then I make a time array which starts at the first time given above
time_array= TIMEGEN(30,units="minutes", START=jul_time1)
The second time is only 10 minutes after the first time, so I should be
able to find it in the generated time array.
When I print, I get following thing:
IDL> print,time_array(10),format='(d20.5)'
2454044.93056
IDL> print,jul_time2,format='(d20.5)'
2454044.93056
That seems to be ok! But if I make the difference then I don't get
zero:
IDL> print,time_array(10)-jul_time2
4.6566129e-010
What happend here? The jul_time2 and the time_array are both in DOUBLE
format.
IDL> help,jul_time2
JUL_TIME2 DOUBLE = 2454044.9
IDL> help,time_array
TIME_ARRAY DOUBLE = Array[30]
I need to have both numbers the same, so that I can search in the time
string for a desired time or date.
Thanks for your help,
corinne
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