| Re: reading data into structs (was (no subject)) [message #4827] |
Tue, 08 August 1995 00:00 |
Sereno A. Barr-Kumara
Messages: 7
Registered: August 1995
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Junior Member |
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> Pearson J E <jepear@essex.ac.uk> wrote:
>> A small problem I am having in pvwave.
>>
>> How do you read in values from data files into structs?
>>
>> Any help would be appreciated.
>
Say you have some data
Lat Lon Height
10 10 50
10 10 60
etc 10 lines of data.
Define your stucture as a line
tmp = oneline{lat:0, lon:0, height:0} ; all intger values
;replicate the line for the number of data points create an
;array of structures
data = replicate(tmp,10)
;you can now readin the data in one line
line=''
opeenr, unit1, 'filein', /get_lun
readf, unit1, line ; need to get rid of headers
readf, unit1, data
close, unit1
;you can now access the data eg single line at a time etc
y = data(i).lon
or to fit some criteria of lat
x = data(where (lat gt 20)).height
Sometimes you need to define the structure as in a length wise
manner. (easier for certain types of manipulation).
Then you would need to read each in sequentially
and assign to the variable.
eg; you have a single lat lon followed by 10 height measure,ments
and 12 sets of these
tmp = oneset {lat:0, lon:0, heights:fltarr(10)}
data = replicate(tmp,12)
to read in
dummy =fltarr(10)
for i=0, 11 do begin
readf, unitx, lat, lon
data(i).lat =lat
data(i).lon =lon
readf, unitx, dummy
data(i).heights=dummy
endfor
hope this helps
Regards
barr-kum
____________________________________________________________ ________
| Sereno A. Barr-Kumarakulasinghe | sbarrkum@ic.sunysb.edu |
| Marine Sciences Research Center | |
| State University of New York | |
| Stony Brook, NY 11794-5000 | |
|___________________________________________________________ ________ |
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